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Chapter 2 Wiring and Protection | 250.28(D)(2) | If a service consists of more than a single enclosure as permitted in 230.71(B), the main bonding jumper for each enclosure shall be sized in accordance with 250.28(D)(1) based on the largest ungrounded service conductor serving that enclosure. [250.28(D)(2)](https://2023.antflix.net#250.28(D)(2)) | https://2023.antflix.net#250.28(D)(2) |
Chapter 2 Wiring and Protection | 250.28(D)(3) | If a separately derived system supplies more than a single enclosure, the system bonding jumper for each enclosure shall be sized in accordance with 250.28(D)(1) based on the largest ungrounded feeder conductor serving that enclosure, or a single system bonding jumper shall be installed at the source and sized in accor... | https://2023.antflix.net#250.28(D)(3) |
Chapter 2 Wiring and Protection | 250.30 | In addition to complying with 250.30(A) for grounded systems, or as provided in 250.30(B) for ungrounded systems, separately derived systems shall comply with 250.20, 250.21, or 250.26, as applicable. Multiple power sources of the same type that are connected in parallel to form one system that supplies premises wiring... | https://2023.antflix.net#250.30 |
Chapter 2 Wiring and Protection | 250.30(A) | A separately derived ac system that is grounded shall comply with 250.30(A)(1) through (A)(8). Except as otherwise permitted in this article, a grounded conductor shall not be connected to normally non-current-carrying metal parts of equipment, be connected to equipment grounding conductors, or be reconnected to ground... | https://2023.antflix.net#250.30(A) |
Chapter 2 Wiring and Protection | 250.30(A)(1) | An unspliced system bonding jumper shall comply with 250.28(A) through (D). This connection shall be made at any single point on the separately derived system from the source to the first system disconnecting means or overcurrent device, or it shall be made at the source of a separately derived system that has no disco... | https://2023.antflix.net#250.30(A)(1) |
Chapter 2 Wiring and Protection | 250.30(A)(2) | If the source of a separately derived system and the first disconnecting means are located in separate enclosures, a supply-side bonding jumper shall be installed with the circuit conductors from the source enclosure to the first disconnecting means enclosure. A supply-side bonding jumper shall not be required to be la... | https://2023.antflix.net#250.30(A)(2) |
Chapter 2 Wiring and Protection | 250.30(A)(3) | If a grounded conductor is installed and the system bonding jumper connection is not located at the source, 250.30(A)(3)(a) through (A)(3)(d) shall apply. The grounded conductor shall not be required to be larger than the derived ungrounded conductors. Sizing for a Single Raceway. The grounded conductor shall not be sm... | https://2023.antflix.net#250.30(A)(3) |
Chapter 2 Wiring and Protection | 250.30(A)(4) | The building or structure grounding electrode system shall be used as the grounding electrode for the separately derived system. If located outdoors, the grounding electrode shall be in accordance with 250.30(C). Exception: If a separately derived system originates in equipment that is listed and identified as suitable... | https://2023.antflix.net#250.30(A)(4) |
Chapter 2 Wiring and Protection | 250.30(A)(5) | A grounding electrode conductor for a single separately derived system shall be sized in accordance with 250.66 for the derived ungrounded conductors. It shall be used to connect the grounded conductor of the derived system to the grounding electrode in accordance with 250.30(A)(4), or as permitted in 250.68(C)(1) and ... | https://2023.antflix.net#250.30(A)(5) |
Chapter 2 Wiring and Protection | 250.30(A)(6) | A common grounding electrode conductor for multiple separately derived systems shall be permitted. If installed, the common grounding electrode conductor shall be used to connect the grounded conductor of each separately derived system to the grounding electrode as specified in 250.30(A)(4). A grounding electrode condu... | https://2023.antflix.net#250.30(A)(6) |
Chapter 2 Wiring and Protection | 250.30(A)(7) | The installation of all grounding electrode conductors shall comply with 250.64(A), (B), (C), and (E). [250.30(A)(7)](https://2023.antflix.net#250.30(A)(7)) | https://2023.antflix.net#250.30(A)(7) |
Chapter 2 Wiring and Protection | 250.30(A)(8) | Structural steel and metal piping shall be connected to the grounded conductor of a separately derived system in accordance with 250.104(D). [250.30(A)(8)](https://2023.antflix.net#250.30(A)(8)) | https://2023.antflix.net#250.30(A)(8) |
