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Chapter 2 Wiring and Protection
|
225.40
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Where a feeder overcurrent device is not readily accessible, branch-circuit overcurrent devices shall be installed on the load side, shall be mounted in a readily accessible location, and shall be of a lower ampere rating than the feeder overcurrent device. [225.40](https://2023.antflix.net#225.40)
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https://2023.antflix.net#225.40
|
Chapter 2 Wiring and Protection
|
225.41
|
For one-and two-family dwelling units, an emergency disconnecting means shall be installed. [225.41](https://2023.antflix.net#225.41)
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https://2023.antflix.net#225.41
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Chapter 2 Wiring and Protection
|
225.41(A)(1)
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The disconnecting means shall be installed in a readily accessible outdoor location on or within sight of the dwelling unit. [225.41(A)(1)](https://2023.antflix.net#225.41(A)(1))
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https://2023.antflix.net#225.41(A)(1)
|
Chapter 2 Wiring and Protection
|
225.41(A)(2)
|
The disconnecting means shall have a short-circuit current rating equal to or greater than the available fault current. [225.41(A)(2)](https://2023.antflix.net#225.41(A)(2))
|
https://2023.antflix.net#225.41(A)(2)
|
Chapter 2 Wiring and Protection
|
225.41(A)(3)
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If more than one disconnecting means is provided, they shall be grouped. [225.41(A)(3)](https://2023.antflix.net#225.41(A)(3))
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https://2023.antflix.net#225.41(A)(3)
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Chapter 2 Wiring and Protection
|
225.41(B)
|
Where equipment for isolation of other energy source systems is not located adjacent to the emergency disconnect required by this section, a plaque or directory identifying the location of all equipment for isolation of other energy sources shall be located adjacent to the disconnecting means required by this section. Informational Note: See 445.18, 480.7, 705.20, and 706.15 for examples of other energy source system isolation means. [225.41(B)](https://2023.antflix.net#225.41(B))
|
https://2023.antflix.net#225.41(B)
|
Chapter 2 Wiring and Protection
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225.41(C)
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The disconnecting means shall be marked as EMERGENCY DISCONNECT. Markings shall comply with 110.21(B) and all of the following:The marking or labels shall be located on the outside front of the disconnect enclosure with red background and white text.The letters shall be least 13 mm (1/2 in.) high. [225.41(C)](https://2023.antflix.net#225.41(C))
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https://2023.antflix.net#225.41(C)
|
Chapter 2 Wiring and Protection
|
225.42(A)
|
Where a feeder supplies any of the following, a surge-protective device (SPD) shall be installed: Dwelling unitsDormitory unitsGuest rooms and guest suites of hotels and motelsAreas of nursing homes and limited-care facilities used exclusively as patient sleeping rooms [225.42(A)](https://2023.antflix.net#225.42(A))
|
https://2023.antflix.net#225.42(A)
|
Chapter 2 Wiring and Protection
|
225.42(B)
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The SPD shall be installed in or adjacent to the distribution equipment that is connected to the load side of the feeder and contains branch circuit overcurrent protective device(s) that supply the location specified in 225.42(A). Informational Note: Surge protection is most effective when closest to the branch circuit. Surges can be generated from multiple sources including, but not limited to, lightning, the electric utility, or utilization equipment. [225.42(B)](https://2023.antflix.net#225.42(B))
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https://2023.antflix.net#225.42(B)
|
Chapter 2 Wiring and Protection
|
225.42(C)
|
The SPD shall be a Type 1 or Type 2 SPD. [225.42(C)](https://2023.antflix.net#225.42(C))
|
https://2023.antflix.net#225.42(C)
|
Chapter 2 Wiring and Protection
|
225.42(D)
|
Where the distribution equipment supplied by the feeder is replaced, all of the requirements of this section shall apply. [225.42(D)](https://2023.antflix.net#225.42(D))
|
https://2023.antflix.net#225.42(D)
|
Chapter 2 Wiring and Protection
|
225.42(E)
|
SPDs shall have a nominal discharge current rating (In) of not less than 10kA. Informational Note: Lead lengths of conductors to the SPD should be kept as short as possible to reduce let-through voltages. [225.42(E)](https://2023.antflix.net#225.42(E))
|
https://2023.antflix.net#225.42(E)
|
Chapter 2 Wiring and Protection
|
230.1
|
This article covers service conductors and equipment for control and protection of services not over 1000 volts ac or 1500 volts dc, nominal and their installation requirements. Informational Note No. 1: See Informational Note Figure 230.1. Informational Note No. 2: See Part V of Article 235 for services over 1000 volts ac or 1500 volts dc, nominal. Informational Note Figure 230.1 Services. [230.1](https://2023.antflix.net#230.1)
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https://2023.antflix.net#230.1
|
Chapter 2 Wiring and Protection
|
230.2
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A building or other structure served shall be supplied by only one service unless permitted in 230.2(A) through (D). For the purpose of 230.40, Exception No. 2 only, underground sets of conductors, 1/0 AWG and larger, running to the same location and connected together at their supply end but not connected together at their load end shall be considered to be supplying one service. [230.2](https://2023.antflix.net#230.2)
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https://2023.antflix.net#230.2
