anthonymeo/NEC-csv · Datasets at Hugging Face

Chapter 2 Wiring and Protection

230.72(A)

The two to six disconnects, if permitted in 230.71, shall be grouped. Each disconnect shall be marked to indicate the load served. Exception: One of the two to six service disconnecting means permitted in 230.71, where used only for a water pump also intended to provide fire protection, shall be permitted to be located remote from the other disconnecting means. If remotely installed in accordance with this exception, a plaque shall be posted at the location of the remaining grouped disconnects denoting its location. [230.72(A)](https://2023.antflix.net#230.72(A))

https://2023.antflix.net#230.72(A)

Chapter 2 Wiring and Protection

230.72(B)

The one or more additional service disconnecting means for fire pumps, emergency systems, legally required standby, or optional standby services permitted by 230.2 shall be installed remote from the one to six service disconnecting means for normal service to minimize the possibility of simultaneous interruption of supply. [230.72(B)](https://2023.antflix.net#230.72(B))

https://2023.antflix.net#230.72(B)

Chapter 2 Wiring and Protection

230.72(C)

In a multiple-occupancy building, each occupant shall have access to the occupant's service disconnecting means. Exception: In a multiple-occupancy building where electric service and electrical maintenance are provided by the building management and where these are under continuous building management supervision, the service disconnecting means supplying more than one occupancy shall be permitted to be accessible to authorized management personnel only. [230.72(C)](https://2023.antflix.net#230.72(C))

https://2023.antflix.net#230.72(C)

Chapter 2 Wiring and Protection

230.74

Each service disconnect shall simultaneously disconnect all ungrounded service conductors that it controls from the premises wiring system. [230.74](https://2023.antflix.net#230.74)

https://2023.antflix.net#230.74

Chapter 2 Wiring and Protection

230.75

Where the service disconnecting means does not disconnect the grounded conductor from the premises wiring, other means shall be provided for this purpose in the service equipment. A terminal or bus to which all grounded conductors can be attached by means of pressure connectors shall be permitted for this purpose. In a multisection switchboard or switchgear, disconnects for the grounded conductor shall be permitted to be in any section of the switchboard or switchgear, if the switchboard or switchgear section is marked to indicate a grounded conductor disconnect is located within. Informational Note: In switchgear or multisection switchboards, the disconnecting means provided for the grounded conductor is typically identified as a neutral disconnect link and is typically located in the bus to which the service grounded conductor is connected. [230.75](https://2023.antflix.net#230.75)

https://2023.antflix.net#230.75

Chapter 2 Wiring and Protection

230.76

The service disconnecting means for ungrounded service conductors shall consist of one of the following: A manually operable switch or circuit breaker equipped with a handle or other suitable operating meansA power-operated switch or circuit breaker, provided the switch or circuit breaker can be opened by hand in the event of a power supply failure [230.76](https://2023.antflix.net#230.76)

https://2023.antflix.net#230.76

Chapter 2 Wiring and Protection

230.77

The service disconnecting means shall plainly indicate whether it is in the open (off) or closed (on) position. [230.77](https://2023.antflix.net#230.77)

https://2023.antflix.net#230.77

Chapter 2 Wiring and Protection

230.79

The service disconnecting means shall have a rating not less than the calculated load to be carried, determined in accordance with Part III, IV, or V of Article 220, as applicable. In no case shall the rating be lower than specified in 230.79(A), (B), (C), or (D). [230.79](https://2023.antflix.net#230.79)

https://2023.antflix.net#230.79

Chapter 2 Wiring and Protection

230.79(A)

For installations to supply only limited loads of a single branch circuit, the service disconnecting means shall have a rating of not less than 15 amperes. [230.79(A)](https://2023.antflix.net#230.79(A))

https://2023.antflix.net#230.79(A)

Chapter 2 Wiring and Protection

230.79(B)

For installations consisting of not more than two 2-wire branch circuits, the service disconnecting means shall have a rating of not less than 30 amperes. [230.79(B)](https://2023.antflix.net#230.79(B))

https://2023.antflix.net#230.79(B)

Chapter 2 Wiring and Protection

230.79(C)

For a one-family dwelling, the service disconnecting means shall have a rating of not less than 100 amperes, 3-wire. [230.79(C)](https://2023.antflix.net#230.79(C))

https://2023.antflix.net#230.79(C)

Chapter 2 Wiring and Protection

230.79(D)

For all other installations, the service disconnecting means shall have a rating of not less than 60 amperes. [230.79(D)](https://2023.antflix.net#230.79(D))

https://2023.antflix.net#230.79(D)

Chapter 2 Wiring and Protection

230.80

Where the service disconnecting means consists of more than one switch or circuit breaker, as permitted by 230.71, the combined ratings of all the switches or circuit breakers used shall not be less than the rating required by 230.79. [230.80](https://2023.antflix.net#230.80)

https://2023.antflix.net#230.80

Chapter 2 Wiring and Protection

230.81

The service conductors shall be connected to the service disconnecting means by pressure connectors, clamps, or other approved means. Connections that depend on solder shall not be used. [230.81](https://2023.antflix.net#230.81)