Chapter 2 Wiring and Protection | 250.30(B) | The equipment of an ungrounded separately derived system shall be grounded and bonded as specified in 250.30(B)(1) through (B)(3). [250.30(B)](https://2023.antflix.net#250.30(B)) | https://2023.antflix.net#250.30(B) |
Chapter 2 Wiring and Protection | 250.30(B)(1) | A grounding electrode conductor, sized in accordance with 250.66 for the largest derived ungrounded conductor(s) or set of derived ungrounded conductors, shall be used to connect the metal enclosures of the derived system to the grounding electrode as specified in 250.30(A)(5) or (A)(6), as applicable. This connection ... | https://2023.antflix.net#250.30(B)(1) |
Chapter 2 Wiring and Protection | 250.30(B)(2) | Except as permitted by 250.34 for portable and vehicle-mounted generators, the grounding electrode shall comply with 250.30(A)(4). [250.30(B)(2)](https://2023.antflix.net#250.30(B)(2)) | https://2023.antflix.net#250.30(B)(2) |
Chapter 2 Wiring and Protection | 250.30(B)(3) | A supply-side bonding jumper shall be installed from the source of a separately derived system to the first disconnecting means in compliance with 250.30(A)(2). [250.30(B)(3)](https://2023.antflix.net#250.30(B)(3)) | https://2023.antflix.net#250.30(B)(3) |
Chapter 2 Wiring and Protection | 250.30(C) | If the source of the separately derived system is located outside the building or structure supplied, a grounding electrode connection shall be made at the source location to one or more grounding electrodes in accordance with 250.50. In addition, the installation shall be in accordance with 250.30(A) for grounded syst... | https://2023.antflix.net#250.30(C) |
Chapter 2 Wiring and Protection | 250.32(A) | A building(s) or structure(s) supplied by a feeder(s) or branch circuit(s) shall have a grounding electrode system and grounding electrode conductor installed in accordance with Part III of Article 250. Exception: A grounding electrode system and grounding electrode conductor shall not be required if only a single bran... | https://2023.antflix.net#250.32(A) |
Chapter 2 Wiring and Protection | 250.32(B)(1) | An equipment grounding conductor, as described in 250.118, shall be run with the supply conductors and be connected to the building or structure disconnecting means and to the grounding electrode(s). The equipment grounding conductor shall be used for grounding or bonding of equipment, structures, or frames required to... | https://2023.antflix.net#250.32(B)(1) |
Chapter 2 Wiring and Protection | 250.32(B)(2) | With Overcurrent Protection. If overcurrent protection is provided where the conductors originate, the installation shall comply with 250.32(B)(1).Without Overcurrent Protection. If overcurrent protection is not provided where the conductors originate, the installation shall comply with 250.30(A). If installed, the sup... | https://2023.antflix.net#250.32(B)(2) |
Chapter 2 Wiring and Protection | 250.32(C)(1) | An equipment grounding conductor, as described in 250.118, shall be installed with the supply conductors and be connected to the building or structure disconnecting means and to the grounding electrode(s). The grounding electrode(s) shall also be connected to the building or structure disconnecting means. [250.32(C)(1)... | https://2023.antflix.net#250.32(C)(1) |
Chapter 2 Wiring and Protection | 250.32(C)(2) | With Overcurrent Protection. If overcurrent protection is provided where the conductors originate, the installation shall comply with 250.32(C)(1).Without Overcurrent Protection. If overcurrent protection is not provided where the conductors originate, the installation shall comply with 250.30(B). If installed, the sup... | https://2023.antflix.net#250.32(C)(2) |
Chapter 2 Wiring and Protection | 250.32(D) | If one or more disconnecting means supply one or more additional buildings or structures under single management, and where these disconnecting means are located remote from those buildings or structures in accordance with 225.31(B), Exception No. 1 and No. 2, 700.12(D)(4), 701.12(D)(3), or 702.12, all of the following... | https://2023.antflix.net#250.32(D) |
Chapter 2 Wiring and Protection | 250.32(E) | The size of the grounding electrode conductor to the grounding electrode(s) shall not be smaller than given in 250.66, based on the largest ungrounded supply conductor. The installation shall comply with Part III of this article. [250.32(E)](https://2023.antflix.net#250.32(E)) | https://2023.antflix.net#250.32(E) |
Chapter 2 Wiring and Protection | 250.34(A) | The frame of a portable generator shall not be required to be connected to a grounding electrode as defined in 250.52 for a system supplied by the generator under both of the following conditions: The generator supplies only equipment mounted on the generator, cord-and-plug-connected equipment through receptacles mount... | https://2023.antflix.net#250.34(A) |