|
Chapter 2 Wiring and Protection
|
230.2(A)
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Additional services shall be permitted to supply the following: Fire pumpsEmergency systemsLegally required standby systemsOptional standby systemsInterconnected electric power production sourcesSystems designed for connection to multiple sources of supply for the purpose of enhanced reliability [230.2(A)](https://2023.antflix.net#230.2(A))
|
https://2023.antflix.net#230.2(A)
|
Chapter 2 Wiring and Protection
|
230.2(B)
|
By special permission, additional services shall be permitted for either of the following: Multiple-occupancy buildings where there is no available space for service equipment accessible to all occupantsA single building or other structure sufficiently large to make two or more services necessary [230.2(B)](https://2023.antflix.net#230.2(B))
|
https://2023.antflix.net#230.2(B)
|
Chapter 2 Wiring and Protection
|
230.2(C)
|
Additional services shall be permitted under any of the following: Where the capacity requirements are in excess of 2000 amperes at a supply voltage of 1000 volts or lessWhere the load requirements of a single-phase installation are greater than the serving agency normally supplies through one serviceBy special permission [230.2(C)](https://2023.antflix.net#230.2(C))
|
https://2023.antflix.net#230.2(C)
|
Chapter 2 Wiring and Protection
|
230.2(D)
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Additional services shall be permitted for different voltages, frequencies, or phases, or for different uses, such as for different rate schedules. [230.2(D)](https://2023.antflix.net#230.2(D))
|
https://2023.antflix.net#230.2(D)
|
Chapter 2 Wiring and Protection
|
230.2(E)
|
Where a building or structure is supplied by more than one service, or any combination of branch circuits, feeders, and services, a permanent plaque or directory shall be installed at each service disconnect location denoting all other services, feeders, and branch circuits supplying that building or structure and the area served by each. See 225.37. [230.2(E)](https://2023.antflix.net#230.2(E))
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https://2023.antflix.net#230.2(E)
|
Chapter 2 Wiring and Protection
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230.3
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Service conductors supplying a building or other structure shall not pass through the interior of another building or other structure. [230.3](https://2023.antflix.net#230.3)
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https://2023.antflix.net#230.3
|
Chapter 2 Wiring and Protection
|
230.6
|
Conductors shall be considered outside of a building or other structure under any of the following conditions: Where installed under not less than 50 mm (2 in.) of concrete beneath a building or other structureWhere installed within a building or other structure in a raceway that is encased in concrete or brick not less than 50 mm (2 in.) thickWhere installed in any vault that meets the construction requirements of Part III of Article 450Where installed in conduit and under not less than 450 mm (18 in.) of earth beneath a building or other structureWhere installed within rigid metal conduit (RMC) or intermediate metal conduit (IMC) used to accommodate the clearance requirements in 230.24 and routed directly through an eave but not a wall of a building [230.6](https://2023.antflix.net#230.6)
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https://2023.antflix.net#230.6
|
Chapter 2 Wiring and Protection
|
230.7
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Circuit conductors other than service conductors, shall not be installed in the same raceway, cable, handhole enclosure, or underground box as the service conductors. Exception No. 1: Grounding electrode conductors or supply side bonding jumpers or conductors shall be permitted within service raceways. Exception No. 2: Load management control conductors having overcurrent protection shall be permitted within service raceways. [230.7](https://2023.antflix.net#230.7)
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https://2023.antflix.net#230.7
|
Chapter 2 Wiring and Protection
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230.8
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Where a service raceway enters a building or structure, it shall be sealed in accordance with 300.5(G) and 300.7(A). Spare or unused raceways shall also be sealed. Sealants shall be identified for use with the cable insulation, conductor insulation, bare conductor, shield, or other components. [230.8](https://2023.antflix.net#230.8)
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https://2023.antflix.net#230.8
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Chapter 2 Wiring and Protection
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230.9
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Service conductors and final spans shall comply with 230.9(A), (B), and (C). [230.9](https://2023.antflix.net#230.9)
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https://2023.antflix.net#230.9
|
Chapter 2 Wiring and Protection
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230.9(A)
|
Service conductors installed as open conductors or multiconductor cable without an overall outer jacket shall have a clearance of not less than 900 mm (3 ft) from windows that are designed to be opened, doors, porches, balconies, ladders, stairs, fire escapes, or similar locations. Exception: Conductors run above the top level of a window shall be permitted to be less than the 900 mm (3 ft) requirement. [230.9(A)](https://2023.antflix.net#230.9(A))
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https://2023.antflix.net#230.9(A)
|
Chapter 2 Wiring and Protection
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230.9(B)