https://2023.antflix.net#230.81

Chapter 2 Wiring and Protection

230.82

Only the following equipment shall be permitted to be connected to the supply side of the service disconnecting means: Cable limiters.Meters and meter sockets nominally rated not in excess of 1000 volts, if all metal housings and service enclosures are grounded in accordance with Part VII and bonded in accordance with Part V of Article 250.Meter disconnect switches nominally rated not in excess of 1000 volts that have a short-circuit current rating equal to or greater than the available fault current, if all metal housings and service enclosures are grounded in accordance with Part VII and bonded in accordance with Part V of Article 250. A meter disconnect switch shall be capable of interrupting the load served. A meter disconnect shall be legibly field marked on its exterior in a manner suitable for the environment as follows:METER DISCONNECT NOT SERVICE EQUIPMENTInstrument transformers (current and voltage), impedance shunts, load management devices, surge arresters, and Type 1 surge-protective devices.Conductors used to supply energy management systems, circuits for standby power systems, fire pump equipment, and fire and sprinkler alarms, if provided with service equipment and installed in accordance with requirements for service-entrance conductors.Solar photovoltaic systems, fuel cell systems, wind electric systems, energy storage systems, or interconnected electric power production sources, if provided with a disconnecting means listed as suitable for use as service equipment, and overcurrent protection as specified in Part VII of Article 230.Control circuits for power-operable service disconnecting means, if suitable overcurrent protection and disconnecting means are provided.Ground-fault protection systems or Type 2 surge-protective devices, where installed as part of listed equipment, if suitable overcurrent protection and disconnecting means are provided.Connections used only to supply listed communications equipment under the exclusive control of the serving electric utility, if suitable overcurrent protection and disconnecting means are provided. For installations of equipment by the serving electric utility, a disconnecting means is not required if the supply is installed as part of a meter socket, such that access can only be gained with the meter removed.Emergency disconnects in accordance with 230.85(B)(2) and (B)(3), if all metal housings and enclosures are grounded in accordance with Part VII and bonded in accordance with Part V of Article 250.Meter-mounted transfer switches nominally rated not in excess of 1000 volts that have a short-circuit current rating equal to or greater than the available fault current. A meter-mounted transfer switch shall be listed and be capable of transferring the load served. A meter-mounted transfer switch shall be marked on its exterior with both of the following:Meter-mounted transfer switchNot service equipmentControl power circuits for protective relays where installed as part of listed equipment, if overcurrent protection and disconnecting means are provided. [230.82](https://2023.antflix.net#230.82)

https://2023.antflix.net#230.82

Chapter 2 Wiring and Protection

230.85

For one- and two-family dwelling units, an emergency disconnecting means shall be installed. [230.85](https://2023.antflix.net#230.85)

https://2023.antflix.net#230.85

Chapter 2 Wiring and Protection

230.85(A)(1)

The disconnecting means shall be installed in a readily accessible outdoor location on or within sight of the dwelling unit. Exception: Where the requirements of 225.41 are met, this section shall not apply. [230.85(A)(1)](https://2023.antflix.net#230.85(A)(1))

https://2023.antflix.net#230.85(A)(1)

Chapter 2 Wiring and Protection

230.85(A)(2)

The disconnecting means shall have a short-circuit current rating equal to or greater than the available fault current. [230.85(A)(2)](https://2023.antflix.net#230.85(A)(2))

https://2023.antflix.net#230.85(A)(2)

Chapter 2 Wiring and Protection

230.85(A)(3)

If more than one disconnecting means is provided, they shall be grouped. [230.85(A)(3)](https://2023.antflix.net#230.85(A)(3))

https://2023.antflix.net#230.85(A)(3)

Chapter 2 Wiring and Protection

230.85(B)

Each disconnect shall be one of the following: Service disconnectA meter disconnect integral to the meter mounting equipment not marked as suitable only for use as service equipment installed in accordance with 230.82Other listed disconnect switch or circuit breaker that is marked suitable for use as service equipment, but not marked as suitable only for use as service equipment, installed on the supply side of each service disconnectInformational Note 1: Conductors between the emergency disconnect and the service disconnect in 230.85(2) and 230.85(3) are service conductors.Informational Note 2: Equipment marked "Suitable only for use as service equipment" includes the factory marking "Service Disconnect". [230.85(B)](https://2023.antflix.net#230.85(B))

https://2023.antflix.net#230.85(B)

Chapter 2 Wiring and Protection

230.85(C)

Where service equipment is replaced, all of the requirements of this section shall apply. Exception: Where only meter sockets, service entrance conductors, or related raceways and fittings are replaced, the requirements of this section shall not apply. [230.85(C)](https://2023.antflix.net#230.85(C))

https://2023.antflix.net#230.85(C)

Chapter 2 Wiring and Protection

230.85(D)

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. [230.85(D)](https://2023.antflix.net#230.85(D))

https://2023.antflix.net#230.85(D)

Chapter 2 Wiring and Protection

230.85(E)(1)

The disconnecting means shall marked as follows: Service disconnectEMERGENCY DISCONNECT, SERVICE DISCONNECTMeter disconnects installed in accordance with 230.82(3) and marked as follows:EMERGENCY DISCONNECT, METER DISCONNECT, NOT SERVICE EQUIPMENTOther listed disconnect switches or circuit breakers on the supply side of each service disconnect that are marked suitable for use as service equipment and marked as follows:EMERGENCY DISCONNECT, NOT SERVICE EQUIPMENT [230.85(E)(1)](https://2023.antflix.net#230.85(E)(1))

https://2023.antflix.net#230.85(E)(1)

Chapter 2 Wiring and Protection

230.85(E)(2)

Markings shall comply with 110.21 (B) and both 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 at least 13 mm (1/2 in.) high. [230.85(E)(2)](https://2023.antflix.net#230.85(E)(2))

https://2023.antflix.net#230.85(E)(2)

Chapter 2 Wiring and Protection

230.90

Each ungrounded service conductor shall have overload protection. [230.90](https://2023.antflix.net#230.90)

https://2023.antflix.net#230.90

Chapter 2 Wiring and Protection

230.90(A)