Chapter 2 Wiring and Protection | 250.34(B) | The frame of a vehicle or trailer shall not be required to be connected to a grounding electrode as defined in 250.52 for a system supplied by a generator located on this vehicle or trailer under all of the following conditions: The frame of the generator is bonded to the vehicle or trailer frame.The generator supplies... | https://2023.antflix.net#250.34(B) |
Chapter 2 Wiring and Protection | 250.34(C) | A conductor that is required to be grounded by 250.26 shall be connected to the generator frame if the generator is a component of a separately derived system. Informational Note: See 250.30 for grounding portable generators supplying fixed wiring systems. [250.34(C)](https://2023.antflix.net#250.34(C)) | https://2023.antflix.net#250.34(C) |
Chapter 2 Wiring and Protection | 250.35 | A conductor that provides an effective ground-fault current path shall be installed with the supply conductors from a permanently installed generator(s) to the first disconnecting mean(s) in accordance with 250.35(A) or (B). [250.35](https://2023.antflix.net#250.35) | https://2023.antflix.net#250.35 |
Chapter 2 Wiring and Protection | 250.35(A) | If the generator is installed as a separately derived system, the requirements in 250.30 shall apply. [250.35(A)](https://2023.antflix.net#250.35(A)) | https://2023.antflix.net#250.35(A) |
Chapter 2 Wiring and Protection | 250.35(B) | If the generator is installed as a nonseparately derived system, and overcurrent protection is not integral with the generator assembly, a supply-side bonding jumper shall be installed between the generator equipment grounding terminal and the equipment grounding terminal, bar, or bus of the disconnecting mean(s). It s... | https://2023.antflix.net#250.35(B) |
Chapter 2 Wiring and Protection | 250.36 | Impedance grounded systems in which a grounding impedance device, typically a resistor, limits the ground-fault current shall be permitted for 3-phase ac systems of 480 volts to 1000 volts if all the following conditions are met: The conditions of maintenance and supervision ensure that only qualified persons service t... | https://2023.antflix.net#250.36 |
Chapter 2 Wiring and Protection | 250.36(A) | The grounding impedance device shall be installed between the grounding electrode conductor and the impedance grounding conductor connected to the system neutral point. If a neutral point is not available, the grounding impedance shall be installed between the grounding electrode conductor and the impedance grounding c... | https://2023.antflix.net#250.36(A) |
Chapter 2 Wiring and Protection | 250.36(B) | The impedance grounding conductor from the neutral point of the transformer or generator to its connection point to the grounding impedance shall be fully insulated. The impedance grounding conductor shall have an ampacity of not less than the maximum current rating of the grounding impedance but in no case shall the i... | https://2023.antflix.net#250.36(B) |
Chapter 2 Wiring and Protection | 250.36(C) | The system shall not be connected to ground except through the grounding impedance device. Informational Note: The impedance is normally selected to limit the ground-fault current to a value slightly greater than or equal to the capacitive charging current of the system. This value of impedance will also limit transien... | https://2023.antflix.net#250.36(C) |
Chapter 2 Wiring and Protection | 250.36(D) | The impedance grounding conductor shall be permitted to be installed in a separate raceway from the ungrounded conductors. It shall not be required to run this conductor with the phase conductors to the first system disconnecting means or overcurrent device. [250.36(D)](https://2023.antflix.net#250.36(D)) | https://2023.antflix.net#250.36(D) |
Chapter 2 Wiring and Protection | 250.36(E) | The impedance bonding jumper (the connection between the equipment grounding conductors and the grounding impedance device) shall be an unspliced conductor run from the first system disconnecting means or overcurrent device to the grounded side of the grounding impedance device. [250.36(E)](https://2023.antflix.net#250... | https://2023.antflix.net#250.36(E) |
Chapter 2 Wiring and Protection | 250.36(F) | For services or separately derived systems, the grounding electrode conductor shall be connected at any point from the grounded side of the grounding impedance device to the equipment grounding connection at the service equipment or the first system disconnecting means of a separately derived system. [250.36(F)](https:... | https://2023.antflix.net#250.36(F) |