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The vertical clearance of final spans above, or within 900 mm (3 ft) measured horizontally of platforms, projections, or surfaces that will permit personal contact shall be maintained in accordance with 230.24(B). [230.9(B)](https://2023.antflix.net#230.9(B))
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https://2023.antflix.net#230.9(B)
|
Chapter 2 Wiring and Protection
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230.9(C)
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Overhead service conductors shall not be installed beneath openings through which materials may be moved, such as openings in farm and commercial buildings, and shall not be installed where they obstruct entrance to these building openings. [230.9(C)](https://2023.antflix.net#230.9(C))
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https://2023.antflix.net#230.9(C)
|
Chapter 2 Wiring and Protection
|
230.10
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Vegetation such as trees shall not be used for support of overhead service conductors or service equipment. [230.10](https://2023.antflix.net#230.10)
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https://2023.antflix.net#230.10
|
Chapter 2 Wiring and Protection
|
230.22
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Individual conductors shall be insulated or covered. Exception: The grounded conductor of a multiconductor cable shall be permitted to be bare. [230.22](https://2023.antflix.net#230.22)
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https://2023.antflix.net#230.22
|
Chapter 2 Wiring and Protection
|
230.23(A)
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Conductors shall have sufficient ampacity to carry the current for the load as calculated in accordance with Parts II through V of Article 220 and shall have adequate mechanical strength. [230.23(A)](https://2023.antflix.net#230.23(A))
|
https://2023.antflix.net#230.23(A)
|
Chapter 2 Wiring and Protection
|
230.23(B)
|
The conductors shall not be smaller than 8 AWG copper or 6 AWG aluminum or copper-clad aluminum. Exception: Conductors supplying only limited loads of a single branch circuit - such as small polyphase power, controlled water healers, and similar loads - shall not be smaller than 12 AWG hard-drawn copper or equivalent. [230.23(B)](https://2023.antflix.net#230.23(B))
|
https://2023.antflix.net#230.23(B)
|
Chapter 2 Wiring and Protection
|
230.23(C)
|
The grounded conductor shall not be less than the minimum size as required by 250.24(D). [230.23(C)](https://2023.antflix.net#230.23(C))
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https://2023.antflix.net#230.23(C)
|
Chapter 2 Wiring and Protection
|
230.24
|
Overhead service conductors shall not be readily accessible and shall comply with 230.24(A) through (E) for services not over 1000 volts, nominal. [230.24](https://2023.antflix.net#230.24)
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https://2023.antflix.net#230.24
|
Chapter 2 Wiring and Protection
|
230.24(A)
|
Conductors shall have a vertical clearance of not less than 2.6 m (8 ft 6 in.) above the roof surface. The vertical clearance above the roof level shall be maintained for a distance of not less than 900 mm (3 ft) in all directions from the edge of the roof. Exception No. 1: The area above a roof surface subject to pedestrian or vehicular traffic shall have a vertical clearance from the roof surface in accordance with the clearance requirements of 230.24(B). Exception No. 2: Where the voltage between conductors does not exceed 300 and the roof has a slope of 100 mm in 300 mm (4 in. in 12 in.) or greater, a reduction in clearance to 900 mm (3 ft) shall be permitted. Exception No. 3: Where the voltage between conductors does not exceed 300, a reduction in clearance above only the overhanging portion of the roof to not less than 450 mm (18 in.) shall be permitted if (1) not more than 1.8 m (6 ft) of overhead service conductors, 1.2 m (4 ft) horizontally, pass above the roof overhang, and (2) they are terminated at a through-the-roof raceway or approved support. Informational Note: Sec 230.28 for mast supports. Exception No. 4: The requirement for maintaining the vertical clearance 900 mm (3 ft) from the edge of the roof shall not apply to the final conductor span where the service drop or overhead service conductors are attached to the side of a building. Exception No. 5: Where the voltage between conductors does not exceed 300 and the roof area is guarded or isolated, a reduction in clearance to 900 mm (3 ft) shall be permitted. [230.24(A)](https://2023.antflix.net#230.24(A))
|
https://2023.antflix.net#230.24(A)
|
Chapter 2 Wiring and Protection
|
230.24(B)
|
Overhead service conductors, where not in excess of 1000 volts, nominal, shall have the following minimum clearance from final grade: 3.0 m (10 ft) - at the electrical service entrance to buildings, also at the lowest point of the drip loop of the building electrical entrance, and above areas or sidewalks accessible only to pedestrians, measured from final grade or other accessible surface only for overhead service conductors supported on and cabled together with a grounded bare messenger where the voltage does not exceed 150 volts to ground3.7 m (12 ft) - over residential property and driveways, and those commercial areas not subject to truck traffic where the voltage does not exceed 300 volts to ground4.5 m (15 ft) - for those areas listed in the 3.7 m (12 ft) classification where the voltage exceeds 300 volts to ground5.5 m (18 ft) - over public streets, alleys, roads, parking areas subject to truck traffic, driveways on other than residential property, and other land such as cultivated, grazing, forest, and orchard7.5 m (241/2 ft) over tracks of railroads [230.24(B)](https://2023.antflix.net#230.24(B))
|
https://2023.antflix.net#230.24(B)
|
Chapter 2 Wiring and Protection
|
230.24(C)
|
Clearances from building openings shall comply with 230.9(C). [230.24(C)](https://2023.antflix.net#230.24(C))
|
https://2023.antflix.net#230.24(C)
|
Chapter 2 Wiring and Protection
