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Chapter 2 Wiring and Protection
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250.94
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Communications system bonding conductor terminations shall be connected in accordance with 250.94(A) or (B). [250.94](https://2023.antflix.net#250.94)
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https://2023.antflix.net#250.94
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Chapter 2 Wiring and Protection
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250.94(A)
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An intersystem bonding termination (IBT) for connecting intersystem bonding conductors shall be provided external to enclosures at the service equipment or metering equipment enclosure and at the disconnecting means for any buildings or structures that are supplied by a feeder or branch circuit. If an IBT is used, it shall comply with the following: Be accessible for connection and inspectionConsist of a set of terminals with the capacity for connection of not less than three intersystem bonding conductorsNot interfere with opening the enclosure for a service, building or structure disconnecting means, or metering equipmentBe securely mounted as follows:At the service equipment, to a metal enclosure for the service equipment, to a metal meter enclosure, or to an exposed nonflexible metal service raceway, or be connected to the metal enclosure for the grounding electrode conductor with a minimum 6 AWG copper conductorAt the disconnecting means for a building or structure that is supplied by a feeder or branch circuit, be electrically connected to the metal enclosure for the building or structure disconnecting means, or be connected to the metal enclosure for the grounding electrode conductor with a minimum 6 AWG copper conductorBe listed as grounding and bonding equipmentException: In existing buildings or structures, if any of the intersystem bonding and grounding electrode conductors required by 770.100(B)(2), 800.100(B)(2), 810.21(F)(2), and 820.100 exist, installation of an IBT shall not be required. An accessible means external to enclosures for connecting intersystem bonding and grounding electrode conductors shall be permitted at the service equipment and at the disconnecting means for any buildings or structures that are supplied by a feeder or branch circuit by at least one of the following means:Exposed nonflexible metal racewaysAn exposed grounding electrode conductorApproved means for the external connection of a copper or other corrosion-resistant bonding or grounding electrode conductor to the grounded raceway or equipmentInformational Note: See 770.100, 800.100, 810.21, and 820.100 for intersystem bonding and grounding requirements for conductive optical fiber cables, communications circuits, radio and television equipment, CATV circuits, and network-powered broadband communications systems, respectively. [250.94(A)](https://2023.antflix.net#250.94(A))
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https://2023.antflix.net#250.94(A)
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Chapter 2 Wiring and Protection
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250.94(B)
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Connections to an aluminum or copper busbar not less than 6 mm thick × 50 mm wide (1/4 in. thick × 2 in. wide) and of a length to accommodate at least three terminations for communication systems in addition to other connections. The busbar shall be securely fastened and shall be installed in an accessible location. Connections shall be made by a listed connector. If aluminum busbars are used, the installation shall also comply with 250.64(A). The busbar shall be connected to the grounding electrode system by a conductor that is the larger of the following: The largest grounding electrode conductor that is connected to the busbarAs required or permitted in 250.94(A)Exception to (A) and (B): Means for connecting intersystem bonding conductors are not required if communications systems are not likely to be used in or on the building or structure.Informational Note: The use of an IBT can reduce electrical noise on communication systems. [250.94(B)](https://2023.antflix.net#250.94(B))
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https://2023.antflix.net#250.94(B)
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Chapter 2 Wiring and Protection
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250.96(A)
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Metal raceways, cable trays, cable armor, cable sheath, enclosures, frames, fittings, and other metal noncurrent-carrying parts that are to serve as equipment grounding conductors, with or without the use of wire-type supplementary equipment grounding conductors, shall be bonded if necessary to ensure electrical continuity and the capacity to conduct fault current likely to be imposed on them. Any nonconductive paint, enamel, or similar coating shall be removed at threads, contact points, and contact surfaces or shall be connected by means of fittings designed so as to make such removal unnecessary. [250.96(A)](https://2023.antflix.net#250.96(A))
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https://2023.antflix.net#250.96(A)
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Chapter 2 Wiring and Protection
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250.96(B)
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If installed for the reduction of electromagnetic interference on the grounding circuit, an equipment enclosure supplied by a branch circuit shall be permitted to be isolated from a raceway containing circuits supplying only that equipment by one or more listed nonmetallic raceway fittings located at the point of attachment of the raceway to the equipment enclosure. The metal raceway shall comply with this article and shall be supplemented by an internal insulated equipment grounding conductor installed in accordance with 250.146(D) to ground the equipment enclosure. Informational Note: Use of an isolated equipment grounding conductor does not relieve the requirement for grounding the raceway system. [250.96(B)](https://2023.antflix.net#250.96(B))
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https://2023.antflix.net#250.96(B)
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Chapter 2 Wiring and Protection
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250.97
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For circuits of over 250 volts to ground, the electrical continuity of metal raceways and cables with metal sheaths that contain any conductor other than service conductors shall be ensured by one or more of the methods specified for services in 250.92(B), except for (B)(1). Exception: If oversized, concentric, or eccentric knockouts are not encountered, or if a box or enclosure with concentric or eccentric knockouts is listed to provide a reliable bonding connection, the following methods shall be permitted: (1) Threadless couplings and connectors for cables with metal sheaths (2) Two locknuts, on rigid metal conduit or intermediate metal conduit, one inside and one outside of boxes and cabinets (3) Fittings with shoulders that seal tightly against the box or cabinet, such as electrical metallic tubing connectors, flexible metal conduit connectors, and cable connectors, with one locknut on the inside of boxes and cabinets (4) Listed fittings [250.97](https://2023.antflix.net#250.97)
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https://2023.antflix.net#250.97
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Chapter 2 Wiring and Protection
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250.98
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Expansion, expansion-deflection, or deflection fittings and telescoping sections of metal raceways shall be made electrically continuous by equipment bonding jumpers or other means. [250.98](https://2023.antflix.net#250.98)
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https://2023.antflix.net#250.98
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Chapter 2 Wiring and Protection
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250.100
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Regardless of the voltage of the electrical system, the electrical continuity of normally non-current-carrying metal parts of electrical equipment, raceways, metal-clad cable, and metal enclosures containing electrical equipment in any hazardous (classified) location, as defined in 500.5, 505.5, and 506.5, shall be ensured by any of the bonding methods specified in 250.92(B)(2) through (B)(4). One or more of these bonding methods shall be used whether or not equipment grounding conductors of the wire type are installed in the raceway or in a multiconductor cable assembly. Informational Note: See 501.30, 502.30, 503.30, 505.30, or 506.30 for specific bonding requirements. [250.100](https://2023.antflix.net#250.100)
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https://2023.antflix.net#250.100
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Chapter 2 Wiring and Protection
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250.102(A)
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Bonding jumpers shall be of copper, aluminum, copper-clad aluminum, or other corrosion-resistant material. A bonding jumper shall be a wire, bus, screw, or similar suitable conductor. [250.102(A)](https://2023.antflix.net#250.102(A))
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https://2023.antflix.net#250.102(A)
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Chapter 2 Wiring and Protection
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250.102(B)
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Bonding jumpers shall be attached in the manner specified in 250.8 for circuits and equipment and in 250.70 for grounding electrodes. [250.102(B)](https://2023.antflix.net#250.102(B))
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https://2023.antflix.net#250.102(B)
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Chapter 2 Wiring and Protection
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250.102(C)(1)