Chapter 2 Wiring and Protection | 250.36(G) | The impedance bonding jumper shall be sized in accordance with either of the following: If the grounding electrode conductor connection is made at the grounding impedance device, the equipment bonding jumper shall be sized in accordance with 250.66, based on the size of the service entrance conductors for a service or ... | https://2023.antflix.net#250.36(G) |
Chapter 2 Wiring and Protection | 250.50 | All grounding electrodes as described in 250.52(A)(1) through (A)(7) that are present at each building or structure served shall be bonded together to form the grounding electrode system. If none of these grounding electrodes exist, one or more of the grounding electrodes specified in 250.52(A)(4) through (A)(8) shall ... | https://2023.antflix.net#250.50 |
Chapter 2 Wiring and Protection | 250.52(A)(1) | A metal underground water pipe in direct contact with the earth for 3.0 m (10 ft) or more (including any metal well casing bonded to the pipe) and electrically continuous (or made electrically continuous by bonding around insulating joints or insulating pipe) to the points of connection of the grounding electrode condu... | https://2023.antflix.net#250.52(A)(1) |
Chapter 2 Wiring and Protection | 250.52(A)(2) | One or more metal in-ground support structure(s) in direct contact with the earth vertically for 3.0 m (10 ft) or more, with or without concrete encasement. If multiple metal in-ground support structures are present at a building or a structure, it shall be permissible to bond only one into the grounding electrode syst... | https://2023.antflix.net#250.52(A)(2) |
Chapter 2 Wiring and Protection | 250.52(A)(3) | A concrete-encased electrode shall consist of at least 6.0 m (20 ft) of either of the following: One or more bare or zinc galvanized or other electrically conductive coated rebar of not less than 13 mm (1/2 in.) in diameter, installed in one continuous 6.0 m (20 ft) length, or if in multiple pieces, the rebar shall be ... | https://2023.antflix.net#250.52(A)(3) |
Chapter 2 Wiring and Protection | 250.52(A)(4) | A ground ring encircling the building or structure, in direct contact with the earth, consisting of at least 6.0 m (20 ft) of bare copper conductor not smaller than 2 AWG. [250.52(A)(4)](https://2023.antflix.net#250.52(A)(4)) | https://2023.antflix.net#250.52(A)(4) |
Chapter 2 Wiring and Protection | 250.52(A)(5) | Rod and pipe electrodes shall not be less than 2.44 m (8 ft) in length and consist of the following materials. Grounding electrodes of pipe or conduit shall not be smaller than metric designator 21 (trade size 3/4) and, where of steel, shall have the outer surface galvanized or otherwise metal-coated for corrosion prot... | https://2023.antflix.net#250.52(A)(5) |
Chapter 2 Wiring and Protection | 250.52(A)(6) | Other listed grounding electrodes shall be permitted. [250.52(A)(6)](https://2023.antflix.net#250.52(A)(6)) | https://2023.antflix.net#250.52(A)(6) |
Chapter 2 Wiring and Protection | 250.52(A)(7) | Each plate electrode shall expose not less than 0.186 m2 (2 ft2) of surface to exterior soil. Electrodes of bare or electrically conductive coated iron or steel plates shall be at least 6.4 mm (1/4 in.) in thickness. Solid, uncoated electrodes of nonferrous metal shall be at least 1.5 mm (0.06 in.) in thickness. [250.5... | https://2023.antflix.net#250.52(A)(7) |
Chapter 2 Wiring and Protection | 250.52(A)(8) | Other local metal underground systems or structures such as piping systems, underground tanks, and underground metal well casings that are not bonded to a metal water pipe. [250.52(A)(8)](https://2023.antflix.net#250.52(A)(8)) | https://2023.antflix.net#250.52(A)(8) |
Chapter 2 Wiring and Protection | 250.52(B) | The following systems and materials shall not be used as grounding electrodes: Metal underground gas piping systemsAluminumThe structures and structural rebar described in 680.26(B)(1) and (B)(2)Informational Note: See 250.104(B) for bonding requirements of gas piping. [250.52(B)](https://2023.antflix.net#250.52(B)) | https://2023.antflix.net#250.52(B) |
Chapter 2 Wiring and Protection | 250.53(A) | Rod, pipe, and plate electrodes shall be free from nonconductive coatings such as paint or enamel. Rod, pipe, and plate electrodes shall meet the requirements of 250.53(A)(1) through (A)(3). [250.53(A)](https://2023.antflix.net#250.53(A)) | https://2023.antflix.net#250.53(A) |
Chapter 2 Wiring and Protection | 250.53(A)(1) | If practicable, rod, pipe, and plate electrodes shall be embedded below permanent moisture level. [250.53(A)(1)](https://2023.antflix.net#250.53(A)(1)) | https://2023.antflix.net#250.53(A)(1) |