|
230.24(D)
|
Clearances from swimming pools, fountains, and similar installations shall comply with 680.9. [230.24(D)](https://2023.antflix.net#230.24(D))
|
https://2023.antflix.net#230.24(D)
|
Chapter 2 Wiring and Protection
|
230.24(E)
|
Clearance from communication wires and cables shall be in accordance with 800.44(A)(4). [230.24(E)](https://2023.antflix.net#230.24(E))
|
https://2023.antflix.net#230.24(E)
|
Chapter 2 Wiring and Protection
|
230.26
|
The point of attachment of the overhead service conductors to a building or other structure shall provide the minimum clearances as specified in 230.9 and 230.24. In no case shall this point of attachment be less than 3.0 m (10 ft) above finished grade. [230.26](https://2023.antflix.net#230.26)
|
https://2023.antflix.net#230.26
|
Chapter 2 Wiring and Protection
|
230.27
|
Multiconductor cables used for overhead service conductors shall be attached to buildings or other structures by fittings identified for use with service conductors. Open conductors shall be attached to fittings identified for use with service conductors or to noncombustible, nonabsorbent insulators securely attached to the building or other structure. [230.27](https://2023.antflix.net#230.27)
|
https://2023.antflix.net#230.27
|
Chapter 2 Wiring and Protection
|
230.28
|
Only power service-drop or overhead service conductors shall be permitted to be attached to a service mast. Service masts used for the support of service-drop or overhead service conductors shall be installed in accordance with 230.28(A) and (B). [230.28](https://2023.antflix.net#230.28)
|
https://2023.antflix.net#230.28
|
Chapter 2 Wiring and Protection
|
230.28(A)
|
The service mast shall be of adequate strength or be supported by braces or guy wires to withstand safely the strain imposed by the service-drop or overhead service conductors. Hubs intended for use with a conduit that serves as a service mast shall be identified for use with service-entrance equipment. [230.28(A)](https://2023.antflix.net#230.28(A))
|
https://2023.antflix.net#230.28(A)
|
Chapter 2 Wiring and Protection
|
230.28(B)
|
Service-drop or overhead service conductors shall not be attached to a service mast between a weatherhead or the end of the conduit and a coupling, where the coupling is located above the last point of securement to the building or other structure or is located above the building or other structure. [230.28(B)](https://2023.antflix.net#230.28(B))
|
https://2023.antflix.net#230.28(B)
|
Chapter 2 Wiring and Protection
|
230.29
|
Service conductors passing over a roof shall be securely supported by substantial structures. For a grounded system, where the substantial structure is metal, it shall be bonded by means of a bonding jumper and listed connector to the grounded overhead service conductor. Where practicable, such supports shall be independent of the building. [230.29](https://2023.antflix.net#230.29)
|
https://2023.antflix.net#230.29
|
Chapter 2 Wiring and Protection
|
230.30(A)
|
Underground service conductors shall be insulated for the applied voltage. Exception: A grounded conductor shall be permitted to be uninsulated as follows: (1) Bare copper used in a raceway (2) Bare copper for direct burial where bare copper is approved for the soil conditions (3) Bare copper for direct burial without regard to soil conditions where part of a cable assembly identified for underground use (4) Aluminum or copper-clad aluminum without individual insulation or covering where part of a cable assembly identified for underground use in a raceway or for direct burial [230.30(A)](https://2023.antflix.net#230.30(A))
|
https://2023.antflix.net#230.30(A)
|
Chapter 2 Wiring and Protection
|
230.30(B)
|
Underground service conductors shall be installed in accordance with the applicable requirements of this Code covering the type of wiring method used and shall be limited to the following methods: RMC conduitIMC conduitType NUCC conduitHDPE conduitPVC conduitRTRC conduitType IGS cableType USE conductors or cablesType MV or Type MC cable identified for direct burial applicationsType MI cable where suitably protected against physical damage and corrosive conditionsType TC-ER cable where identified for service entrance use and direct burial applications [230.30(B)](https://2023.antflix.net#230.30(B))
|
https://2023.antflix.net#230.30(B)
|
Chapter 2 Wiring and Protection
|
230.31(A)
|
Underground service conductors shall have sufficient ampacity to carry the current for the load as calculated in accordance with Parts II through V of Article 220. [230.31(A)](https://2023.antflix.net#230.31(A))
|
https://2023.antflix.net#230.31(A)
|
Chapter 2 Wiring and Protection
|
230.31(B)
|
The conductors shall not be smaller than 8 AWG copper or 6 AWG aluminum or copper-clad aluminum. Exception: Conductors supplying only limited loads of a single branch circuit - such as small polyphase power, controlled water heaters, and similar loads - shall not be smaller than 12 AWG copper or 10 AWG aluminum or copper-clad aluminum. [230.31(B)](https://2023.antflix.net#230.31(B))
|
https://2023.antflix.net#230.31(B)
|
Chapter 2 Wiring and Protection
|
230.31(C)
|
The grounded conductor shall not be smaller than the minimum size required by 250.24(D). [230.31(C)](https://2023.antflix.net#230.31(C))
|
https://2023.antflix.net#230.31(C)
|
Chapter 2 Wiring and Protection
|
230.32
|
Underground service conductors shall be protected against damage in accordance with 300.5. Service conductors entering a building or other structure shall be installed in accordance with 230.6 or protected by a raceway wiring method identified in 230.43. [230.32](https://2023.antflix.net#230.32)
|
https://2023.antflix.net#230.32
|
Chapter 2 Wiring and Protection
|
230.33
|
Service conductors shall be permitted to be spliced or tapped in accordance with 110.14, 230.46, 300.5(E), 300.13, and 300.15. [230.33](https://2023.antflix.net#230.33)
|
https://2023.antflix.net#230.33
|
Chapter 2 Wiring and Protection