Such protection shall be provided by an overcurrent device in series with each ungrounded service conductor that has a rating or setting not higher than the ampacity of the conductor. A set of fuses shall be considered all the fuses required to protect all the ungrounded conductors of a circuit. Single-pole circuit breakers, grouped in accordance with 230.71(B), shall be considered as one protective device. Exception No. 1: For motor-starting currents, ratings that comply with 430.52, 430.62, and 430.63 shall be permitted. Exception No. 2: Fuses and circuit breakers with a rating or setting that complies with 240.4(B) or (C) and 240.6 shall be permitted. Exception No. 3: Two to six circuit breakers or sets of fuses shall be permitted as the overcurrent device to provide the overload protection. The sum of the ratings of the circuit breakers or fuses shall be permitted to exceed the ampacity of the service conductors, provided the calculated load does not exceed the ampacity of the service conductors. Exception No. 4: Overload protection for fire pump supply conductors shall comply with 695.4(B)(2)(a). Exception No. 5: Overload protection in accordance with the conductor ampacities of 310.12 shall be permitted for single-phase dwelling services. [230.90(A)](https://2023.antflix.net#230.90(A))

https://2023.antflix.net#230.90(A)

Chapter 2 Wiring and Protection

230.90(B)

No overcurrent device shall be inserted in a grounded service conductor except a circuit breaker that simultaneously opens all conductors of the circuit. [230.90(B)](https://2023.antflix.net#230.90(B))

https://2023.antflix.net#230.90(B)

Chapter 2 Wiring and Protection

230.91

The service overcurrent device shall be an integral part of the service disconnecting means or shall be located immediately adjacent thereto. Where fuses are used as the service overcurrent device, the disconnecting means shall be located ahead of the supply side of the fuses. [230.91](https://2023.antflix.net#230.91)

https://2023.antflix.net#230.91

Chapter 2 Wiring and Protection

230.92

Where the service overcurrent devices are locked or sealed or are not readily accessible to the occupant, branch-circuit or feeder overcurrent devices shall be installed on the load side, shall be mounted in a readily accessible location, and shall be of lower ampere rating than the service overcurrent device. [230.92](https://2023.antflix.net#230.92)

https://2023.antflix.net#230.92

Chapter 2 Wiring and Protection

230.93

Where necessary to prevent tampering, an automatic overcurrent device that protects service conductors supplying only a specific load, such as a water heater, shall be permitted to be locked or sealed where located so as to be accessible. [230.93](https://2023.antflix.net#230.93)

https://2023.antflix.net#230.93

Chapter 2 Wiring and Protection

230.94

The overcurrent device shall protect all circuits and devices. Exception No. 1: The service switch shall be permitted on the supply side. Exception No. 2: High-impedance shunt circuits, surge arresters, Type 1 surge-protective devices, surge-protective capacitors, and instrument transformers (current and voltage) shall be permitted to be connected and installed on the supply side of the service disconnecting means as permitted by 230.82. Exception No. 3: Circuits for load management devices shall be permitted to be connected on the supply side of the service overcurrent device where separately provided with overcurrent protection. Exception No. 4: Circuits used only for the operation of fire alarm, other protective signaling systems, or the supply to fire pump equipment shall be permitted to be connected on the supply side of the service overcurrent device where separately provided with overcurrent protection. Exception No. 5: Meters nominally rated not in excess of 600 volts shall be permitted, provided all metal housings and service enclosures are grounded. Exception No. 6: Where service equipment is power operable, the control circuit shall be permitted to be connected ahead of the service equipment if suitable overcurrent protection and disconnecting means are provided. [230.94](https://2023.antflix.net#230.94)

https://2023.antflix.net#230.94

Chapter 2 Wiring and Protection

230.95

Ground-fault protection of equipment shall be provided for solidly grounded wye electric services of more than 150 volts to ground but not exceeding 1000 volts phase-to-phase for each service disconnect rated 1000 amperes or more. The grounded conductor for the solidly grounded wye system shall be connected directly to ground through a grounding electrode system, as specified in 250.50, without inserting any resistor or impedance device. The rating of the service disconnect shall be considered to be the rating of the largest fuse that can be installed or the highest continuous current trip setting for which the actual overcurrent device installed in a circuit breaker is rated or can be adjusted. Exception: The ground-fault protection provisions of this section shall not apply to a service disconnect for a continuous industrial process where a nonorderly shutdown will introduce additional or increased hazards. [230.95](https://2023.antflix.net#230.95)

https://2023.antflix.net#230.95

Chapter 2 Wiring and Protection

230.95(A)

The ground-fault protection system shall operate to cause the service disconnect to open all ungrounded conductors of the faulted circuit. The maximum setting of the ground-fault protection shall be 1200 amperes, and the maximum time delay shall be one second for ground-fault currents equal to or greater than 3000 amperes. [230.95(A)](https://2023.antflix.net#230.95(A))

https://2023.antflix.net#230.95(A)

Chapter 2 Wiring and Protection

230.95(B)

If a switch and fuse combination is used, the fuses employed shall be capable of interrupting any current higher than the interrupting capacity of the switch during a time that the ground-fault protective system will not cause the switch to open. [230.95(B)](https://2023.antflix.net#230.95(B))

https://2023.antflix.net#230.95(B)

Chapter 2 Wiring and Protection

230.95(C)

The ground-fault protection system shall be performance tested when first installed on site. This testing shall be conducted by a qualified person(s) using a test process of primary current injection, in accordance with instructions that shall be provided with the equipment. A written record of this testing shall be made and shall be available to the authority having jurisdiction. Informational Note No. 1: Ground-fault protection that functions to open the service disconnect affords no protection from faults on the line side of the protective element. It serves only to limit damage to conductors and equipment on the load side in the event of an arcing ground fault on the load side of the protective element. Informational Note No. 2: This added protective equipment at the service equipment could make it necessary to review the overall wiring system for proper selective overcurrent protection coordination. Additional installations of ground-fault protective equipment might be needed on feeders and branch circuits where maximum continuity of electric service is necessary. Informational Note No. 3: Where ground-fault protection is provided for the service disconnect and interconnection is made with another supply system by a transfer device, means or devices could be needed to ensure proper ground-fault sensing by the ground-fault protection equipment. Informational Note No. 4: See 517.17(A) for information on where an additional step of ground-fault protection is required for hospitals and other buildings with critical areas or life support equipment. [230.95(C)](https://2023.antflix.net#230.95(C))

https://2023.antflix.net#230.95(C)