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The supply-side bonding jumper shall not be smaller than specified in Table 250.102(C)(1).Table 250.102(C)(1) Grounded Conductor, Main Bonding Jumper, System Bonding Jumper, and Supply-Side Bonding Jumper for Alternating-Current Systems Size of Largest Ungrounded Conductor or Equivalent Area for Parallel Conductors (AWG/kcmil) Size of Grounded Conductor or Bonding Jumper (AWG/kcmil) Copper Aluminum or Copper-Clad Aluminum Copper Aluminum or Copper-Clad Aluminum 2 or smaller 1/0 or smaller 8 6 1 or 1/0 2/0 or 3/0 6 4 2/0 or 3/0 4/0 or 250 4 2 Over 3/0 through 350 Over 250 through 500 2 1/0 Over 350 through 600 Over 500 through 900 1/0 3/0 Over 600 through 1100 Over 900 through 1750 2/0 4/0 Over 1100 Over 1750 See Notes 1 and 2. Notes:If the circular mil area of ungrounded supply conductors that are connected in parallel is larger than 1100 kcmil copper or 1750 kcmil aluminum, the grounded conductor or bonding jumper shall have an area not less than 121/2 percent of the area of the largest ungrounded supply conductor or equivalent area for parallel supply conductors. The grounded conductor or bonding jumper shall not be required to be larger than the largest ungrounded conductor or set of ungrounded conductors.If the circular mil area of ungrounded supply conductors that are connected in parallel is larger than 1100 kcmil copper or 1750 kcmil aluminum and if the ungrounded supply conductors and the bonding jumper are of different materials (copper, aluminum, or copper-clad aluminum), the minimum size of the grounded conductor or bonding jumper shall be based on the assumed use of ungrounded supply conductors of the same material as the grounded conductor or bonding jumper that has an ampacity equivalent to that of the installed ungrounded supply conductors.If there are no service-entrance conductors, the supply conductor size shall be determined by the equivalent size of the largest service-entrance conductor required for the load to be served. [250.102(C)(1)](https://2023.antflix.net#250.102(C)(1))
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https://2023.antflix.net#250.102(C)(1)
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Chapter 2 Wiring and Protection
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250.102(C)(2)
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If the ungrounded supply conductors are connected in parallel in two or more raceways or cables, the supply-side bonding jumper shall be sized in accordance with either of the following: An individual bonding jumper for each raceway or cable shall be selected from Table 250.102(C)(1) based on the size of the largest ungrounded supply conductor in each raceway or cable.A single bonding jumper installed for bonding two or more raceways or cables shall be sized in accordance with Table 250.102(C)(1) based on the sum of the circular mil areas of the largest ungrounded conductors from each set connected in parallel in each raceway or cable. The size of the grounded conductor(s) in each raceway or cable shall be based on the largest ungrounded conductor in each raceway or cable, or the sum of the circular mil areas of the largest ungrounded conductors from each set connected in parallel in each raceway or cable.Informational Note No. 1: The term supply conductors includes ungrounded conductors that do not have overcurrent protection on their supply side and terminate at service equipment or the first disconnecting means of a separately derived system.Informational Note No. 2: See Chapter 9, Table 8, for the circular mil area of conductors 18 AWG through 4/0 AWG. [250.102(C)(2)](https://2023.antflix.net#250.102(C)(2))
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https://2023.antflix.net#250.102(C)(2)
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Chapter 2 Wiring and Protection
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250.102(D)
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The equipment bonding jumper on the load side of an overcurrent device(s) shall be sized in accordance with 250.122. A single common continuous equipment bonding jumper shall be permitted to connect two or more raceways or cables if the bonding jumper is sized in accordance with 250.122 for the largest overcurrent device supplying circuits therein. [250.102(D)](https://2023.antflix.net#250.102(D))
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https://2023.antflix.net#250.102(D)
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Chapter 2 Wiring and Protection
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250.102(E)
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Bonding jumpers or conductors and equipment bonding jumpers shall be permitted to be installed inside or outside of a raceway or an enclosure. [250.102(E)](https://2023.antflix.net#250.102(E))
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https://2023.antflix.net#250.102(E)
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Chapter 2 Wiring and Protection
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250.102(E)(1)
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If installed inside a raceway, equipment bonding jumpers and bonding jumpers or conductors shall comply with the requirements of 250.119 and 250.148. [250.102(E)(1)](https://2023.antflix.net#250.102(E)(1))
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https://2023.antflix.net#250.102(E)(1)
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Chapter 2 Wiring and Protection
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250.102(E)(2)
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If installed on the outside, the length of the bonding jumper or conductor or equipment bonding jumper shall not exceed 1.8 m (6 ft) and shall be routed with the raceway or enclosure. Exception: An equipment bonding jumper or supply-side bonding jumper longer than 1.8 m (6 ft) shall be permitted at outside pole locations for the purpose of bonding or grounding isolated sections of metal raceways or elbows installed in exposed risers of metal conduit or other metal raceway, and for bonding grounding electrodes, and shall not be required to be routed with a raceway or enclosure. [250.102(E)(2)](https://2023.antflix.net#250.102(E)(2))
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https://2023.antflix.net#250.102(E)(2)
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Chapter 2 Wiring and Protection
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250.102(E)(3)
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Bonding jumpers or conductors and equipment bonding jumpers shall be installed in accordance with 250.64(A) and (B). [250.102(E)(3)](https://2023.antflix.net#250.102(E)(3))
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https://2023.antflix.net#250.102(E)(3)
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Chapter 2 Wiring and Protection
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250.104(A)
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The metal water piping system shall be bonded as required in 250.104(A)(1), (A)(2), or (A)(3). [250.104(A)](https://2023.antflix.net#250.104(A))
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https://2023.antflix.net#250.104(A)
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Chapter 2 Wiring and Protection
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250.104(A)(1)
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Metal water piping system(s) installed in or attached to a building or structure shall be bonded to any of the following: Service equipment enclosureGrounded conductor at the serviceGrounding electrode conductor, if of sufficient sizeOne or more grounding electrodes used, if the grounding electrode conductor or bonding jumper to the grounding electrode is of sufficient sizeThe bonding jumper(s) shall be installed in accordance with 250.64(A), (B), and (E). The points of attachment of the bonding jumper(s) shall be accessible. The bonding jumper(s) shall be sized in accordance with Table 250.102(C)(1) except that it shall not be required to be larger than 3/0 copper or 250 kcmil aluminum or copper-clad aluminum and except as permitted in 250.104(A)(2) and (A)(3). [250.104(A)(1)](https://2023.antflix.net#250.104(A)(1))
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https://2023.antflix.net#250.104(A)(1)
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Chapter 2 Wiring and Protection
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250.104(A)(2)
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In buildings of multiple occupancy where the metal water piping system(s) installed in or attached to a building or structure for the individual occupancies is metallically isolated from all other occupancies by use of nonmetallic water piping, the metal water piping system(s) for each occupancy shall be permitted to be bonded to the equipment grounding terminal of the switchgear, switchboard, or panelboard enclosure (other than service equipment) supplying that occupancy. The bonding jumper shall be sized in accordance with 250.102(D). [250.104(A)(2)](https://2023.antflix.net#250.104(A)(2))
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https://2023.antflix.net#250.104(A)(2)
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Chapter 2 Wiring and Protection
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250.104(A)(3)
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The metal water piping system(s) installed in or attached to a building or structure shall be bonded to any of the following: Building or structure disconnecting means enclosure where located at the building or structureEquipment grounding conductor run with the supply conductorsOne or more grounding electrodes usedThe bonding jumper(s) shall be sized in accordance with 250.102(D). The bonding jumper shall not be required to be larger than the largest ungrounded feeder or branch-circuit conductor supplying the building or structure. [250.104(A)(3)](https://2023.antflix.net#250.104(A)(3))
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https://2023.antflix.net#250.104(A)(3)
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Chapter 2 Wiring and Protection
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250.104(B)
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If installed in or attached to a building or structure, a metal piping system(s), including gas piping, that is likely to become energized shall be bonded to any of the following: Equipment grounding conductor for the circuit that is likely to energize the piping systemService equipment enclosureGrounded conductor at the serviceGrounding electrode conductor, if of sufficient sizeOne or more grounding electrodes used, if the grounding electrode conductor or bonding jumper to the grounding electrode is of sufficient sizeThe bonding conductor(s) or jumper(s) shall be sized in accordance with Table 250.122, and equipment grounding conductors shall be sized in accordance with Table 250.122 using the rating of the circuit that is likely to energize the piping system(s). The points of attachment of the bonding jumper(s) shall be accessible.Informational Note No. 1: Bonding all piping and metal air ducts within the premises will provide additional safety.Informational Note No. 2: See NFPA 54, National Fuel Gas Code, and NFPA 780, Standard for the Installation of Lightning Protection Systems, for information on gas piping systems. [250.104(B)](https://2023.antflix.net#250.104(B))
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https://2023.antflix.net#250.104(B)