|
230.40
|
Each service drop, set of overhead service conductors, set of underground service conductors, or service lateral shall supply only one set of service-entrance conductors. Exception No. 1: A building with more than one occupancy shall be permitted to have one set of service-entrance conductors for each service, as permitted in 230.2, run to each occupancy or group of occupancies. If the number of service disconnect locations for any given classification of service does not exceed six, the requirements of 230.2(E) shall apply at each location. If the number of service disconnect locations exceeds six for any given supply classification, the following conditions shall apply: (1) All service disconnect locations for all supply characteristics, together with any branch circuit or feeder supply sources, shall be clearly described using graphics or text, or both, on one or more plaques (2) The plaques shall be located in an approved, readily accessible location(s) on the building or structure served and as near as practicable to the point(s) of attachment or entry(ies) for each service drop or service lateral and for each set of overhead or underground service conductors. Exception No. 2: Where two to six service disconnecting means in separate enclosures are grouped at one location and supply separate loads from one service drop, set of overhead service conductors, set of underground service conductors, or service lateral, one set of service-entrance conductors shall be permitted to supply each or several such service equipment enclosures. Exception No. 3: A one-family dwelling unit and its accessory structures shall be permitted to have one set of service-entrance conductors run to each from a single service drop, set of overhead service conductors, set of underground service conductors, or service lateral. Exception No. 4: Two-family dwellings, multifamily dwellings, and multiple occupancy buildings shall be permitted to have one set of service-entrance conductors installed to supply the circuits covered in 210.25. Exception No. 5: One set of service-entrance conductors connected to the supply side of the normal service disconnecting means shall be permitted to supply each or several systems covered by 230.82(5) or 230.82(6). [230.40](https://2023.antflix.net#230.40)
|
https://2023.antflix.net#230.40
|
Chapter 2 Wiring and Protection
|
230.41
|
Service-entrance conductors entering or on the exterior of buildings or other structures shall be insulated. Exception: A grounded conductor shall be permitted to be uninsulated as follows: (1) Bare copper used in a raceway or part of a service cable assembly (2) Bare copper for direct burial where bare copper is approved for the soil conditions (3) Bare copper for direct burial without regard to soil conditions where part of a cable assembly identified for underground use (4) Aluminum or copper-clad aluminum without individual insulation or covering where part of a cable assembly or identified for underground use in a raceway, or for direct burial (5) Bare conductors used in an auxiliary gutter [230.41](https://2023.antflix.net#230.41)
|
https://2023.antflix.net#230.41
|
Chapter 2 Wiring and Protection
|
230.42(A)
|
Service-entrance conductors shall have an ampacity of not less than the maximum load to be served. Conductors shall be sized not less than the largest of 230.42(A)(1) or (A)(2). Loads shall be determined in accordance with Part III, IV, or V of Article 220, as applicable. Ampacity shall be determined from 310.14 and shall comply with 110.14(C). The maximum current of busways shall be that value for which the busway has been listed or labeled. Informational Note: See UL 857, Standard for Safety for Busways, for information on busways. [230.42(A)](https://2023.antflix.net#230.42(A))
|
https://2023.antflix.net#230.42(A)
|
Chapter 2 Wiring and Protection
|
230.42(A)(1)
|
Where the service-entrance conductors supply continuous loads or any combination of noncontinuous and continuous loads, the minimum service-entrance conductor size shall have an ampacity not less than the sum of the noncontinuous loads plus 125 percent of continuous loads. Exception No. 1: Grounded conductors that are not connected to an overcurrent device shall be permitted to be sized at 100 percent of the sum of the continuous and noncontinuous load. Exception No. 2: The sum of the noncontinuous load and the continuous load if the service-entrance conductors terminate in an overcurrent device where both the overcurrent device and its assembly are listed for operation at 100 percent of their rating shall be permitted. [230.42(A)(1)](https://2023.antflix.net#230.42(A)(1))
|
https://2023.antflix.net#230.42(A)(1)
|
Chapter 2 Wiring and Protection
|
230.42(A)(2)
|
The minimum service-entrance conductor size shall have an ampacity not less than the maximum load to be served after the application of any adjustment or correction factors. [230.42(A)(2)](https://2023.antflix.net#230.42(A)(2))
|
https://2023.antflix.net#230.42(A)(2)
|
Chapter 2 Wiring and Protection
|
230.42(B)
|
In addition to the requirements of 230.42(A), the minimum ampacity for ungrounded conductors for specific installations shall not be less than the rating of the service disconnecting means specified in 230.79(A) through (D). [230.42(B)](https://2023.antflix.net#230.42(B))
|
https://2023.antflix.net#230.42(B)
|
Chapter 2 Wiring and Protection
|
230.42(C)
|
The grounded conductor shall not be smaller than the minimum size as required by 250.24(D). [230.42(C)](https://2023.antflix.net#230.42(C))
|
https://2023.antflix.net#230.42(C)
|
Chapter 2 Wiring and Protection
|
230.43
|