Chapter 2 Wiring and Protection

235.1

This article provides the general requirements for branch circuits, feeders, and services over 1000 volts ac or 1500 volts dc, nominal. Informational Note: See ANSI/IEEE C2-2017, National Electrical Safety Code, for additional information on wiring over 1000 volts, nominal. [235.1](https://2023.antflix.net#235.1)

https://2023.antflix.net#235.1

Chapter 2 Wiring and Protection

235.3

Table 235.3 lists references for specific equipment and applications not located in Chapters 5, 6, and 7 that amend or supplement the requirements of this article. Table 235.3 References for Specific Equipment and Applications Not Located in Chapters 5, 6, and 7 Equipment Article Section Air-conditioning and refrigerating equipment 440.6, 440.31, and 440.32 Busways 368.17 Central heating equipment other than fixed electric space-heating equipment 422.12 Fixed electric heating equipment for pipelines and vessels 427.4 Fixed electric space-heating equipment 424.4 Fixed outdoor electrical deicing and snow-melting equipment 426.4 Infrared lamp industrial heating equipment 422.48 and 424.3 Motors, motor circuits, and controllers 430 [235.3](https://2023.antflix.net#235.3)

https://2023.antflix.net#235.3

Chapter 2 Wiring and Protection

235.5(A)

The grounded conductor of a branch circuit shall be identified in accordance with 200.6. [235.5(A)](https://2023.antflix.net#235.5(A))

https://2023.antflix.net#235.5(A)

Chapter 2 Wiring and Protection

235.5(B)

The equipment grounding conductor shall be identified in accordance with 250.119. [235.5(B)](https://2023.antflix.net#235.5(B))

https://2023.antflix.net#235.5(B)

Chapter 2 Wiring and Protection

235.5(C)

Ungrounded conductors shall be identified in accordance with 235.5(C)(1) or (C)(2), as applicable. [235.5(C)](https://2023.antflix.net#235.5(C))

https://2023.antflix.net#235.5(C)

Chapter 2 Wiring and Protection

235.5(C)(1)

Where the premises wiring system has branch circuits supplied from more than one nominal voltage system, each ungrounded conductor of a branch circuit shall be identified by phase or line and by nominal system voltage at all termination, connection, and splice points in accordance with 235.5(C)(1)(a) and (C)(1)(b). Different systems within the same premises that have the same nominal voltage shall be permitted to use the same identification. Means of Identification. The means of identification shall be permitted to be by separate color coding, marking tape, tagging, or other approved means.Posting of Identification Means. The method used for conductors originating within each branch-circuit panelboard or similar branch-circuit distribution equipment shall be documented in a manner that is readily available or shall be permanently posted at each branch-circuit panelboard or similar branch-circuit distribution equipment. The label shall be of sufficient durability to withstand the environment involved and shall not be handwritten.Exception: In existing installations where a voltage system(s) already exists and a different voltage system is being added, it shall be permissible to mark only the new system voltage. Existing unidentified systems shall not be required to be identified at each termination, connection, and splice point in accordance with 235.5(C)(1)(a) and (C)(1)(b). Labeling shall be required at each voltage system distribution equipment to identify that only one voltage system has been marked for a new system(s). The new system label(s) shall include the words "other unidentified systems exist on the premises." [235.5(C)(1)](https://2023.antflix.net#235.5(C)(1))

https://2023.antflix.net#235.5(C)(1)

Chapter 2 Wiring and Protection

235.5(C)(2)

Where a branch circuit is supplied from a dc system operating at more than 1500 volts, each ungrounded conductor of 4 AWG or larger shall be identified by polarity at all termination, connection, and splice points by marking tape, tagging, or other approved means and each ungrounded conductor of 6 AWG or smaller shall be identified by polarity at all termination, connection, and splice points in compliance with 235.5(C)(2)(a) and (C)(2)(b). The identification methods used for conductors originating within each branch-circuit panelboard or similar branch-circuit distribution equipment shall be documented in a manner that is readily available or be permanently posted at each branch-circuit panelboard or similar branch-circuit distribution equipment. Positive Polarity, Sizes 6 AWG or Smaller. Where the positive polarity of a dc system does not serve as the connection point for the grounded conductor, each positive ungrounded conductor shall be identified by one of the following means:A continuous red outer finishA continuous red stripe durably marked along the conductor's entire length on insulation of a color other than green, white, gray, or blackImprinted plus signs (+) or the word POSITIVE or POS durably marked on insulation of a color other than green, white, gray, or black and repeated at intervals not exceeding 610 mm (24 in.) in accordance with 310.8(B)An approved permanent marking means such as sleeving or shrink-tubing that is suitable for the conductor size, at all termination, connection, and splice points, with imprinted plus signs (+) or the word POSITIVE or POS durably marked on insulation of a color other than green, white, gray, or blackNegative Polarity, Sizes 6 AWG or Smaller. Where the negative polarity of a dc system does not serve as the connection point for the grounded conductor, each negative ungrounded conductor shall be identified by one of the following means:A continuous black outer finishA continuous black stripe durably marked along the conductor's entire length on insulation of a color other than green, white, gray, or redImprinted minus signs (—) or the word NEGATIVE or NEG durably marked on insulation of a color other than green, white, gray, or red and repeated at intervals not exceeding 610 mm (24 in.) in accordance with 310.8(B)An approved permanent marking means such as sleeving or shrink-tubing that is suitable for the conductor size, at all termination, connection, and splice points, with imprinted minus signs (—) or the word NEGATIVE or NEG durably marked on insulation of a color other than green, white, gray, or red [235.5(C)(2)](https://2023.antflix.net#235.5(C)(2))

https://2023.antflix.net#235.5(C)(2)

