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  • NEW YORK
    • [ 2007 Residential Code of New York State ]

      E3503.1 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 E3503.1. The main power feeder shall be the feeder(s) between the main disconnect and the lighting and appliance branch-circuit panelboard(s). Ungrounded service conductors shall have a minimum size in accordance with Table E3503.1. The grounded conductor ampacity shall be not less than the maximum unbalance of the load and its size shall not be smaller than the required minimum grounding electrode conductor size specified in Table E3503.1.

      TABLE E3503.1 SERVICE CONDUCTOR AND GROUNDING ELECTRODE CONDUCTOR SIZING

      CONDUCTOR TYPES AND SIZES—THHW, THW, THWN, USE, XHHW
      (Parallel sets of 1/0 and larger conductors are
      permitted in either a single raceway or in separate raceways)
      		ALLOWABLE
      AMPACITY
      		MINIMUM GROUNDING
      ELECTRODE CONDUCTOR SIZEa
      Copper
      (AWG)
      		 Aluminum and copper-clad aluminum
      (AWG)
      		 Maximum load
      (amps)
      		 Copper
      (AWG)
      		 Aluminum
      (AWG)
      4
      		 2
      		 100
      		 8b
      		6c
      3
      		 1
      		 110
      		 8b
      		6c
      2
      		 1/0
      		 125
      		 8b
      		6c
      1
      		 2/0
      		 150
      		 6c
      		4
      1/0
      		 3/0
      		 175
      		 6c
      		4
      2/0
      		 4/0 or
      two sets of 1/0
      		 200
      		 4d
      		2d
      3/0
      		 250 kcmil or
      two sets of 2/0
      		 225
      		 4d
      		2d
      4/0 or
      two sets of 1/0
      		 300 kcmil or
      two sets of 3/0
      		 250
      		 2d
      		1/0d
      250 kcmil
      or two sets of 2/0
      		 350 kcmil or
      two sets of 4/0
      		 300
      		 2d
      		1/0d
      350 kcmil
      or two sets of 3/0
      		 500 kcmil or
      two sets of 250 kcmil
      		 350
      		 2d
      		1/0d
      400 kcmil
      or two sets of 4/0
      		 600 kcmil or
      two sets of 300 kcmil
      		 400
      		 1/0d
      		3/0d


      For SI: 1 inch = 25.4 mm.
      a. Where protected by a metal raceway, grounding electrode conductors shall be electrically bonded to the metal raceway at both ends.
      b. Eight AWG grounding electrode conductors shall be protected with metal conduit or nonmetallic conduit.
      c. Where not protected, 6 AWG grounding electrode conductors 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.
      d. Where the sole grounding electrode system is a ground rod or pipe as covered in Section E3508.2, 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
      E3508.1.2      , the grounding electrode conductor shall not be required to be larger than 4 AWG copper conductor.