Service-entrance conductors shall be installed in accordance with the applicable requirements of this Code covering the type of wiring method used and shall be limited to the following methods: Open wiring on insulatorsType IGS cableRigid metal conduit (RMC)Intermediate metal conduit (IMC)Electrical metallic tubing (EMT)Electrical nonmetallic tubingService-entrance cablesWirewaysBuswaysAuxiliary guttersRigid polyvinyl chloride conduit (PVC)CablebusType MC cableMineral-insulated, metal-sheathed cable, Type MIFlexible metal conduit (FMC) not over 1.8 m (6 ft) long or liquidtight flexible metal conduit (LFMC) not over 1.8 m (6 ft) long between a raceway, or between a raceway and service equipment, with a supply-side bonding jumper routed with the flexible metal conduit (FMC) or the liquidtight flexible metal conduit (LFMC) according to 250.102(A), (B), (C), and (E)Liquidtight flexible nonmetallic conduit (LFNC)High density polyethylene conduit (HDPE)Nonmetallic underground conduit with conductors (NUCC)Reinforced thermosetting resin conduit (RTRC)Type TC-ER cable where identified for use as service entrance conductorsFlexible bus systems [230.43](https://2023.antflix.net#230.43)
|
https://2023.antflix.net#230.43
|
Chapter 2 Wiring and Protection
|
230.44
|
Cable tray systems shall be permitted to support service-entrance conductors. Cable trays used to support service-entrance conductors shall contain only service-entrance conductors and shall be limited to the following methods: Type SE cableType MC cableType MI cableType IGS cableSingle conductors 1/0 and larger that are listed for use in cable trayType TC-ER cableSuch cable trays shall be identified with permanently affixed labels with the wording "Service-Entrance Conductors." The labels shall be located so as to be visible after installation with a spacing not to exceed 3 m (10 ft) so that the service-entrance conductors are able to be readily traced through the entire length of the cable tray.Exception: Conductors, other than service-entrance conductors, shall be permitted to be installed in a cable tray with service-entrance conductors, provided a solid fixed barrier identified for use with the cable tray is installed to separate the service-entrance conductors from other conductors installed in the cable tray. [230.44](https://2023.antflix.net#230.44)
|
https://2023.antflix.net#230.44
|
Chapter 2 Wiring and Protection
|
230.46
|
Service-entrance conductors shall be permitted to be spliced or tapped in accordance with 110.14, 300.5(E), 300.13, and 300.15. Power distribution blocks, pressure connectors, and devices for splices and taps shall be listed. Power distribution blocks installed on service conductors shall be marked "suitable for use on the line side of the service equipment" or equivalent. Pressure connectors and devices for splices and taps installed on service conductors shall be marked "suitable for use on the line side of the service equipment" or equivalent. [230.46](https://2023.antflix.net#230.46)
|
https://2023.antflix.net#230.46
|
Chapter 2 Wiring and Protection
|
230.50(A)
|
Underground service-entrance conductors shall be protected against physical damage in accordance with 300.5. [230.50(A)](https://2023.antflix.net#230.50(A))
|
https://2023.antflix.net#230.50(A)
|
Chapter 2 Wiring and Protection
|
230.50(B)
|
All other service-entrance conductors, other than underground service entrance conductors, shall be protected against physical damage as specified in 230.50(B)(1) or (B)(2). [230.50(B)](https://2023.antflix.net#230.50(B))
|
https://2023.antflix.net#230.50(B)
|
Chapter 2 Wiring and Protection
|
230.50(B)(1)
|
Service-entrance cables, where subject to physical damage, shall be protected by any of the following: Rigid metal conduit (RMC)Intermediate metal conduit (IMC)Schedule 80 PVC conduitElectrical metallic tubing (EMT)Reinforced thermosetting resin conduit (RTRC)Other approved means [230.50(B)(1)](https://2023.antflix.net#230.50(B)(1))
|
https://2023.antflix.net#230.50(B)(1)
|
Chapter 2 Wiring and Protection
|
230.50(B)(2)
|
Individual open conductors and cables, other than service-entrance cables, shall not be installed within 3.0 m (10 ft) of grade level or where exposed to physical damage. Exception: Type MI and Type MC cable shall be permitted within 3.0 m (10 ft) of grade level where not exposed to physical damage or where protected in accordance with 300.5(D). [230.50(B)(2)](https://2023.antflix.net#230.50(B)(2))
|
https://2023.antflix.net#230.50(B)(2)
|
Chapter 2 Wiring and Protection
|
230.51
|
Service-entrance cables or individual open service-entrance conductors shall be supported as specified in 230.51 (A), (B), or (C). [230.51](https://2023.antflix.net#230.51)
|
https://2023.antflix.net#230.51
|
Chapter 2 Wiring and Protection
|
230.51(A)
|
Service-entrance cables shall be supported by straps or other approved means within 300 mm (12 in.) of every service head, gooseneck, or connection to a raceway or enclosure and at intervals not exceeding 750 mm (30 in.). [230.51(A)](https://2023.antflix.net#230.51(A))
|
https://2023.antflix.net#230.51(A)
|
Chapter 2 Wiring and Protection
|
230.51(B)
|
Cables that are not approved for mounting in contact with a building or other structure shall be mounted on insulating supports installed at intervals not exceeding 4.5 m (15 ft) and in a manner that maintains a clearance of not less than 50 mm (2 in.) from the surface over which they pass. [230.51(B)](https://2023.antflix.net#230.51(B))
|
https://2023.antflix.net#230.51(B)
|
Chapter 2 Wiring and Protection
|
230.51(C)
|
Individual open conductors shall be installed in accordance with Table 230.51(C). Where exposed to the weather, the conductors shall be mounted on insulators or on insulating supports attached to racks, brackets, or other approved means. Where not exposed to the weather, the conductors shall be mounted on glass or porcelain knobs. Table 230.51 (C) Supports Maximum Volts Maximum Distance Between Supports Minimum Clearance Between Conductors From Surface m ft mm in. mm in. 1000 2.7 9 150 6 50 2 1000 4.5 15 300 12 50 2 300 1.4 41/2 75 3 50 2 1000* 1.4* 41/2* 65* 21/2* 25* 1* *Where not exposed to weather. [230.51(C)](https://2023.antflix.net#230.51(C))
|
https://2023.antflix.net#230.51(C)
|
Chapter 2 Wiring and Protection
|
230.52
|