Chapter 2 Wiring and Protection

235.6

Circuits exceeding 1000 volts ac or 1500 volts dc, nominal, between conductors shall be permitted to supply utilization equipment in installations where conditions of maintenance and supervision ensure that only qualified persons service the installation. [235.6](https://2023.antflix.net#235.6)

https://2023.antflix.net#235.6

Chapter 2 Wiring and Protection

235.9

Branch circuits shall not be derived from autotransformers unless the circuit supplied has a grounded conductor that is electrically connected to a grounded conductor of the system supplying the autotransformer. [235.9](https://2023.antflix.net#235.9)

https://2023.antflix.net#235.9

Chapter 2 Wiring and Protection

235.10

Two-wire dc circuits and ac circuits of two or more ungrounded conductors shall be permitted to be tapped from the ungrounded conductors of circuits that have a grounded neutral conductor. Switching devices in each tapped circuit shall have a pole in each ungrounded conductor. All poles of multipole switching devices shall manually switch together where such switching devices also serve as a disconnecting means as required by the following sections: 410.93 for double-pole switched lampholders410.104(B) for electric-discharge lamp auxiliary equipment switching devices422.31(B) for an appliance424.20 for a fixed electric space-heating unit426.51 for electric deicing and snow-melting equipment430.85 for a motor controller430.103 for a motor [235.10](https://2023.antflix.net#235.10)

https://2023.antflix.net#235.10

Chapter 2 Wiring and Protection

235.11

The minimum number of branch circuits shall be determined from the total calculated load and the size or rating of the circuits used. In all installations, the number of circuits shall be sufficient to supply the load served. [235.11](https://2023.antflix.net#235.11)

https://2023.antflix.net#235.11

Chapter 2 Wiring and Protection

235.18

Branch circuits recognized by this article shall be rated in accordance with the maximum permitted ampere rating or setting of the overcurrent device. Where conductors of higher ampacity are used for any reason, the ampere rating or setting of the specified overcurrent device shall determine the circuit rating. [235.18](https://2023.antflix.net#235.18)

https://2023.antflix.net#235.18

Chapter 2 Wiring and Protection

235.19

The ampacity of conductors shall be in accordance with 310.14 and 315.60, as applicable. Branch-circuit conductors shall be sized in accordance with 235.19(A) or (B). [235.19](https://2023.antflix.net#235.19)

https://2023.antflix.net#235.19

Chapter 2 Wiring and Protection

235.19(A)

The ampacity of branch-circuit conductors shall not be less than 125 percent of the designed potential load of utilization equipment that will be operated simultaneously. [235.19(A)](https://2023.antflix.net#235.19(A))

https://2023.antflix.net#235.19(A)

Chapter 2 Wiring and Protection

235.19(B)

For supervised installations, branch-circuit conductor sizing shall be permitted to be determined by qualified persons under engineering supervision. Supervised installations are defined as those portions of a facility where both of the following conditions are met: Conditions of design and installation are provided under engineering supervision.Qualified persons with documented training and experience in over 1000-volt ac or 1500-volt dc systems provide maintenance, monitoring, and servicing of the system. [235.19(B)](https://2023.antflix.net#235.19(B))

https://2023.antflix.net#235.19(B)

Chapter 2 Wiring and Protection

235.20

Branch-circuit conductors and equipment shall be protected by overcurrent protective devices that have a rating or setting that complies with 235.20(A) through (C). [235.20](https://2023.antflix.net#235.20)

https://2023.antflix.net#235.20

Chapter 2 Wiring and Protection

235.20(A)

Where a branch circuit supplies continuous loads or any combination of continuous and noncontinuous loads, the rating of the overcurrent device shall not be less than the noncontinuous load plus 125 percent of the continuous load. Exception: Where the assembly, including the overcurrent devices protecting the branch circuit(s), is listed for operation at 100 percent of its rating, the ampere rating of the overcurrent device shall be permitted to be not less than the sum of the continuous load plus the noncontinuous load. [235.20(A)](https://2023.antflix.net#235.20(A))

https://2023.antflix.net#235.20(A)

Chapter 2 Wiring and Protection

235.20(B)

Conductors shall be protected in accordance with the ampacities specified in 310.14 or 315.60, as applicable. [235.20(B)](https://2023.antflix.net#235.20(B))

https://2023.antflix.net#235.20(B)

Chapter 2 Wiring and Protection

235.20(C)

The rating or setting of the overcurrent protective device shall not exceed that specified in the applicable articles referenced in Table 240.3 for equipment. [235.20(C)](https://2023.antflix.net#235.20(C))

https://2023.antflix.net#235.20(C)

Chapter 2 Wiring and Protection

235.22

An individual branch circuit shall be permitted to supply any load for which it is rated, but in no case shall the load exceed the branch-circuit ampere rating. [235.22](https://2023.antflix.net#235.22)

https://2023.antflix.net#235.22

Chapter 2 Wiring and Protection

235.23

A branch circuit supplying two or more outlets or receptacles shall supply only the loads specified according to its size in accordance with 210.23(A) through (E) and as summarized in 210.24, and in no case shall the load exceed the branch-circuit ampere rating. [235.23](https://2023.antflix.net#235.23)

https://2023.antflix.net#235.23

Chapter 2 Wiring and Protection

235.23(A)

A 15- or 20-ampere branch circuit shall be permitted to supply lighting outlets, lighting units, or other utilization equipment, or any combination of them, and shall comply with 235.23(A)(1) and (A)(2). [235.23(A)](https://2023.antflix.net#235.23(A))

https://2023.antflix.net#235.23(A)

Chapter 2 Wiring and Protection

235.23(A)(1)

The rating of any one cord-and-plug-connected utilization equipment not fastened in place shall not exceed 80 percent of the branch-circuit ampere rating. [235.23(A)(1)](https://2023.antflix.net#235.23(A)(1))

https://2023.antflix.net#235.23(A)(1)

Chapter 2 Wiring and Protection

235.23(A)(2)

