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// CODE SNIPPET

Section E3603 Service, Feeder and Grounding Electrode Conductor Sizing

2014 FBC - Residential, 5th edition > 36 Services > E3603 Service, Feeder and Grounding Electrode Conductor Sizing
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E3603.1 Grounded and Ungrounded Service Conductor Size

Conductors used as ungrounded service entrance conductors, service lateral conductors, and feeder conductors that serve as the main power feeder to a dwelling unit shall be those listed in Table E3603.1. The main power feeder shall be the feeder(s) between the main disconnect and the panelboard that supplies, either by branch circuits or by feeders, or both, all loads that are part of or are associated with the dwelling unit. The feeder conductors to a dwelling unit shall not be required to have an allowable ampacity greater than that of the service-entrance conductors that supply them. Ungrounded service conductors shall have a minimum size in accordance with Table E3603.1. The grounded conductor ampacity shall be not less than the maximum unbalance of the load and its size shall be not smaller than the required minimum grounding electrode conductor size specified in Table E3603.1.

TABLE E3603.1
SERVICE CONDUCTOR AND GROUNDING ELECTRODE CONDUCTOR SIZING

For SI: 1 inch = 25.4 mm.
  1. Where protected by a ferrous metal raceway, grounding electrode conductors shall be electrically bonded to the ferrous metal raceway at both ends.
  2. An 8 AWG grounding electrode conductor shall be protected with rigid metal conduit, intermediate metal conduit, rigid polyvinyl chloride (Type PVC) nonmetallic conduit, rigid thermosetting resin (Type RTRC) nonmetallic conduit, electrical metallic tubing or cable armor.
  3. Where not protected, 6 AWG grounding electrode conductor shall closely follow a structural surface for physical protection. The supports shall be spaced not more than 24 inches on center and shall be within 12 inches of any enclosure or termination.
  4. Where the sole grounding electrode system is a ground rod or pipe as covered in Section E3608.2, the grounding electrode conductor shall not be required to be larger than 6 AWG copper or 4 AWG aluminum. Where the sole grounding electrode system is the footing steel as covered in Section E3608.1.2, the grounding electrode conductor shall not be required to be larger than 4 AWG copper conductor.

E3603.2 Ungrounded Service Conductors for Accessory Buildings and Structures

Ungrounded conductors for other than dwelling units shall have an ampacity of not less than 60 amperes and shall be sized as required for feeders in Chapter 37.

Exceptions:
  1. For limited loads of a single branch circuit, the service conductors shall have an ampacity of not less than 15 amperes.
  2. For loads consisting of not more than two two-wire branch circuits, the service conductors shall have an ampacity of not less than 30 amperes.

E3603.3 Overload Protection

Each ungrounded service conductor shall have overload protection.

E3603.3.1 Ungrounded Conductor

Overload protection shall be provided by an overcurrent device installed in series with each ungrounded service conductor. The overcurrent device shall have a rating or setting not higher than the allowable service or feeder rating specified in Table E3603.1. A set of fuses shall be considered all the fuses required to protect all of the ungrounded conductors of a circuit. Single pole circuit breakers, grouped in accordance with Section E3601.7, shall be considered as one protective device.

Exception: 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 that the calculated load does not exceed the ampacity of the service conductors.

E3603.3.2 Not in Grounded Conductor

Overcurrent devices shall not be connected in series with a grounded service conductor except where a circuit breaker is used that simultaneously opens all conductors of the circuit.

E3603.3.3 Location

The service overcurrent device shall be an integral part of the service disconnecting means or shall be located immediately adjacent thereto.

E3603.4 Grounding Electrode Conductor Size

The grounding electrode conductors shall be sized based on the size of the service entrance conductors as required in Table E3603.1.

E3603.5 Temperature Limitations

Except where the equipment is marked otherwise, conductor ampacities used in determining equipment termination provisions shall be based on Table E3603.1.

Related Code Sections


Section E3603 Services, Service, Feeder and Grounding Electrode Conductor Sizing
TABLE E3603.1 SERVICE CONDUCTOR AND GROUNDING ELECTRODE CONDUCTOR SIZING For SI: 1 inch = 25.4 mm. Where protected by a ferrous metal raceway ...
2014 FBC - Residential, 5th edition > 36 Services > E3603 Service, Feeder and Grounding Electrode Conductor Sizing
Section E3603 Services, Service, Feeder and Grounding Electrode Conductor Sizing
electrode conductors shall be sized based on the size of the service entrance conductors as required in Table E3603.4. (250.66) TABLE E3603.4 GROUNDING ...
2017 FBC - Residential, 6th edition > 36 Services > E3603 Service, Feeder and Grounding Electrode Conductor Sizing
E3603.3 Services, Overload Protection
shall not be connected in series with a grounded service conductor except where a circuit breaker is used that simultaneously opens all conductors ...
2017 FBC - Residential, 6th edition > 36 Services > E3603 Service, Feeder and Grounding Electrode Conductor Sizing > E3603.3 Overload Protection
E3603.2 Services, Ungrounded Service Conductors for Accessory Buildings and Structures
Ungrounded conductors for other than dwelling units shall have an ampacity of not less than 60 amperes and shall be sized as required for feeders ...
2014 FBC - Residential, 5th edition > 36 Services > E3603 Service, Feeder and Grounding Electrode Conductor Sizing > E3603.2 Ungrounded Service Conductors for Accessory Buildings and Structures
E3603.2 Services, Ungrounded Service Conductors for Accessory Buildings and Structures
Ungrounded conductors for other than dwelling units shall have an ampacity of not less than 60 amperes and shall be sized as required for feeders ...
2017 FBC - Residential, 6th edition > 36 Services > E3603 Service, Feeder and Grounding Electrode Conductor Sizing > E3603.2 Ungrounded Service Conductors for Accessory Buildings and Structures
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