Chapter 2 Wiring and Protection | 250.53(A)(2) | A single rod, pipe, or plate electrode shall be supplemented by an additional electrode of a type specified in 250.52(A)(2) through (A)(8). The supplemental electrode shall be permitted to be bonded to one of the following: Rod, pipe, or plate electrodeGrounding electrode conductorGrounded service-entrance conductorNon... | https://2023.antflix.net#250.53(A)(2) |
Chapter 2 Wiring and Protection | 250.53(A)(3) | If multiple rod, pipe, or plate electrodes are installed to meet the requirements of this section, they shall not be less than 1.8 m (6 ft) apart. Informational Note: The paralleling efficiency of rods is increased by spacing them twice the length of the longest rod. [250.53(A)(3)](https://2023.antflix.net#250.53(A)(3)... | https://2023.antflix.net#250.53(A)(3) |
Chapter 2 Wiring and Protection | 250.53(A)(4) | The electrode shall be installed such that at least 2.44 m (8 ft) of length is in contact with the soil. It shall be driven to a depth of not less than 2.44 m (8 ft) except that, where rock bottom is encountered, the electrode shall be driven at an oblique angle not to exceed 45 degrees from the vertical or, where rock... | https://2023.antflix.net#250.53(A)(4) |
Chapter 2 Wiring and Protection | 250.53(A)(5) | Plate electrodes shall be installed not less than 750 mm (30 in.) below the surface of the earth. [250.53(A)(5)](https://2023.antflix.net#250.53(A)(5)) | https://2023.antflix.net#250.53(A)(5) |
Chapter 2 Wiring and Protection | 250.53(B) | If more than one of the electrodes of the type specified in 250.52(A)(5) or (A)(7) are used, each electrode of one grounding system (including that used for strike termination devices) shall not be less than 1.83 m (6 ft) from any other electrode of another grounding system. [250.53(B)](https://2023.antflix.net#250.53(... | https://2023.antflix.net#250.53(B) |
Chapter 2 Wiring and Protection | 250.53(C) | The bonding jumper(s) used to connect the grounding electrodes together to form the grounding electrode system shall be installed in accordance with 250.64(A), (B), and (E), shall be sized in accordance with 250.66, and shall be connected in the manner specified in 250.70. Rebar shall not be used as a conductor to inte... | https://2023.antflix.net#250.53(C) |
Chapter 2 Wiring and Protection | 250.53(D) | If used as a grounding electrode, metal underground water pipe shall meet the requirements of 250.53(D)(1) and (D)(2). [250.53(D)](https://2023.antflix.net#250.53(D)) | https://2023.antflix.net#250.53(D) |
Chapter 2 Wiring and Protection | 250.53(D)(1) | Continuity of the grounding path or the bonding connection to interior piping shall not rely on water meters or filtering devices and similar equipment. [250.53(D)(1)](https://2023.antflix.net#250.53(D)(1)) | https://2023.antflix.net#250.53(D)(1) |
Chapter 2 Wiring and Protection | 250.53(D)(2) | A metal underground water pipe shall be supplemented by an additional electrode of a type specified in 250.52(A)(2) through (A)(8). If the supplemental electrode is of the rod, pipe, or plate type, it shall comply with 250.53(A). The supplemental electrode shall be bonded to one of the following: Grounding electrode co... | https://2023.antflix.net#250.53(D)(2) |
Chapter 2 Wiring and Protection | 250.53(E) | If the supplemental electrode is a rod, pipe, or plate electrode, that portion of the bonding jumper that is the sole connection to the supplemental grounding electrode shall not be required to be larger than 6 AWG copper wire or 4 AWG aluminum or copper-clad aluminum wire. [250.53(E)](https://2023.antflix.net#250.53(E... | https://2023.antflix.net#250.53(E) |
Chapter 2 Wiring and Protection | 250.53(F) | The ground ring shall be installed not less than 750 mm (30 in.) below the surface of the earth. [250.53(F)](https://2023.antflix.net#250.53(F)) | https://2023.antflix.net#250.53(F) |
Chapter 2 Wiring and Protection | 250.54 | One or more grounding electrodes shall be permitted to be connected to the equipment grounding conductors specified in 250.118 and shall not be required to comply with the electrode bonding requirements of 250.50 or 250.53(C) or the resistance requirements of 250.53(A)(2) Exception, but the earth shall not be used as a... | https://2023.antflix.net#250.54 |
Chapter 2 Wiring and Protection | 250.58 | If an ac system is connected to a grounding electrode in or at a building or structure, the same electrode shall be used to ground conductor enclosures and equipment in or on that building or structure. If separate services, feeders, or branch circuits supply a building and are required to be connected to a grounding e... | https://2023.antflix.net#250.58 |