The total rating of utilization equipment fastened in place, other than luminaires, shall not exceed 50 percent of the branch-circuit ampere rating where lighting units, cord-and-plug-connected utilization equipment not fastened in place, or both, are also supplied. [235.23(A)(2)](https://2023.antflix.net#235.23(A)(2))

https://2023.antflix.net#235.23(A)(2)

Chapter 2 Wiring and Protection

235.23(B)

A 30-ampere branch circuit shall be permitted to supply fixed lighting units with heavy-duty lampholders in other than a dwelling unit(s) or utilization equipment in any occupancy. The rating of any one cord-and-plug-connected utilization equipment shall not exceed 80 percent of the branch-circuit ampere rating. [235.23(B)](https://2023.antflix.net#235.23(B))

https://2023.antflix.net#235.23(B)

Chapter 2 Wiring and Protection

235.23(C)

A 40- or 50-ampere branch circuit shall be permitted to supply cooking appliances that are fastened in place in any occupancy. In other than dwelling units, such circuits shall be permitted to supply fixed lighting units with heavy-duty lampholders, infrared heating units, or other utilization equipment. [235.23(C)](https://2023.antflix.net#235.23(C))

https://2023.antflix.net#235.23(C)

Chapter 2 Wiring and Protection

235.23(D)

Branch circuits larger than 50 amperes shall supply only nonlighting outlet loads. [235.23(D)](https://2023.antflix.net#235.23(D))

https://2023.antflix.net#235.23(D)

Chapter 2 Wiring and Protection

235.63

A 125-volt, single-phase, 15- or 20-ampere-rated receptacle outlet shall be installed at an accessible location within 7.5 m (25 ft) of the equipment as specified in 210.63(A) and (B). Informational Note: See 210.8(E) for requirements on GFCI protection. [235.63](https://2023.antflix.net#235.63)

https://2023.antflix.net#235.63

Chapter 2 Wiring and Protection

235.63(A)

The required receptacle outlet shall be located on the same level as the heating, air-conditioning, and refrigeration equipment. The receptacle outlet shall not be connected to the load side of the equipment's branch-circuit disconnecting means. Exception: A receptacle outlet shall not be required at one- and two-family dwellings for the service of evaporative coolers. [235.63(A)](https://2023.antflix.net#235.63(A))

https://2023.antflix.net#235.63(A)

Chapter 2 Wiring and Protection

235.63(B)

In other than one- and two-family dwellings, a receptacle outlet shall be located as specified in 210.63(B)(1) and (B)(2). [235.63(B)](https://2023.antflix.net#235.63(B))

https://2023.antflix.net#235.63(B)

Chapter 2 Wiring and Protection

235.63(B)(1)

The required receptacle outlet shall be located within the same room or area as the service equipment. [235.63(B)(1)](https://2023.antflix.net#235.63(B)(1))

https://2023.antflix.net#235.63(B)(1)

Chapter 2 Wiring and Protection

235.63(B)(2)

Where equipment, other than service equipment, requires dedicated equipment space as specified in 110.26(E), the required receptacle outlet shall be located within the same room or area as the electrical equipment and shall not be connected to the load side of the equipment's disconnecting means. [235.63(B)(2)](https://2023.antflix.net#235.63(B)(2))

https://2023.antflix.net#235.63(B)(2)

Chapter 2 Wiring and Protection

235.201

Part III covers the installation requirements, overcurrent protection requirements, minimum size, and ampacity of conductors for feeders over 1000 volts ac or 1500 volts dc, nominal. [235.201](https://2023.antflix.net#235.201)

https://2023.antflix.net#235.201

Chapter 2 Wiring and Protection

235.202

The ampacity of conductors shall be in accordance with 310.14 and 315.60 as applicable. Where installed, the size of the feeder-circuit grounded conductor shall not be smaller than that required by 250.122, except that 250.122(F) shall not apply where grounded conductors are run in parallel. Feeder conductors over 1000 volts shall be sized in accordance with 235.202(A), (B), or (C). [235.202](https://2023.antflix.net#235.202)

https://2023.antflix.net#235.202

Chapter 2 Wiring and Protection

235.202(A)

The ampacity of feeder conductors shall not be less than the sum of the nameplate ratings of the transformers supplied when only transformers are supplied. [235.202(A)](https://2023.antflix.net#235.202(A))

https://2023.antflix.net#235.202(A)

Chapter 2 Wiring and Protection

235.202(B)

The ampacity of feeders supplying a combination of transformers and utilization equipment shall not be less than the sum of the nameplate ratings of the transformers and 125 percent of the designed potential load of the utilization equipment that will be operated simultaneously. [235.202(B)](https://2023.antflix.net#235.202(B))

https://2023.antflix.net#235.202(B)

Chapter 2 Wiring and Protection

235.202(C)

For supervised installations, feeder conductor sizing shall be permitted to be determined by qualified persons under engineering supervision in accordance with 310.14(B) or 315.60(B). Supervised installations are defined as those portions of a facility where all of the following conditions are met: Conditions of design and installation are provided under engineering supervision.Qualified persons with documented training and experience in over 1000-volt systems provide maintenance, monitoring, and servicing of the system. [235.202(C)](https://2023.antflix.net#235.202(C))

https://2023.antflix.net#235.202(C)

Chapter 2 Wiring and Protection

235.203

Feeders shall be protected against overcurrent. [235.203](https://2023.antflix.net#235.203)

https://2023.antflix.net#235.203

Chapter 2 Wiring and Protection

235.205

If required by the authority having jurisdiction, a diagram showing feeder details shall be provided prior to the installation of the feeders. Such a diagram shall show the area in square feet of the building or other structure supplied by each feeder, the total calculated load before applying demand factors, the demand factors used, the calculated load after applying demand factors, and the size and type of conductors to be used. [235.205](https://2023.antflix.net#235.205)

https://2023.antflix.net#235.205

Chapter 2 Wiring and Protection

235.206

Where a feeder supplies branch circuits in which equipment grounding conductors are required, the feeder shall include or provide an equipment grounding conductor, to which the equipment grounding conductors of the branch circuits shall be connected. Where the feeder supplies a separate building or structure, the requirements of 250.32 shall apply. [235.206](https://2023.antflix.net#235.206)

https://2023.antflix.net#235.206

Chapter 2 Wiring and Protection

235.212(A)