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Chapter 2 Wiring and Protection
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250.104(C)
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Exposed structural metal that is interconnected to form a metal building frame, is not intentionally grounded or bonded, and is likely to become energized shall be bonded to any of the following: Service equipment enclosureGrounded conductor at the serviceDisconnecting means for buildings or structures supplied by a feeder or branch circuitGrounding electrode conductor, if not smaller than a conductor sized in accordance with Table 250.102(C)(1)One or more grounding electrodes used, if the grounding electrode conductor or bonding jumper to the grounding electrode is not smaller than a conductor sized in accordance with Table 250.102(C)(1)The bonding conductor(s) or jumper(s) shall be sized in accordance with Table 250.102(C)(1), except that it shall not be required to be larger than 3/0 AWG copper or 250 kcmil aluminum or copper-clad aluminum, and installed in accordance with 250.64(A), (B), and (E). The points of attachment of the bonding jumper(s) shall be accessible unless installed in compliance with 250.68(A), Exception No. 2. [250.104(C)](https://2023.antflix.net#250.104(C))
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https://2023.antflix.net#250.104(C)
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Chapter 2 Wiring and Protection
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250.104(D)
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Metal water piping systems and structural metal that is interconnected to form a building frame shall be bonded to separately derived systems in accordance with 250.104(D)(1) through (D)(3). [250.104(D)](https://2023.antflix.net#250.104(D))
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https://2023.antflix.net#250.104(D)
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Chapter 2 Wiring and Protection
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250.104(D)(1)
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The grounded conductor of each separately derived system shall be bonded to the nearest accessible point of the metal water piping system(s) in the area served by each separately derived system. This connection shall be made at the same point on the separately derived system where the grounding electrode conductor is connected. Each bonding jumper shall be sized in accordance with Table 250.102(C)(1) based on the largest ungrounded conductor of the separately derived system except that it shall not be required to be larger than 3/0 AWG copper or 250 kcmil aluminum or copper-clad aluminum. Exception No. 1: A separate bonding jumper to the metal water piping system shall not be required if the metal water piping system is used as the grounding electrode or grounding electrode conductor for the separately derived system and the connection to the water piping system is in the area served by the separately derived system. Exception No. 2: A separate bonding jumper to the metal water piping system shall not be required if the metal in-ground support structure is used as a grounding electrode or the metal frame of a building or structure is used as the grounding electrode conductor for a separately derived system and is bonded to the metal water piping system in the area served by the separately derived system. [250.104(D)(1)](https://2023.antflix.net#250.104(D)(1))
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https://2023.antflix.net#250.104(D)(1)
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Chapter 2 Wiring and Protection
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250.104(D)(2)
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If exposed structural metal that is interconnected to form the building frame exists in the area served by the separately derived system, it shall be bonded to the grounded conductor of each separately derived system. This connection shall be made at the same point on the separately derived system where the grounding electrode conductor is connected. Each bonding jumper shall be sized in accordance with Table 250.102(C)(1) based on the largest ungrounded conductor of the separately derived system except that it shall not be required to be larger than 3/0 AWG copper or 250 kcmil aluminum or copper-clad aluminum. Exception No. 1: A separate bonding jumper to the building structural metal shall not be required if the metal in-ground support structure is used as a grounding electrode or the metal frame of a building or structure is used as the grounding electrode conductor for the separately derived system. Exception No. 2: A separate bonding jumper to the building structural metal shall not be required if the water piping system of a building or structure is used as the grounding electrode or grounding electrode conductor for a separately derived system and is bonded to the building structural metal in the area served by the separately derived system. [250.104(D)(2)](https://2023.antflix.net#250.104(D)(2))
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https://2023.antflix.net#250.104(D)(2)
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Chapter 2 Wiring and Protection
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250.104(D)(3)
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If a common grounding electrode conductor is installed for multiple separately derived systems as permitted by 250.30(A)(6), and exposed structural metal that is interconnected to form the building frame or interior metal water piping exists in the area served by the separately derived system, the metal water piping and the structural metal member shall be bonded to the common grounding electrode conductor in the area served by the separately derived system. Exception: A separate bonding jumper from each derived system to metal water piping and to structural metal members shall not be required if the metal water piping and the structural metal members in the area served by the separately derived system are bonded to the common grounding electrode conductor. [250.104(D)(3)](https://2023.antflix.net#250.104(D)(3))
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https://2023.antflix.net#250.104(D)(3)
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Chapter 2 Wiring and Protection
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250.106
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The lightning protection system ground terminals shall be bonded to the building or structure grounding electrode system. Informational Note No. 1: See 250.60 for use of strike termination devices. Informational Note No. 2: See NFPA 780, Standard for the Installation of Lightning Protection Systems, which contains detailed information on grounding, bonding, and side-flash distance from lightning protection systems. [250.106](https://2023.antflix.net#250.106)
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https://2023.antflix.net#250.106
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Chapter 2 Wiring and Protection
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250.109
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Metal enclosures shall be permitted to be used to connect bonding jumpers or equipment grounding conductors, or both, together to become a part of an effective ground-fault current path. If installed, metal covers, plaster rings, extension rings, and metal fittings shall be attached to these metal enclosures to ensure an effective ground-fault current path or shall be connected with bonding jumpers or equipment grounding conductors, or both. Informational Note: See 250.97 for bonding requirements for over 250 volts to ground. [250.109](https://2023.antflix.net#250.109)
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https://2023.antflix.net#250.109
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Chapter 2 Wiring and Protection
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250.110
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Exposed, normally non-current-carrying metal parts of fixed equipment supplied by or enclosing conductors or components that are likely to become energized shall be connected to an equipment grounding conductor under any of the following conditions: If within 2.5 m (8 ft) vertically or 1.5 m (5 ft) horizontally of ground or grounded metal objects and subject to contact by personsIf located in a wet or damp location and not isolatedIf in electrical contact with metalIf in a hazardous (classified) locationIf supplied by a wiring method that provides an equipment grounding conductor, except as permitted by 250.86, Exception No. 2, for short sections of metal enclosuresIf equipment operates with any terminal at over 150 volts to groundException No. 1: If exempted by special permission, the metal frame of electrically heated appliances that have the frame permanently and effectively insulated from ground shall not be required to be grounded.Exception No. 2: Distribution apparatus, such as transformer and capacitor cases, mounted on wooden poles at a height exceeding 2.5 m (8 ft) above ground or grade level shall not be required to be grounded.Exception No. 3: Listed equipment protected by a system of double insulation, or its equivalent, shall not be required to be connected to the equipment grounding conductor. If such a system is employed, the equipment shall be distinctively marked. [250.110](https://2023.antflix.net#250.110)
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https://2023.antflix.net#250.110
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Chapter 2 Wiring and Protection
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250.112
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Except as permitted in 250.112(F) and (I), exposed, normally non-current-carrying metal parts of equipment described in 250.112(A) through (K), and normally non-current-carrying metal parts of equipment and enclosures described in 250.112(L) and (M), shall be connected to an equipment grounding conductor, regardless of voltage. [250.112](https://2023.antflix.net#250.112)
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https://2023.antflix.net#250.112
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Chapter 2 Wiring and Protection
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250.112(A)
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Switchgear or switchboard frames and structures supporting switching equipment, except frames of 2-wire dc switchgear or switchboards if effectively insulated from ground. [250.112(A)](https://2023.antflix.net#250.112(A))
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https://2023.antflix.net#250.112(A)
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Chapter 2 Wiring and Protection
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250.112(B)