Chapter 2 Wiring and Protection | 250.60 | Conductors and driven pipes, rods, or plate electrodes used for grounding strike termination devices shall not be used in lieu of the grounding electrodes required by 250.50 for grounding wiring systems and equipment. This provision shall not prohibit the required bonding together of grounding electrodes of different s... | https://2023.antflix.net#250.60 |
Chapter 2 Wiring and Protection | 250.62 | The grounding electrode conductor shall be of copper, aluminum, copper-clad aluminum, or the items as permitted in 250.68(C). The material selected shall be resistant to any corrosive condition existing at the installation or shall be protected against corrosion. Conductors of the wire type shall be solid or stranded, ... | https://2023.antflix.net#250.62 |
Chapter 2 Wiring and Protection | 250.64 | Grounding electrode conductors at the service, at each building or structure where supplied by a feeder(s) or branch circuit(s), or at a separately derived system shall be installed as specified in 250.64(A) through (G). [250.64](https://2023.antflix.net#250.64) | https://2023.antflix.net#250.64 |
Chapter 2 Wiring and Protection | 250.64(A) | Grounding electrode conductors of bare, covered, or insulated aluminum or copper-clad aluminum shall comply with the following: Bare or covered conductors without an extruded polymeric covering shall not be installed where subject to corrosive conditions or be installed in direct contact with concrete.Terminations made... | https://2023.antflix.net#250.64(A) |
Chapter 2 Wiring and Protection | 250.64(B) | If exposed, a grounding electrode conductor or its enclosure shall be securely fastened to the surface on which it is carried. Grounding electrode conductors shall be permitted to be installed on or through framing members. [250.64(B)](https://2023.antflix.net#250.64(B)) | https://2023.antflix.net#250.64(B) |
Chapter 2 Wiring and Protection | 250.64(B)(1) | A 6 AWG or larger copper, copper-clad aluminum, or aluminum grounding electrode conductor not exposed to physical damage shall be permitted to be run along the surface of the building construction without metal covering or protection. [250.64(B)(1)](https://2023.antflix.net#250.64(B)(1)) | https://2023.antflix.net#250.64(B)(1) |
Chapter 2 Wiring and Protection | 250.64(B)(2) | A 6 AWG or larger copper, copper-clad aluminum, or aluminum grounding electrode conductor exposed to physical damage shall be protected in rigid metal conduit (RMC), intermediate metal conduit (IMG), Schedule 80 rigid polyvinyl chloride conduit (PVC), reinforced thermosetting resin conduit Type XW (RTRC-XW), electrical... | https://2023.antflix.net#250.64(B)(2) |
Chapter 2 Wiring and Protection | 250.64(B)(3) | Grounding electrode conductors smaller than 6 AWG shall be protected in RMC, IMC, Schedule 80 PVC, RTRC-XW, EMT, or cable armor. [250.64(B)(3)](https://2023.antflix.net#250.64(B)(3)) | https://2023.antflix.net#250.64(B)(3) |
Chapter 2 Wiring and Protection | 250.64(B)(4) | Grounding electrode conductors and grounding electrode bonding jumpers in contact with the earth shall not be required to comply with 300.5 or 305.15, but shall be buried or otherwise protected if subject to physical damage. [250.64(B)(4)](https://2023.antflix.net#250.64(B)(4)) | https://2023.antflix.net#250.64(B)(4) |
Chapter 2 Wiring and Protection | 250.64(C) | Except as provided in 250.30(A)(5) and (A)(6), 250.30(B)(1), and 250.68(C), grounding electrode conductor(s) shall be installed in one continuous length without a splice or joint. If necessary, splices or connections shall be made as permitted in the following: Splicing of the wire-type grounding electrode conductor sh... | https://2023.antflix.net#250.64(C) |
Chapter 2 Wiring and Protection | 250.64(D) | If a building or structure is supplied by a service or feeder with two or more disconnecting means in separate enclosures, the grounding electrode connections shall be made in accordance with 250.64(D)(1), (D)(2), or (D)(3). [250.64(D)](https://2023.antflix.net#250.64(D)) | https://2023.antflix.net#250.64(D) |
Chapter 2 Wiring and Protection | 250.64(D)(1) | A common grounding electrode conductor and grounding electrode conductor taps shall be installed. The common grounding electrode conductor shall be sized in accordance with 250.66, based on the sum of the circular mil area of the largest ungrounded conductor(s) of each set of conductors that supplies the disconnecting ... | https://2023.antflix.net#250.64(D)(1) |