The grounded conductor of a feeder, if insulated, shall be identified in accordance with 200.6. [235.212(A)](https://2023.antflix.net#235.212(A))

https://2023.antflix.net#235.212(A)

Chapter 2 Wiring and Protection

235.212(B)

The equipment grounding conductor shall be identified in accordance with 250.119. [235.212(B)](https://2023.antflix.net#235.212(B))

https://2023.antflix.net#235.212(B)

Chapter 2 Wiring and Protection

235.212(C)

Ungrounded conductors shall be identified in accordance with 235.212(C)(1) or (C)(2), as applicable. [235.212(C)](https://2023.antflix.net#235.212(C))

https://2023.antflix.net#235.212(C)

Chapter 2 Wiring and Protection

235.212(C)(1)

Where the premises wiring system has feeders supplied from more than one nominal voltage system, each ungrounded conductor of a feeder shall be identified by phase or line and system at all termination, connection, and splice points in compliance with 235.212(C)(1)(a) and (C)(1)(b). Means of Identification. The means of identification shall be permitted to be by separate color coding, marking tape, tagging, or other approved means.Posting of Identification Means. The method utilized for conductors originating within each feeder panelboard or similar feeder distribution equipment shall be documented in a manner that is readily available or shall be permanently posted at each feeder panelboard or similar feeder distribution equipment. [235.212(C)(1)](https://2023.antflix.net#235.212(C)(1))

https://2023.antflix.net#235.212(C)(1)

Chapter 2 Wiring and Protection

235.212(C)(2)

Where a feeder is supplied from a dc system operating at more than 1500 volts, each ungrounded conductor of 4 AWG or larger shall be identified by polarity at all termination, connection, and splice points by marking tape, tagging, or other approved means; each ungrounded conductor of 6 AWG or smaller shall be identified by polarity at all termination, connection, and splice points in compliance with 235.212(C)(2)(a) and (C)(2)(b). The identification methods utilized for conductors originating within each feeder panelboard or similar feeder distribution equipment shall be documented in a manner that is readily available or shall be permanently posted at each feeder panelboard or similar feeder distribution equipment. Positive Polarity, Sizes 6 AWG or Smaller. Where the positive polarity of a dc system does not serve as the connection for the grounded conductor, each positive ungrounded conductor shall be identified by one of the following means:A continuous red outer finishA continuous red stripe durably marked along the conductor's entire length on insulation of a color other than green, white, gray, or blackImprinted plus signs (+) or the word POSITIVE or POS durably marked on insulation of a color other than green, white, gray, or black, and repeated at intervals not exceeding 610 mm (24 in.) in accordance with 310.8(B)An approved permanent marking means such as sleeving or shrink-tubing that is suitable for the conductor size, at all termination, connection, and splice points, with imprinted plus signs (+) or the word POSITIVE or POS durably marked on insulation of a color other than green, white, gray, or blackNegative Polarity, Sizes 6 AWG or Smaller. Where the negative polarity of a dc system does not serve as the connection for the grounded conductor, each negative ungrounded conductor shall be identified by one of the following means:A continuous black outer finishA continuous black stripe durably marked along the conductor's entire length on insulation of a color other than green, white, gray, or redImprinted minus signs (—) or the word NEGATIVE or NEG durably marked on insulation of a color other than green, white, gray, or red, and repeated at intervals not exceeding 610 mm (24 in.) in accordance with 310.8(B)An approved permanent marking means such as sleeving or shrink-tubing that is suitable for the conductor size, at all termination, connection, and splice points, with imprinted minus signs (—) or the word NEGATIVE or NEG durably marked on insulation of a color other than green, white, gray, or red [235.212(C)(2)](https://2023.antflix.net#235.212(C)(2))

https://2023.antflix.net#235.212(C)(2)

Chapter 2 Wiring and Protection

235.301

Part IV covers requirements for outside branch circuits and feeders over 1000 volts ac or 1500 volts dc, nominal, that are run on or between buildings, structures, or poles on the premises; and electrical equipment and wiring for the supply of utilization equipment that is located on or attached to the outside of buildings, structures, or poles. Outside branch circuits and feeders over 1000 volts ac or 1500 volts dc, nominal, shall comply with the applicable requirements in Parts I and II of Article 225 and with Part IV of this article, which supplements or modifies those requirements. [235.301](https://2023.antflix.net#235.301)

https://2023.antflix.net#235.301

Chapter 2 Wiring and Protection

235.306

For overhead spans, open individual conductors shall not be smaller than 6 AWG copper or 4 AWG aluminum where open individual conductors and 8 AWG copper or 6 AWG aluminum where in cable. [235.306](https://2023.antflix.net#235.306)

https://2023.antflix.net#235.306

Chapter 2 Wiring and Protection

235.310

The installation of outside wiring on surfaces of buildings (or other structures) shall be installed as provided in 305.3. [235.310](https://2023.antflix.net#235.310)

https://2023.antflix.net#235.310

Chapter 2 Wiring and Protection

235.314

Conductors shall comply with the spacings provided in 110.36 and 495.24. [235.314](https://2023.antflix.net#235.314)

https://2023.antflix.net#235.314

Chapter 2 Wiring and Protection

235.339

The feeder or branch-circuit disconnecting means shall have a rating of not less than the calculated load to be supplied, determined in accordance with Parts I and II of Article 220 for branch circuits, Part III or IV of Article 220 for feeders, or Part V of Article 220 for farm loads. [235.339](https://2023.antflix.net#235.339)

https://2023.antflix.net#235.339

Chapter 2 Wiring and Protection

235.350

The sizing of conductors over 1000 volts shall be in accordance with 235.19(A) for branch circuits and 235.19(B) for feeders. [235.350](https://2023.antflix.net#235.350)

https://2023.antflix.net#235.350

Chapter 2 Wiring and Protection

235.351

Where oil switches or air, oil, vacuum, or sulfur hexafluoride circuit breakers constitute a building disconnecting means, an isolating switch with visible break contacts and meeting the requirements of 235.404(B), (C), and (D) shall be installed on the supply side of the disconnecting means and all associated equipment. Exception: The isolating switch shall not be required where the disconnecting means is mounted on removable truck panels or switchgear units that cannot be opened unless the circuit is disconnected and that, when removed from the normal operating position, automatically disconnect the circuit breaker or switch from all energized parts. [235.351](https://2023.antflix.net#235.351)

https://2023.antflix.net#235.351

Chapter 2 Wiring and Protection

235.352(A)