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Generator and motor frames in an electrically operated pipe organ, unless effectively insulated from ground and the motor driving it. [250.112(B)](https://2023.antflix.net#250.112(B))
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https://2023.antflix.net#250.112(B)
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Chapter 2 Wiring and Protection
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250.112(C)
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Motor frames, as provided by 430.242. [250.112(C)](https://2023.antflix.net#250.112(C))
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https://2023.antflix.net#250.112(C)
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Chapter 2 Wiring and Protection
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250.112(D)
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Enclosures for motor controllers unless attached to ungrounded portable equipment. [250.112(D)](https://2023.antflix.net#250.112(D))
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https://2023.antflix.net#250.112(D)
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Chapter 2 Wiring and Protection
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250.112(E)
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Electrical equipment for elevators and cranes. [250.112(E)](https://2023.antflix.net#250.112(E))
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https://2023.antflix.net#250.112(E)
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Chapter 2 Wiring and Protection
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250.112(F)
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Electrical equipment in commercial garages, theaters, and motion picture studios, except pendant lampholders supplied by circuits not over 150 volts to ground. [250.112(F)](https://2023.antflix.net#250.112(F))
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https://2023.antflix.net#250.112(F)
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Chapter 2 Wiring and Protection
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250.112(G)
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Electric signs, outline lighting, and associated equipment as provided in 600.7. [250.112(G)](https://2023.antflix.net#250.112(G))
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https://2023.antflix.net#250.112(G)
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Chapter 2 Wiring and Protection
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250.112(H)
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Motion picture projection equipment. [250.112(H)](https://2023.antflix.net#250.112(H))
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https://2023.antflix.net#250.112(H)
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Chapter 2 Wiring and Protection
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250.112(I)
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Equipment supplied by Class 1 circuits shall be grounded unless operating at less than 50 volts. Equipment supplied by Class 1 power-limited circuits, by Class 2 and Class 3 remote-control and signaling circuits, and by fire alarm circuits shall be grounded if system grounding is required by Part II or Part VIII of this article. [250.112(I)](https://2023.antflix.net#250.112(I))
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https://2023.antflix.net#250.112(I)
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Chapter 2 Wiring and Protection
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250.112(J)
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Luminaires as provided in Part V of Article 410. [250.112(J)](https://2023.antflix.net#250.112(J))
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https://2023.antflix.net#250.112(J)
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Chapter 2 Wiring and Protection
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250.112(K)
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Permanently mounted electrical equipment and skids shall be connected to the equipment grounding conductor. Wire-type equipment grounding conductors shall be sized as required by 250.122. [250.112(K)](https://2023.antflix.net#250.112(K))
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https://2023.antflix.net#250.112(K)
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Chapter 2 Wiring and Protection
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250.112(L)
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Motor-operated water pumps, including the submersible type. [250.112(L)](https://2023.antflix.net#250.112(L))
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https://2023.antflix.net#250.112(L)
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Chapter 2 Wiring and Protection
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250.112(M)
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If a submersible pump is used in a metal well casing, the well casing shall be connected to the pump circuit equipment grounding conductor. [250.112(M)](https://2023.antflix.net#250.112(M))
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https://2023.antflix.net#250.112(M)
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Chapter 2 Wiring and Protection
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250.114
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Exposed, normally non-current-carrying metal parts of cord-and-plug-connected equipment shall be connected to the equipment grounding conductor under any of the following conditions: Exception: Listed tools, listed appliances, and listed equipment covered in 250.114, list items 2 through 4, shall not be required to be connected to an equipment grounding conductor if protected by a system of double insulation or its equivalent. Double-insulated equipment shall be distinctively marked.In hazardous (classified) locationsIf operated at over 150 volts to groundException No. 1 to (2): Motors, if guarded, shall not be required to be connected to an equipment grounding conductor.Exception No. 2 to (2): Metal frames of electrically healed appliances, exempted by special permission, shall not be required to be connected to an equipment grounding conductor, in which case the frames shall be permanently and effectively insulated from ground.In residential occupancies:Refrigerators, freezers, icemakers, and air conditionersClothes-washing, clothes-drying, and dish-washing machines; ranges; kitchen waste disposers; information technology equipment; sump pumps; and electrical aquarium equipmentHand-held motor-operated tools, stationary and fixed motor-operated tools, and light industrial motor-operated toolsMotor-operated appliances of the following types: hedge clippers, lawn mowers, snow blowers, and wet scrubbersPortable handlampsIn other than residential occupancies:Refrigerators, freezers, icemakers, and air conditionersClothes-washing, clothes-drying, and dish-washing machines; information technology equipment; sump pumps; and electrical aquarium equipmentHand-held motor-operated tools, stationary and fixed motor-operated tools, and light industrial motor-operated toolsMotor-operated appliances of the following types: hedge clippers, lawn mowers, snow blowers, and wet scrubbersPortable handlampsCord-and-plug-connected appliances used in damp or wet locations or by persons standing on the ground, standing on metal floors, or working inside of metal tanks or boilersTools likely to be used in wet or conductive locationsException: Tools and portable handlamps and portable luminaires likely to be used in wet or conductive locations shall not be required to be connected to an equipment grounding conductor if supplied through an isolating transformer with an ungrounded secondary of not over 50 volts. [250.114](https://2023.antflix.net#250.114)
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https://2023.antflix.net#250.114
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Chapter 2 Wiring and Protection
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250.116
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The metal parts of the following nonelectrical equipment described in this section shall be connected to the equipment grounding conductor: Frames and tracks of electrically operated cranes and hoistsFrames of nonelectrically driven elevator cars to which electrical conductors are attachedHand-operated metal shifting ropes or cables of electric elevatorsInformational Note: If extensive metal in or on buildings or structures may become energized and is subject to personal contact, adequate bonding and grounding will provide additional safety. [250.116](https://2023.antflix.net#250.116)
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https://2023.antflix.net#250.116
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Chapter 2 Wiring and Protection
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250.118(A)
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Each equipment grounding conductor run with or enclosing the circuit conductors shall be one or more or a combination of the following: A copper, aluminum, or copper-clad aluminum conductor. This conductor shall be solid or stranded; insulated, covered, or bare; and in the form of a wire or a busbar of any shape.Rigid metal conduit.Intermediate metal conduit.Electrical metallic tubing.Listed flexible metal conduit meeting all the following conditions:The conduit is terminated in listed fittings.The circuit conductors contained in the conduit are protected by overcurrent devices rated at 20 amperes or less.The size of the conduit does not exceed metric designator 35 (trade size 11/4).The combined length of flexible metal conduit, flexible metallic tubing, and liquidtight flexible metal conduit in the same effective ground-fault current path does not exceed 1.8 m (6 ft).If flexibility is necessary to minimize the transmission of vibration from equipment or to provide flexibility for equipment that requires movement after installation, a wire-type equipment grounding conductor or a bonding jumper in accordance with 250.102(E)(2) shall be installed.If flexible metal conduit is constructed of stainless steel, a wire-type equipment grounding conductor or bonding jumper in accordance with 250.102(E)(2) shall be installed.Listed liquidtight flexible metal conduit meeting all the following conditions:The conduit is terminated in listed fittings.For metric designators 12 through 16 (trade sizes 3/8 through 1/2), the circuit conductors contained in the conduit are protected by overcurrent devices rated at 20 amperes or less.For metric designators 21 through 35 (trade sizes 3/4 through 11/4), the circuit conductors contained in the conduit are protected by overcurrent devices rated not more than 60 amperes and there is no flexible metal conduit, flexible metallic tubing, or liquidtight flexible metal conduit in metric designators 12 through 16 (trade sizes 3/8 through 1/2) in