Chapter 2 Wiring and Protection | 250.64(D)(2) | A grounding electrode conductor shall be connected between the grounding electrode system and one or more of the following, as applicable: Grounded conductor in each service equipment disconnecting means enclosureEquipment grounding conductor installed with the feeder(s) or branch circuit(s) for other than servicesSupp... | https://2023.antflix.net#250.64(D)(2) |
Chapter 2 Wiring and Protection | 250.64(D)(3) | A grounding electrode conductor shall be connected in a wireway or other accessible enclosure on the supply side of the disconnecting means to one or more of the following, as applicable: Grounded service conductor(s)Equipment grounding conductor installed with the feederSupply-side bonding jumperThe connection shall b... | https://2023.antflix.net#250.64(D)(3) |
Chapter 2 Wiring and Protection | 250.64(E)(1) | Ferrous metal raceways, enclosures, and cable armor for grounding electrode conductors shall be electrically continuous from the point of attachment to cabinets or equipment to the grounding electrode and shall be securely fastened to the ground clamp or fitting. Ferrous metal raceways, enclosures, and cable armor shal... | https://2023.antflix.net#250.64(E)(1) |
Chapter 2 Wiring and Protection | 250.64(E)(2) | Bonding shall be in compliance with 250.92(B) and ensured by one of the methods in 250.92(B)(2) through (B)(4). [250.64(E)(2)](https://2023.antflix.net#250.64(E)(2)) | https://2023.antflix.net#250.64(E)(2) |
Chapter 2 Wiring and Protection | 250.64(E)(3) | The bonding jumper for a grounding electrode conductor(s), raceway(s), enclosure(s), or cable armor shall be the same size as, or larger than, the largest enclosed grounding electrode conductor. [250.64(E)(3)](https://2023.antflix.net#250.64(E)(3)) | https://2023.antflix.net#250.64(E)(3) |
Chapter 2 Wiring and Protection | 250.64(E)(4) | If a raceway is used as protection for a grounding electrode conductor, the installation shall comply with the requirements of the applicable raceway article. [250.64(E)(4)](https://2023.antflix.net#250.64(E)(4)) | https://2023.antflix.net#250.64(E)(4) |
Chapter 2 Wiring and Protection | 250.64(F) | Grounding electrode conductor(s) and bonding jumpers interconnecting grounding electrodes shall be installed in accordance with one of the following. The grounding electrode conductor shall be sized for the largest grounding electrode conductor required among all the electrodes connected to it. The grounding electrode ... | https://2023.antflix.net#250.64(F) |
Chapter 2 Wiring and Protection | 250.64(G) | Grounding electrode conductors shall not be installed through a ventilation opening of an enclosure. [250.64(G)](https://2023.antflix.net#250.64(G)) | https://2023.antflix.net#250.64(G) |
Chapter 2 Wiring and Protection | 250.66 | The size of the grounding electrode conductor and bonding jumper(s) for connection of grounding electrodes shall not be smaller than given in Table 250.66, except as permitted in 250.66(A) through (C).Table 250.66 Grounding Electrode Conductor for Alternating-Current Systems Size of Largest Ungrounded Conductor or E... | https://2023.antflix.net#250.66 |
Chapter 2 Wiring and Protection | 250.66(A) | If the grounding electrode conductor or bonding jumper connected to a single or multiple rod, pipe, or plate electrode(s), or any combination thereof, as described in 250.52(A)(5) or (A)(7), does not extend on to other types of electrodes that require a larger size conductor, the grounding electrode conductor shall not... | https://2023.antflix.net#250.66(A) |
Chapter 2 Wiring and Protection | 250.66(B) | If the grounding electrode conductor or bonding jumper connected to a single or multiple concrete-encased electrode(s), as described in 250.52(A)(3), does not extend on to other types of electrodes that require a larger size of conductor, the grounding electrode conductor shall not be required to be larger than 4 AWG c... | https://2023.antflix.net#250.66(B) |
Chapter 2 Wiring and Protection | 250.66(C) | If the grounding electrode conductor or bonding jumper connected to a ground ring, as described in 250.52(A)(4), does not extend on to other types of electrodes that require a larger size of conductor, the grounding electrode conductor shall not be required to be larger than the conductor used for the ground ring. [250... | https://2023.antflix.net#250.66(C) |
Chapter 2 Wiring and Protection | 250.68 | The connection of a grounding electrode conductor at the service, at each building or structure where supplied by a feeder(s) or branch circuit(s), or at a separately derived system and associated bonding jumper(s) shall be made as specified 250.68(A) through (C). [250.68](https://2023.antflix.net#250.68) | https://2023.antflix.net#250.68 |