A building or structure disconnecting means shall be located in accordance with 225.31 (B), or, if not readily accessible, it shall be operable by mechanical linkage from a readily accessible point. For multibuilding industrial installations under single management, it shall be permitted to be electrically operated by a readily accessible, remote-control device in a separate building or structure. [235.352(A)](https://2023.antflix.net#235.352(A))

https://2023.antflix.net#235.352(A)

Chapter 2 Wiring and Protection

235.352(B)

Each building or structure disconnect shall simultaneously disconnect all ungrounded supply conductors it controls and shall have a fault-closing rating not less than the available fault current at its supply terminals. Exception: Where the individual disconnecting means consists of fused cutouts, the simultaneous disconnection of all ungrounded supply conductors shall not be required if there is a means to disconnect the load before opening the cutouts. A permanent legible sign shall be installed adjacent to the fused cutouts and shall read DISCONNECT LOAD BEFORE OPENING CUTOUTS. Where fused switches or separately mounted fuses are installed, the fuse characteristics shall be permitted to contribute to the fault-closing rating of the disconnecting means. [235.352(B)](https://2023.antflix.net#235.352(B))

https://2023.antflix.net#235.352(B)

Chapter 2 Wiring and Protection

235.352(C)

Disconnecting means shall be lockable open in accordance with 110.25. Exception: Where an individual disconnecting means consists of fused cutouts, a suitable enclosure capable of being locked and sized to contain all cutout fuse holders shall be installed at a convenient location to the fused cutouts. [235.352(C)](https://2023.antflix.net#235.352(C))

https://2023.antflix.net#235.352(C)

Chapter 2 Wiring and Protection

235.352(D)

Disconnecting means shall clearly indicate whether they are in the open "off" or closed "on" position. [235.352(D)](https://2023.antflix.net#235.352(D))

https://2023.antflix.net#235.352(D)

Chapter 2 Wiring and Protection

235.352(E)

Where disconnecting means handles are operated vertically, the "up" position of the handle shall be the "on" position. Exception: A switching device having more than one "on" position, such as a double throw switch, shall not be required to comply with this requirement. [235.352(E)](https://2023.antflix.net#235.352(E))

https://2023.antflix.net#235.352(E)

Chapter 2 Wiring and Protection

235.352(F)

Where a building or structure has any combination of feeders, branch circuits, or services passing through or supplying it, a permanent plaque or directory shall be installed at each feeder and branch-circuit disconnect location that denotes all other services, feeders, or branch circuits supplying that building or structure or passing through that building or structure and the area served by each. [235.352(F)](https://2023.antflix.net#235.352(F))

https://2023.antflix.net#235.352(F)

Chapter 2 Wiring and Protection

235.356(A)

The complete electrical system design, including settings for protective, switching, and control circuits, shall be prepared in advance and made available on request to the authority having jurisdiction and shall be performance tested when first installed on-site. Each protective, switching, and control circuit shall be adjusted in accordance with the system design and tested by actual operation using current injection or equivalent methods as necessary to ensure that each and every such circuit operates correctly to the satisfaction of the authority having jurisdiction. [235.356(A)](https://2023.antflix.net#235.356(A))

https://2023.antflix.net#235.356(A)

Chapter 2 Wiring and Protection

235.356(A)(1)

All instrument transformers shall be tested to verify correct polarity and burden. [235.356(A)(1)](https://2023.antflix.net#235.356(A)(1))

https://2023.antflix.net#235.356(A)(1)

Chapter 2 Wiring and Protection

235.356(A)(2)

Each protective relay shall be demonstrated to operate by injecting current or voltage, or both, at the associated instrument transformer output terminal and observing that the associated switching and signaling functions occur correctly and in proper time and sequence to accomplish the protective function intended. [235.356(A)(2)](https://2023.antflix.net#235.356(A)(2))

https://2023.antflix.net#235.356(A)(2)

Chapter 2 Wiring and Protection

235.356(A)(3)

Each switching circuit shall be observed to operate the associated equipment being switched. [235.356(A)(3)](https://2023.antflix.net#235.356(A)(3))

https://2023.antflix.net#235.356(A)(3)

Chapter 2 Wiring and Protection

235.356(A)(4)

Each control or signal circuit shall be observed to perform its proper control function or produce a correct signal output. [235.356(A)(4)](https://2023.antflix.net#235.356(A)(4))

https://2023.antflix.net#235.356(A)(4)

Chapter 2 Wiring and Protection

235.356(A)(5)

All metering circuits shall be verified to operate correctly from voltage and current sources in a similar manner to protective relay circuits. [235.356(A)(5)](https://2023.antflix.net#235.356(A)(5))

https://2023.antflix.net#235.356(A)(5)

Chapter 2 Wiring and Protection

235.356(A)(6)

Complete acceptance tests shall be performed, after the substation installation is completed, on all assemblies, equipment, conductors, and control and protective systems, as applicable, to verify the integrity of all the systems. [235.356(A)(6)](https://2023.antflix.net#235.356(A)(6))

https://2023.antflix.net#235.356(A)(6)