the effective ground-fault current path.The combined length of flexible metal conduit, flexible metallic tubing, and liquidtight flexible metal conduit in the same effective ground-fault current path does not exceed 1.8 m (6 ft).If flexibility is necessary to minimize the transmission of vibration from equipment or to provide flexibility for equipment that requires movement after installation, a wire-type equipment grounding conductor or a bonding jumper in accordance with 250.102(E)(2) shall be installed.If liquidtight flexible metal conduit contains a stainless steel core, a wire-type equipment grounding conductor or a bonding jumper in accordance with 250.102(E)(2) shall be installed.Flexible metallic tubing if the tubing is terminated in listed fittings and meeting the following conditions:The circuit conductors contained in the tubing are protected by overcurrent devices rated at 20 amperes or less.The combined length of flexible metal conduit, flexible metallic tubing, and liquidtight flexible metal conduit in the same effective ground-fault current path does not exceed 1.8 m (6 ft).Armor of Type AC cable as provided in 320.108.The copper sheath of mineral-insulated, metal-sheathed cable Type MI.Type MC cable that provides an effective ground-fault current path in accordance with one or more of the following:It contains an insulated or uninsulated equipment grounding conductor in compliance with 250.118(1).The combined metallic sheath and uninsulated equipment grounding/bonding conductor of interlocked metal tape-type MC cable that is listed and identified as an equipment grounding conductorThe metallic sheath or the combined metallic sheath and equipment grounding conductors of the smooth or corrugated tube-type MC cable that is listed and identified as an equipment grounding conductorCable trays as permitted in 392.10 and 392.60.Cablebus framework as permitted in 370.60(1).Other listed electrically continuous metal raceways and listed auxiliary gutters.Surface metal raceways listed for grounding.Informational Note: See Article 100 for a definition of effective ground-fault current path. [250.118(A)](https://2023.antflix.net#250.118(A))
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https://2023.antflix.net#250.118(A)
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Chapter 2 Wiring and Protection
|
250.118(B)
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The following shall not be used as equipment grounding conductors. Grounding electrode conductorsException: A wire-type equipment grounding conductor installed in compliance with 250.6(A) and the applicable requirements for both the equipment grounding conductor and the grounding electrode conductor in Parts II. III, and VI of this article shall be permitted to serve as both an equipment grounding conductor and a grounding electrode conductor.Structural metal frame of a building or structure [250.118(B)](https://2023.antflix.net#250.118(B))
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https://2023.antflix.net#250.118(B)
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Chapter 2 Wiring and Protection
|
250.119(A)
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Unless required elsewhere in this Code, equipment grounding conductors shall be permitted to be bare, covered, or insulated. Individually covered or insulated equipment grounding conductors of the wire type shall have a continuous outer finish that is either green or green with one or more yellow stripes except as permitted in this section. Conductors with insulation or individual covering that is green, green with one or more yellow stripes, or otherwise identified as permitted by this section shall not be used for ungrounded or grounded circuit conductors. Exception No. 1: Power-limited Class 2 or Class 3 cables, power-limited fire alarm cables, or communications cables containing only circuits operating at less than 50 volts ac or 60 volts dc if connected to equipment not required to be grounded shall be permitted to use a conductor with green insulation or green with one or more yellow stripes for other than equipment grounding purposes. Exception No. 2: Flexible cords having an integral insulation and jacket without an equipment grounding conductor shall be permitted to have a continuous outer finish that is green. Informational Note: An example of a flexible cord with integral-type insulation is Type SPT-2, 2 conductor. Exception No. 3: Conductors with green insulation shall be permitted to be used as ungrounded signal conductors where installed between the output terminations of traffic signal control and traffic signal indicating heads. Signaling circuits installed in accordance with this exception shall include an equipment grounding conductor in accordance with 250.118. Wire-type equipment grounding conductors shall be bare or have insulation or covering that is green with one or more yellow stripes. [250.119(A)](https://2023.antflix.net#250.119(A))
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https://2023.antflix.net#250.119(A)
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Chapter 2 Wiring and Protection
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250.119(B)
|
Equipment grounding conductors 4 AWG and larger shall comply with the following: At the time of installation, if the insulation does not comply with 250.119(A), it shall be permanently identified as an equipment grounding conductor at each end and at every point where the conductor is accessible.Exception: Conductors 4 AWG and larger shall not be required to be marked in conduit bodies that contain no splices or unused hubs.Identification shall encircle the conductor and shall be accomplished by one of the following:Stripping the insulation or covering from the entire exposed lengthColoring the insulation or covering green at the terminationMarking the insulation or covering with green tape or green adhesive labels at the termination [250.119(B)](https://2023.antflix.net#250.119(B))
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https://2023.antflix.net#250.119(B)
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Chapter 2 Wiring and Protection
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250.119(C)
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One or more insulated conductors in a multiconductor cable, at the time of installation, shall be permitted to be permanently identified as equipment grounding conductors at each end and at every point where the conductors are accessible by one of the following means: Stripping the insulation from the entire exposed length.Coloring the exposed insulation green.Marking the exposed insulation with green tape or green adhesive labels. Identification shall encircle the conductor. [250.119(C)](https://2023.antflix.net#250.119(C))
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https://2023.antflix.net#250.119(C)
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Chapter 2 Wiring and Protection
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250.119(D)
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Equipment grounding conductors in flexible cords shall be insulated and shall have a continuous outer finish that is either green or green with one or more yellow stripes. [250.119(D)](https://2023.antflix.net#250.119(D))
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https://2023.antflix.net#250.119(D)
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Chapter 2 Wiring and Protection
|
250.120
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An equipment grounding conductor shall be installed in accordance with 250.120(A), (B), and (C). [250.120](https://2023.antflix.net#250.120)
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https://2023.antflix.net#250.120
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Chapter 2 Wiring and Protection
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250.120(A)
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If it consists of a raceway, cable tray, cable armor, cablebus framework, or cable sheath or if it is a wire within a raceway or cable, it shall be installed in accordance with the applicable provisions in this Code using fittings for joints and terminations approved for use with the type of raceway or cable used. All connections, joints, and fittings shall be made tight using suitable tools. Informational Note: See the UL Guide Information for Electrical Circuit Integrity Systems (FHIT) for equipment grounding conductors installed in a raceway that are part of a listed electrical circuit protective system or a listed fire-resistive cable system. [250.120(A)](https://2023.antflix.net#250.120(A))
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https://2023.antflix.net#250.120(A)
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Chapter 2 Wiring and Protection
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250.120(B)
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Equipment grounding conductors of bare, covered, or insulated aluminum or copper-clad aluminum shall comply with the following: Unless part of an applicable cable wiring method, bare or covered conductors shall not be installed if subject to corrosive conditions or be installed in direct contact with concrete, masonry, or the earth.Terminations made within outdoor enclosures that are listed and identified for the environment shall be permitted within 450 mm (18 in.) of the bottom of the enclosure.Aluminum or copper-clad aluminum conductors external to buildings or enclosures shall not be terminated within 450 mm (18 in.) of the earth, unless terminated within a listed wire connector system. [250.120(B)](https://2023.antflix.net#250.120(B))
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https://2023.antflix.net#250.120(B)
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Chapter 2 Wiring and Protection
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250.120(C)
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If not routed with circuit conductors as permitted in 250.130(C) and 250.134, Exception No. 2, equipment grounding conductors smaller than 6 AWG shall be protected from physical damage by an identified raceway or cable armor unless installed within hollow spaces of the framing members of buildings or structures and if not subject to physical damage. [250.120(C)](https://2023.antflix.net#250.120(C))
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https://2023.antflix.net#250.120(C)
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Chapter 2 Wiring and Protection
|
250.122
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Table 250.122 Minimum Size Equipment Grounding Conductors for Grounding Raceway and Equipment Rating or Setting of Automatic Overcurrent Device in Circuit Ahead of Equipment, Conduit, etc., Not Exceeding (Amperes) Size (AWG or kcmil) Copper Aluminum or Copper-Clad Aluminum* 15 14 12 20 12 10 60 10 8 100 8 6 200 6 4 300 4 2 400 3 1 500 2 1/0 600 1 2/0 800 1/0 3/0 1000 2/0 4/0 1200 3/0 250 1600 4/0 350 2000 250 400 2500 350 600 3000 400 600 4000 500 750 5000 700 1250 6000 800 1250 Note: Where necessary to comply with 250.4(A)(5) or (B)(4), the equipment grounding conductor shall be sized larger than given in this table. *See installation restrictions in 250.120. [250.122](https://2023.antflix.net#250.122)