Chapter 2 Wiring and Protection | 250.68(A) | All mechanical elements used to terminate a grounding electrode conductor or bonding jumper to a grounding electrode shall be accessible. Exception No. 1: An encased or buried connection to a concrete-encased, driven, or buried grounding electrode shall not be required to be accessible. Exception No. 2: Exothermic or i... | https://2023.antflix.net#250.68(A) |
Chapter 2 Wiring and Protection | 250.68(B) | The connection of a grounding electrode conductor or bonding jumper to a grounding electrode shall be made in a manner that will ensure an effective grounding path. Where necessary to ensure the grounding path for a metal piping system used as a grounding electrode, bonding shall be provided around insulated joints and... | https://2023.antflix.net#250.68(B) |
Chapter 2 Wiring and Protection | 250.68(C) | Grounding electrode conductors and bonding jumpers shall be permitted to be connected at the following locations and used to extend the connection to an electrode(s): Interior metal water piping that is electrically continuous with a metal underground water pipe electrode and is located not more than 1.52 m (5 ft) from... | https://2023.antflix.net#250.68(C) |
Chapter 2 Wiring and Protection | 250.70(A) | The grounding or bonding conductor shall be connected to the grounding electrode by exothermic welding, listed lugs, listed pressure connectors, listed clamps, or other listed means. Connections depending on solder shall not be used. Ground clamps shall be listed for the materials of the grounding electrode and the gro... | https://2023.antflix.net#250.70(A) |
Chapter 2 Wiring and Protection | 250.70(B) | For indoor communications purposes only, a listed sheet metal strap-type ground clamp having a rigid metal base that seats on the electrode and having a strap of such material and dimensions that it is not likely to stretch during or after installation shall be permitted. Informational Note: Listed ground clamps that a... | https://2023.antflix.net#250.70(B) |
Chapter 2 Wiring and Protection | 250.80 | Metal enclosures and raceways for service conductors and equipment shall be connected to the grounded conductor if the electrical system is grounded or to the grounding electrode conductor for electrical systems that are not grounded. Exception: Metal components that are installed in a run of underground nonmetallic ra... | https://2023.antflix.net#250.80 |
Chapter 2 Wiring and Protection | 250.84(A) | The sheath or armor of a continuous underground metal-sheathed or armored service cable system that is connected to the grounded conductor on the supply side shall not be required to be connected to the grounded conductor at the building or structure. The sheath or armor shall be permitted to be insulated from the inte... | https://2023.antflix.net#250.84(A) |
Chapter 2 Wiring and Protection | 250.84(B) | An underground metal service raceway that contains a metal-sheathed or armored cable connected to the grounded conductor shall not be required to be connected to the grounded conductor at the building or structure. The sheath or armor shall be permitted to be insulated from the interior metal raceway or piping. [250.84... | https://2023.antflix.net#250.84(B) |
Chapter 2 Wiring and Protection | 250.86 | Except as permitted by 250.112(1), metal enclosures and raceways for other than service conductors shall be connected to the equipment grounding conductor. Exception No. 1: Metal enclosures and raceways for conductors added to existing installations of open wire, knob-and-tube wiring, and nonmetallic-sheathed cable sha... | https://2023.antflix.net#250.86 |
Chapter 2 Wiring and Protection | 250.90 | Bonding shall be provided if necessary to ensure electrical continuity and the capacity to conduct safely any fault current likely to be imposed. [250.90](https://2023.antflix.net#250.90) | https://2023.antflix.net#250.90 |
Chapter 2 Wiring and Protection | 250.92(A) | The normally noncurrent-carrying metal parts of equipment indicated in the following shall be bonded together: All raceways, cable trays, cablebus framework, auxiliary gutters, or service cable armor or sheath that enclose, contain, or support service conductors, except as permitted in 250.80All enclosures containing s... | https://2023.antflix.net#250.92(A) |
Chapter 2 Wiring and Protection | 250.92(B) | Bonding jumpers meeting the requirements of this article shall be used around impaired connections, such as reducing washers or oversized, concentric, or eccentric knockouts. Standard locknuts or bushings shall not be the only means for the bonding required by this section but shall be permitted to be installed to make... | https://2023.antflix.net#250.92(B) |
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