Where individual open conductors enter a building or other structure, they shall enter through roof bushings or through the wall in an upward slant through individual, noncombustible, nonabsorbent insulating tubes. Drip loops shall be formed on the conductors before they enter the tubes. [230.52](https://2023.antflix.net#230.52)
|
https://2023.antflix.net#230.52
|
Chapter 2 Wiring and Protection
|
230.53
|
Where exposed to the weather, raceways enclosing service-entrance conductors shall be listed or approved for use in wet locations and arranged to drain. Where embedded in masonry, raceways shall be arranged to drain. [230.53](https://2023.antflix.net#230.53)
|
https://2023.antflix.net#230.53
|
Chapter 2 Wiring and Protection
|
230.54(A)
|
Service raceways shall be equipped with a service head at the point of connection to service-drop or overhead service conductors. The service head shall be listed for use in wet locations. [230.54(A)](https://2023.antflix.net#230.54(A))
|
https://2023.antflix.net#230.54(A)
|
Chapter 2 Wiring and Protection
|
230.54(B)
|
Service-entrance cables shall be equipped with a service head. The service head shall be listed for use in wet locations. Exception: Type SE cable shall be permitted to be formed in a gooseneck and taped with a self-sealing weather-resistant thermoplastic. [230.54(B)](https://2023.antflix.net#230.54(B))
|
https://2023.antflix.net#230.54(B)
|
Chapter 2 Wiring and Protection
|
230.54(C)
|
Service heads on raceways or service-entrance cables and goosenecks in service-entrance cables shall be located above the point of attachment of the service-drop or overhead service conductors to the building or other structure. Exception: Where it is impracticable to locate the service head or gooseneck above the point of attachment, the service head or gooseneck location shall be permitted not farther than 600 mm (24 in.) from the point of attachment. [230.54(C)](https://2023.antflix.net#230.54(C))
|
https://2023.antflix.net#230.54(C)
|
Chapter 2 Wiring and Protection
|
230.54(D)
|
Service-entrance cables shall be held securely in place. [230.54(D)](https://2023.antflix.net#230.54(D))
|
https://2023.antflix.net#230.54(D)
|
Chapter 2 Wiring and Protection
|
230.54(E)
|
Service heads shall have conductors of different potential brought out through separately bushed openings. Exception: For jacketed multiconductor service-entrance cable without splice. [230.54(E)](https://2023.antflix.net#230.54(E))
|
https://2023.antflix.net#230.54(E)
|
Chapter 2 Wiring and Protection
|
230.54(F)
|
Drip loops shall be formed on individual conductors. To prevent the entrance of moisture, service-entrance conductors shall be connected to the service-drop or overhead service conductors either (1) below the level of the service head or (2) below the level of the termination of the service-entrance cable sheath. [230.54(F)](https://2023.antflix.net#230.54(F))
|
https://2023.antflix.net#230.54(F)
|
Chapter 2 Wiring and Protection
|
230.54(G)
|
Service-entrance and overhead service conductors shall be arranged so that water will not enter service raceway or equipment. [230.54(G)](https://2023.antflix.net#230.54(G))
|
https://2023.antflix.net#230.54(G)
|
Chapter 2 Wiring and Protection
|
230.56
|
On a 4-wire, delta-connected service where the midpoint of one phase winding is grounded, the service conductor having the higher phase voltage to ground shall be durably and permanently marked by an outer finish that is orange in color, or by other effective means, at each termination or junction point. [230.56](https://2023.antflix.net#230.56)
|
https://2023.antflix.net#230.56
|
Chapter 2 Wiring and Protection
|
230.62
|
Energized parts of service equipment shall be enclosed as specified in 230.62(A) or guarded as specified in 230.62(B). [230.62](https://2023.antflix.net#230.62)
|
https://2023.antflix.net#230.62
|
Chapter 2 Wiring and Protection
|
230.62(A)
|
Energized parts shall be enclosed so that they will not be exposed to accidental contact or shall be guarded as in 230.62(B). [230.62(A)](https://2023.antflix.net#230.62(A))
|
https://2023.antflix.net#230.62(A)
|
Chapter 2 Wiring and Protection
|
230.62(B)
|
Energized parts that are not enclosed shall be installed on a switchboard, panelboard, or control board and guarded in accordance with 110.18 and 110.27. Where energized parts are guarded as provided in 110.27(A)(1) and (A)(2), a means for locking or sealing doors providing access to energized parts shall be provided. [230.62(B)](https://2023.antflix.net#230.62(B))
|
https://2023.antflix.net#230.62(B)
|
Chapter 2 Wiring and Protection
|
230.62(C)
|
Barriers shall be placed in service equipment such that no uninsulated, ungrounded service busbar or service terminal is exposed to inadvertent contact by persons or maintenance equipment while servicing load terminations with the service disconnect in the open position. [230.62(C)](https://2023.antflix.net#230.62(C))
|
https://2023.antflix.net#230.62(C)
|
Chapter 2 Wiring and Protection
|
230.66(A)
|
Service equipment rated at 1000 volts or less shall be marked to identify it as being suitable for use as service equipment. All service equipment shall be listed or field evaluated. [230.66(A)](https://2023.antflix.net#230.66(A))
|
https://2023.antflix.net#230.66(A)
|
Chapter 2 Wiring and Protection
|
230.66(B)
|
Meter sockets shall not be considered service equipment but shall be listed and rated for the voltage and current rating of the service. Exception: Meter sockets supplied by and under the exclusive control of an electric utility shall not be required to be listed. [230.66(B)](https://2023.antflix.net#230.66(B))
|
https://2023.antflix.net#230.66(B)
|
Chapter 2 Wiring and Protection
|
230.67(A)
|
All services supplying the following occupancies shall be provided with a surge-protective device (SPD): Dwelling unitsDormitory unitsGuest rooms and guest suites of hotels and motelsAreas of nursing homes and limited-care facilities used exclusively as patient sleeping roomsInformational Note: See 517.10(B)(2). [230.67(A)](https://2023.antflix.net#230.67(A))