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https://2023.antflix.net#250.122
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Chapter 2 Wiring and Protection
|
250.122(A)
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Copper, aluminum, or copper-clad aluminum equipment grounding conductors of the wire type shall not be smaller than shown in Table 250.122. The equipment grounding conductor shall not be required to be larger than the circuit conductors supplying the equipment. If a cable tray, a raceway, or a cable armor or sheath is used as the equipment grounding conductor, as provided in 250.118 and 250.134(1), it shall comply with 250.4(A)(5) or (B)(4). Equipment grounding conductors shall be permitted to be sectioned within a multiconductor cable, provided the combined circular mil area complies with. Table 250.122. [250.122(A)](https://2023.antflix.net#250.122(A))
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https://2023.antflix.net#250.122(A)
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Chapter 2 Wiring and Protection
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250.122(B)
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If ungrounded conductors are increased in size for any reason other than as required in 310.15(B) or 310.15(C), wire-type equipment grounding conductors, if installed, shall be increased in size proportionately to the increase in circular mil area of the ungrounded conductors. Exception: Equipment grounding conductors shall be permitted to be sized by a qualified person to provide an effective ground fault current path in accordance with 250.4(A)(5) or (B)(4) [250.122(B)](https://2023.antflix.net#250.122(B))
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https://2023.antflix.net#250.122(B)
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Chapter 2 Wiring and Protection
|
250.122(C)
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A single equipment grounding conductor shall be permitted to be installed for multiple circuits that are installed in the same raceway, cable, trench, or cable tray. It shall be sized from Table 250.122 for the largest overcurrent device protecting circuit conductors in the raceway, cable, trench, or cable tray. Equipment grounding conductors installed in cable trays shall meet the minimum requirements of 392.10(B)(1)(c). [250.122(C)](https://2023.antflix.net#250.122(C))
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https://2023.antflix.net#250.122(C)
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Chapter 2 Wiring and Protection
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250.122(D)
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Equipment grounding conductors for motor circuits shall be sized in accordance with 250.122(D)(1) or (D)(2). [250.122(D)](https://2023.antflix.net#250.122(D))
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https://2023.antflix.net#250.122(D)
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Chapter 2 Wiring and Protection
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250.122(D)(1)
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The equipment grounding conductor size shall not be smaller than determined by 250.122(A) based on the rating of the branch-circuit short-circuit and ground-fault protective device. [250.122(D)(1)](https://2023.antflix.net#250.122(D)(1))
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https://2023.antflix.net#250.122(D)(1)
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Chapter 2 Wiring and Protection
|
250.122(D)(2)
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If the overcurrent device is an instantaneous-trip circuit breaker or a motor short-circuit protector, the equipment grounding conductor shall be sized not smaller than that given by 250.122(A) using the maximum permitted rating of a dual element time-delay fuse selected for branch-circuit short-circuit and ground-fault protection in accordance with 430.52(C)(1)(a). [250.122(D)(2)](https://2023.antflix.net#250.122(D)(2))
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https://2023.antflix.net#250.122(D)(2)
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Chapter 2 Wiring and Protection
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250.122(E)
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The equipment grounding conductor in a flexible cord with the largest circuit conductor 10 AWG or smaller, and the equipment grounding conductor used with fixture wires of any size in accordance with 240.5, shall not be smaller than 18 AWG copper and shall not be smaller than the circuit conductors. The equipment grounding conductor in a flexible cord with a circuit conductor larger than 10 AWG shall be sized in accordance with Table 250.122. [250.122(E)](https://2023.antflix.net#250.122(E))
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https://2023.antflix.net#250.122(E)
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Chapter 2 Wiring and Protection
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250.122(F)
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For circuits of parallel conductors as permitted in 310.10(G), the equipment grounding conductor shall be installed in accordance with 250.122(F)(1) or (F)(2). [250.122(F)](https://2023.antflix.net#250.122(F))
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https://2023.antflix.net#250.122(F)
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Chapter 2 Wiring and Protection
|
250.122(F)(1)
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Single Raceway or Cable Tray, Auxiliary Gutter, or Cable Tray. If circuit conductors are connected in parallel in the same raceway, auxiliary gutter, or cable tray, a single wire-type conductor shall be permitted as the equipment grounding conductor. The wire-type equipment grounding conductor shall be sized in accordance with 250.122 based on the overcurrent protective device for the feeder or branch circuit.Multiple Raceways. If conductors are installed in multiple raceways and are connected in parallel, a wire-type equipment grounding conductor, if used, shall be installed in each raceway and shall be connected in parallel. The equipment grounding conductor installed in each raceway shall be sized in accordance with 250.122 based on the rating of the overcurrent protective device for the feeder or branch circuit.Wire-Type Equipment Grounding Conductors in Cable Trays. Wire-type equipment grounding conductors installed in cable trays shall meet the minimum requirements of 392.10(B)(1)(c).Metal Raceways, Auxiliary Gutters, or Cable Trays. Metal raceways or auxiliary gutters in accordance with 250.118 or cable trays complying with 392.60(B) shall be permitted as the equipment grounding conductor. [250.122(F)(1)](https://2023.antflix.net#250.122(F)(1))
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https://2023.antflix.net#250.122(F)(1)
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Chapter 2 Wiring and Protection
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250.122(F)(2)
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Except as provided in 250.122(F)(2)(c) for raceway or cable tray installations, the equipment grounding conductor in each multiconductor cable shall be sized in accordance with 250.122 based on the overcurrent protective device for the feeder or branch circuit.If circuit conductors of multiconductor cables are connected in parallel, the equipment grounding conductor(s) in each cable shall be connected in parallel.If multiconductor cables are paralleled in the same raceway, auxiliary gutter, or cable tray, a single equipment grounding conductor that is sized in accordance with 250.122 shall be permitted in combination with the equipment grounding conductors provided within the multiconductor cables and shall all be connected together.Equipment grounding conductors installed in cable trays shall meet the minimum requirements of 392.10(B)(1)(c). Cable trays complying with 392.60(B), metal raceways in accordance with 250.118, or auxiliary gutters shall be permitted as the equipment grounding conductor. [250.122(F)(2)](https://2023.antflix.net#250.122(F)(2))
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https://2023.antflix.net#250.122(F)(2)
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Chapter 2 Wiring and Protection
|
250.122(G)
|
Equipment grounding conductors installed with feeder taps shall not be smaller than shown in Table 250.122 based on the rating of the overcurrent device ahead of the feeder on the supply side ahead of the tap but shall not be required to be larger than the tap conductors. [250.122(G)](https://2023.antflix.net#250.122(G))
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https://2023.antflix.net#250.122(G)
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Chapter 2 Wiring and Protection
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250.124(A)
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Separable connections such as those provided in drawout equipment or attachment plugs and mating connectors and receptacles shall provide for first-make, last-break of the equipment grounding conductor. First-make, last-break shall not be required if interlocked equipment, plugs, receptacles, and connectors preclude energization without grounding continuity. [250.124(A)](https://2023.antflix.net#250.124(A))
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https://2023.antflix.net#250.124(A)
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Chapter 2 Wiring and Protection
|
250.124(B)
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No automatic cutout or switch shall be placed in the equipment grounding conductor of a premises wiring system unless the opening of the cutout or switch disconnects all sources of energy. [250.124(B)](https://2023.antflix.net#250.124(B))
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https://2023.antflix.net#250.124(B)
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Chapter 2 Wiring and Protection
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250.126
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The terminal for the connection of the equipment grounding conductor shall be identified by one of the following: A green, not readily removable terminal screw with a hexagonal head.A green, hexagonal, not readily removable terminal nut.A green pressure wire connector. If the terminal for the equipment grounding conductor is not visible, the conductor entrance hole shall be marked with the word green or ground, the letters G or GR, a grounding symbol, or otherwise identified by a distinctive green color. If the terminal for the equipment grounding conductor is readily removable, the area adjacent to the terminal shall be similarly marked.Informational Note: See Informational Note Figure 250.126.Informational Note Figure 250.126 One Example of a Symbol Used to Identify the Grounding Termination Point for an Equipment Grounding Conductor. [250.126](https://2023.antflix.net#250.126)
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https://2023.antflix.net#250.126
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Chapter 2 Wiring and Protection
|
250.130
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Equipment grounding conductor connections at the source of separately derived systems shall be made in accordance with 250.30(A)(1). Equipment grounding conductor connections at service equipment shall be made as indicated in 250.130(A) or (B). For replacement of non-grounding-type receptacles with grounding-type receptacles, or snap switches without an equipment grounding terminal with snap switches with an equipment grounding terminal, and for branch-circuit extensions only in existing installations that do not have an equipment grounding conductor in the branch circuit, connections shall be permitted as indicated in 250.130(C). [250.130](https://2023.antflix.net#250.130)
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https://2023.antflix.net#250.130
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Chapter 2 Wiring and Protection
|
250.130(A)
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The connection shall be made by bonding the equipment grounding conductor to the grounded service conductor and the grounding electrode conductor. [250.130(A)](https://2023.antflix.net#250.130(A))
|
https://2023.antflix.net#250.130(A)
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Chapter 2 Wiring and Protection
|
250.130(B)
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The connection shall be made by bonding the equipment grounding conductor to the grounding electrode conductor. [250.130(B)](https://2023.antflix.net#250.130(B))
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https://2023.antflix.net#250.130(B)
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Chapter 2 Wiring and Protection
|
250.130(C)
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The equipment grounding conductor that is connected to a grounding-type receptacle, a snap switch with an equipment grounding terminal, or a branch-circuit extension shall be permitted to be connected to any of the following: Any accessible point on the grounding electrode system as described in 250.50Any accessible point on the grounding electrode conductorThe equipment grounding terminal bar within the enclosure where the branch circuit for the receptacle or branch circuit originatesAn equipment grounding conductor that is part of another branch circuit that originates from the enclosure where the branch circuit for the receptacle, snap switch, or branch circuit originatesFor grounded systems, the grounded service conductor within the service equipment enclosureFor ungrounded systems, the grounding terminal bar within the service equipment enclosureInformational Note No. 1: See 406.4(D) for the use of a ground-fault circuit-interrupting type of receptacle.Informational Note No. 2: See 404.9(B) for requirements regarding grounding of snap switches. [250.130(C)](https://2023.antflix.net#250.130(C))
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https://2023.antflix.net#250.130(C)
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Chapter 2 Wiring and Protection
|
250.132
|
Isolated sections of metal raceway or cable armor, if required to be connected to an equipment grounding conductor, shall be connected in accordance with 250.134. [250.132](https://2023.antflix.net#250.132)
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https://2023.antflix.net#250.132
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Chapter 2 Wiring and Protection
|
250.134
|
Unless connected to the grounded circuit conductor as permitted by 250.32, 250.140, and 250.142, non-current-carrying metal parts of equipment, raceways, and other enclosures, if grounded, shall be connected to an equipment grounding conductor by one of the following methods: By connecting to any of the equipment grounding conductors permitted by 250.118(2) through (14)By connecting to an equipment grounding conductor of the wire type that is contained within the same raceway, contained within the same cable, or otherwise run with the circuit conductorsException No. 1: As provided in 250.130(C), the equipment grounding conductor shall be permitted to be run separately from the circuit conductors.Exception No. 2: For dc circuits, the equipment grounding conductor shall be permitted to be run separately from the circuit conductorsInformational Note No. 1: See 250.102 and 250.168 for equipment bonding jumper requirements.Informational Note No. 2: See 400.10 for use of flexible cords and flexible cables for fixed equipment. [250.134](https://2023.antflix.net#250.134)
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https://2023.antflix.net#250.134
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Chapter 2 Wiring and Protection
|
250.136
|
If a metal rack or structure is connected to an equipment grounding conductor in accordance with 250.134, it shall be permitted to serve as the equipment grounding conductor for electrical equipment secured to and in electrical contact with the metal rack or structure. [250.136](https://2023.antflix.net#250.136)
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https://2023.antflix.net#250.136
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Chapter 2 Wiring and Protection
|
250.138
|
Non-current-carrying metal parts of cord-and-plug-connected equipment, if required to be connected to an equipment grounding conductor, shall be connected by one of the methods in 250.138(A) or (B). [250.138](https://2023.antflix.net#250.138)
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https://2023.antflix.net#250.138
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Chapter 2 Wiring and Protection
|
250.138(A)
|
By means of an equipment grounding conductor run with the power supply conductors in a cable assembly or flexible cord properly terminated in a grounding-type attachment plug with one fixed grounding contact. Exception: The grounding contacting pole of grounding-type plug-in ground-fault circuit interrupters shall be permitted to be of the movable, self-restoring type, on circuits operating at not over 150 volts between any two conductors or over 150 volts between any conductor and ground. [250.138(A)](https://2023.antflix.net#250.138(A))
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https://2023.antflix.net#250.138(A)
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Chapter 2 Wiring and Protection
|
250.138(B)
|
By means of a separate flexible wire or strap, insulated or bare, connected to an equipment grounding conductor, and protected as well as practicable against physical damage, if part of equipment. [250.138(B)](https://2023.antflix.net#250.138(B))
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https://2023.antflix.net#250.138(B)
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Chapter 2 Wiring and Protection
|
250.140
|
Frames of electric ranges, wall-mounted ovens, counter-mounted cooking units, clothes dryers, and outlet or junction boxes that are part of the circuit shall be connected to the equipment grounding conductor in accordance with 250.140(A) or the grounded conductor in accordance with 250.140(B). [250.140](https://2023.antflix.net#250.140)
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https://2023.antflix.net#250.140
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Chapter 2 Wiring and Protection
|
250.140(A)
|
The circuit supplying the appliance shall include an equipment grounding conductor. The frame of the appliance shall be connected to the equipment grounding conductor in the manner specified by 250.134 or 250.138. [250.140(A)](https://2023.antflix.net#250.140(A))
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https://2023.antflix.net#250.140(A)
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Chapter 2 Wiring and Protection
|
250.140(B)
|
For existing branch-circuit installations only, if an equipment grounding conductor is not present in the outlet or junction box the frame of the appliance shall be permitted to be connected to the grounded conductor if all the conditions in the following list items (1), (2), and (3) are met and the grounded conductor complies with either list item (4) or (5): The supply circuit is 120/240-volt, single-phase, 3-wire; or 208Y/120-volt derived from a 3-phase, 4-wire, wye connected system.The grounded conductor is not smaller than 10 AWG copper or 8 AWG aluminum or copper-clad aluminum.Grounding contacts of receptacles furnished as part of the equipment are bonded to the equipment.The grounded conductor is insulated, or the grounded conductor is uninsulated and part of a Type SE service-entrance cable and the branch circuit originates at the service equipment.The grounded conductor is part of a Type SE service-entrance cable that originates in equipment other than a service. The grounded conductor shall be insulated or field covered within the supply enclosure with listed insulating material, such as tape or sleeving to prevent contact of the uninsulated conductor with any normally noncurrent-carrying metal parts. [250.140(B)](https://2023.antflix.net#250.140(B))
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https://2023.antflix.net#250.140(B)
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Chapter 2 Wiring and Protection
|
250.142(A)
|
A grounded circuit conductor shall be permitted to be connected to non-current-carrying metal parts of equipment, raceways, and other enclosures at any of the following locations: On the supply side or within the enclosure of the ac service disconnecting meansOn the supply side or within the enclosure of the main disconnecting means for separate buildings as provided in 250.32(B)(1) Exception No. 1On the supply side or within the enclosure of the main disconnecting means or overcurrent devices of a separately derived system where permitted by 250.30(A)(1) [250.142(A)](https://2023.antflix.net#250.142(A))
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https://2023.antflix.net#250.142(A)
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Chapter 2 Wiring and Protection
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250.142(B)