|
https://2023.antflix.net#230.67(A)
|
Chapter 2 Wiring and Protection
|
230.67(B)
|
The SPD shall be an integral part of the service equipment or shall be located immediately adjacent thereto. Exception: The SPD shall not be required to be located at the service equipment as required in 230.67(B) if located at each next level distribution equipment downstream toward the load. [230.67(B)](https://2023.antflix.net#230.67(B))
|
https://2023.antflix.net#230.67(B)
|
Chapter 2 Wiring and Protection
|
230.67(C)
|
The SPD shall be a Type 1 or Type 2 SPD. [230.67(C)](https://2023.antflix.net#230.67(C))
|
https://2023.antflix.net#230.67(C)
|
Chapter 2 Wiring and Protection
|
230.67(D)
|
Where service equipment is replaced, all of the requirements of this section shall apply. [230.67(D)](https://2023.antflix.net#230.67(D))
|
https://2023.antflix.net#230.67(D)
|
Chapter 2 Wiring and Protection
|
230.67(E)
|
SPDs shall have a nominal discharge current rating (In) of not less than 10kA. [230.67(E)](https://2023.antflix.net#230.67(E))
|
https://2023.antflix.net#230.67(E)
|
Chapter 2 Wiring and Protection
|
230.70
|
Means shall be provided to disconnect all ungrounded conductors in a building or other structure from the service conductors. [230.70](https://2023.antflix.net#230.70)
|
https://2023.antflix.net#230.70
|
Chapter 2 Wiring and Protection
|
230.70(A)
|
The service disconnecting means shall be installed in accordance with 230.70(A)(1), (A)(2), and (A)(3). [230.70(A)](https://2023.antflix.net#230.70(A))
|
https://2023.antflix.net#230.70(A)
|
Chapter 2 Wiring and Protection
|
230.70(A)(1)
|
The service disconnecting means shall be installed at a readily accessible location either outside of a building or structure or inside nearest the point of entrance of the service conductors. [230.70(A)(1)](https://2023.antflix.net#230.70(A)(1))
|
https://2023.antflix.net#230.70(A)(1)
|
Chapter 2 Wiring and Protection
|
230.70(A)(2)
|
Service disconnecting means shall not be installed in bathrooms. [230.70(A)(2)](https://2023.antflix.net#230.70(A)(2))
|
https://2023.antflix.net#230.70(A)(2)
|
Chapter 2 Wiring and Protection
|
230.70(A)(3)
|
Where a remote control device(s) is used to actuate the service disconnecting means, the service disconnecting means shall be located in accordance with 230.70(A)(1). [230.70(A)(3)](https://2023.antflix.net#230.70(A)(3))
|
https://2023.antflix.net#230.70(A)(3)
|
Chapter 2 Wiring and Protection
|
230.70(B)
|
Each service disconnect shall be permanently marked to identify it as a service disconnect. [230.70(B)](https://2023.antflix.net#230.70(B))
|
https://2023.antflix.net#230.70(B)
|
Chapter 2 Wiring and Protection
|
230.70(C)
|
Each service disconnecting means shall be suitable for the prevailing conditions. Service equipment installed in hazardous (classified) locations shall comply with the hazardous location requirements. [230.70(C)](https://2023.antflix.net#230.70(C))
|
https://2023.antflix.net#230.70(C)
|
Chapter 2 Wiring and Protection
|
230.71
|
Each service shall have only one disconnecting means unless the requirements of 230.71 (B) are met. [230.71](https://2023.antflix.net#230.71)
|
https://2023.antflix.net#230.71
|
Chapter 2 Wiring and Protection
|
230.71(A)
|
For the purpose of this section, disconnecting means installed as part of listed equipment and used solely for the following shall not be considered a service disconnecting means: Power monitoring equipmentSurge-protective device(s)Control circuit of the ground-fault protection systemPower-operable service disconnecting means [230.71(A)](https://2023.antflix.net#230.71(A))
|
https://2023.antflix.net#230.71(A)
|
Chapter 2 Wiring and Protection
|
230.71(B)
|
Two to six service disconnects shall be permitted for each service permitted by 230.2 or for each set of service-entrance conductors permitted by 230.40, Exception No. 1, 3, 4, or 5. The two to six service disconnecting means shall be permitted to consist of a combination of any of the following: Separate enclosures with a main service disconnecting means in each enclosurePanelboards with a main service disconnecting means in each panelboard enclosureSwitchboard(s) where there is only one service disconnect in each separate vertical section with barriers provided between each vertical section to maintain the inadvertent contact protection required in 230.62 based on access from the adjacent section(s)Service disconnects in switchgear, transfer switches, or metering centers where each disconnect is located in a separate compartmentMetering centers with a main service disconnecting means in each metering centerMotor control center(s) where there is only one service disconnect in a motor control center unit and a maximum of two service disconnects provided in a single motor control center with barriers provided between each motor control center unit or compartment containing a service disconnect to maintain the inadvertent contact protection required in 230.62 based on access from adjacent motor control center unit(s) or compartment(s)Exception to (2), (3), (4), (5), and (6): Existing service equipment, installed in compliance with previous editions of this Code that permitted multiple service disconnecting means in a single enclosure, section, or compartment, shall be permitted to contain a maximum of six service disconnecting means.Informational Note No. 1: See UL 67, Standard for Panelboards, for information on metering centers.Informational Note No. 2: Examples of separate enclosures with a main service disconnecting means in each enclosure include but are not limited to motor control centers, fused disconnects, and circuit breaker enclosures.Informational Note No. 3: Transfer switches are provided with one service disconnect or multiple service disconnects in separate compartments. [230.71(B)](https://2023.antflix.net#230.71(B))
|
https://2023.antflix.net#230.71(B)
|
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