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Except as permitted in 250.30(A)(1), 250.32(B)(1), Exception No. 1, and Part X of Article 250, a grounded circuit conductor shall not be connected to noncurrent-carrying metal parts of equipment on the load side of the service disconnecting means or on the load side of a separately derived system disconnecting means or the overcurrent devices for a separately derived system not having a main disconnecting means. Exception No. 1: The frames of ranges, wall-mounted ovens, counter-mounted cooking units, and clothes dryers under the conditions permitted for existing installations by 250.140 shall be permitted to be connected to the grounded circuit conductor. Exception No. 2: It shall be permissible to connect meter enclosures to the grounded circuit conductor on the load side of the service disconnect if all of the following conditions apply: (1) Ground-fault protection of equipment is not installed. (2) All meter enclosures are located immediately adjacent to the service disconnecting means. (3) The size of the grounded circuit conductor is not smaller than the size specified in Table 250.122 for equipment grounding conductors. Exception No. 3: Electrode-type boilers operating at over 1000 volts shall be grounded as required in 495.72(E)(1) and 495.74. [250.142(B)](https://2023.antflix.net#250.142(B))
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https://2023.antflix.net#250.142(B)
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Chapter 2 Wiring and Protection
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250.144
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If equipment is required to be grounded and is supplied by more than one circuit containing an equipment grounding conductor, a means to terminate each equipment grounding conductor meeting the requirements of 250.8 shall be provided as specified in 250.134 and 250.138. [250.144](https://2023.antflix.net#250.144)
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https://2023.antflix.net#250.144
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Chapter 2 Wiring and Protection
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250.146
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An equipment bonding jumper shall be used to connect the grounding terminal of a grounding-type receptacle to a metal box that is connected to an equipment grounding conductor, except as permitted in 250.146(A) through (D). The equipment bonding jumper shall be sized in accordance with Table 250.122. [250.146](https://2023.antflix.net#250.146)
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https://2023.antflix.net#250.146
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Chapter 2 Wiring and Protection
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250.146(A)
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If a metal box is mounted on the surface, the direct metal-to-metal contact between the device yoke or strap to the box shall be permitted to provide the required effective ground-fault current path. At least one of the insulating washers shall be removed from receptacles that do not have a contact yoke or device to ensure direct metal-to-metal contact. Direct metal-to-metal contact for providing continuity applies to cover-mounted receptacles if the box and cover combination are listed as providing continuity between the box and the receptacle. A listed exposed work cover shall be permitted to be the grounding and bonding means under both of the following conditions: The device is attached to the cover with at least two fasteners that are permanent (such as a rivet) or have a thread-locking or screw- or nut-locking means.The cover mounting holes are located on a flat nonraised portion of the cover. [250.146(A)](https://2023.antflix.net#250.146(A))
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https://2023.antflix.net#250.146(A)
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Chapter 2 Wiring and Protection
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250.146(B)
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Contact devices or yokes designed and listed as self-grounding shall be permitted in conjunction with the supporting screws to establish equipment bonding between the device yoke and flush-type boxes. [250.146(B)](https://2023.antflix.net#250.146(B))
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https://2023.antflix.net#250.146(B)
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Chapter 2 Wiring and Protection
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250.146(C)
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Floor boxes designed for and listed as providing continuity between the box and the device shall be permitted. [250.146(C)](https://2023.antflix.net#250.146(C))
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https://2023.antflix.net#250.146(C)
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Chapter 2 Wiring and Protection
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250.146(D)
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If installed for the reduction of electromagnetic interference on the equipment grounding conductor, a receptacle in which the grounding terminal is purposely insulated from the receptacle mounting means shall be permitted. The receptacle grounding terminal shall be connected to an insulated equipment grounding conductor run with the circuit conductors. This equipment grounding conductor shall be permitted to pass through one or more panelboards without a connection to the panelboard grounding terminal bar as permitted in 408.40, Exception, so as to terminate within the same building or structure directly at an equipment grounding conductor terminal of the applicable derived system or service. If installed in accordance with this section, this equipment grounding conductor shall also be permitted to pass through boxes, wireways, or other enclosures without being connected to such enclosures. Informational Note: Use of an isolated equipment grounding conductor does not relieve the requirement for connecting the raceway system and outlet box to an equipment grounding conductor. [250.146(D)](https://2023.antflix.net#250.146(D))
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https://2023.antflix.net#250.146(D)
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Chapter 2 Wiring and Protection
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250.148
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If circuit conductors are spliced within a box or terminated on equipment within or supported by a box, the installation shall comply with 250.148(A) through (D). Exception: The equipment grounding conductor permitted in 250.146(D) shall not be required to be connected to the other equipment grounding conductors or to the box. [250.148](https://2023.antflix.net#250.148)
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https://2023.antflix.net#250.148
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Chapter 2 Wiring and Protection
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250.148(A)
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All equipment grounding conductors that are spliced or terminated within the box shall be connected together. Connections and splices shall be made in accordance with 110.14(B) and 250.8 except that insulation shall not be required. [250.148(A)](https://2023.antflix.net#250.148(A))
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https://2023.antflix.net#250.148(A)
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Chapter 2 Wiring and Protection
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250.148(B)
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The arrangement of grounding connections shall be such that the disconnection or the removal of a luminaire, receptacle, or other device fed from the box does not interrupt the electrical continuity of the equipment grounding conductor(s) providing an effective ground-fault current path. [250.148(B)](https://2023.antflix.net#250.148(B))
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https://2023.antflix.net#250.148(B)
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Chapter 2 Wiring and Protection
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250.148(C)
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A connection used for no other purpose shall be made between the metal box and the equipment grounding conductor(s). The equipment bonding jumper or equipment grounding conductor shall be sized from Table 250.122 based on the largest overcurrent device protecting circuit conductors in the box. [250.148(C)](https://2023.antflix.net#250.148(C))
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https://2023.antflix.net#250.148(C)
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Chapter 2 Wiring and Protection
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250.148(D)
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One or more equipment grounding conductors brought into a nonmetallic outlet box shall be arranged to provide a connection to any fitting or device in that box requiring connection to an equipment grounding conductor. [250.148(D)](https://2023.antflix.net#250.148(D))
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https://2023.antflix.net#250.148(D)
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Chapter 2 Wiring and Protection
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250.160
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Direct-current systems shall comply with Part VIII and other sections of Article 250 not specifically intended for ac systems. [250.160](https://2023.antflix.net#250.160)
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https://2023.antflix.net#250.160
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Chapter 2 Wiring and Protection
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250.162
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Direct-current circuits and systems shall be grounded as provided for in 250.162(A) and (B). [250.162](https://2023.antflix.net#250.162)
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https://2023.antflix.net#250.162
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Chapter 2 Wiring and Protection
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250.162(A)
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A 2-wire, dc system supplying premises wiring and operating at greater than 60 volts but not greater than 300 volts shall be grounded. Exception No. 1: A system equipped with a ground detector and supplying only industrial equipment in limited areas shall not be required to be grounded if installed immediately adjacent to, or integral with, the source of supply. Exception No. 2: A rectifier-derived dc system supplied from an ac system complying with 250.20 shall not be required to be grounded. Exception No. 3: Direct-current fire alarm circuits having a maximum current of 0.030 ampere as specified in Article 760, Part III, shall not be required to be grounded. [250.162(A)](https://2023.antflix.net#250.162(A))
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https://2023.antflix.net#250.162(A)
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