Page 739 - 2018_IRC

BRANCH CIRCUIT AND FEEDER REQUIREMENTS

used, the ampere rating or setting of the specified over-current E3702.10 Branch circuits serving heating loads. Electric
device shall determine the circuit rating. (210.18) space-heating and water-heating appliances shall be consid-
E3702.3 Fifteen- and 20-ampere branch circuits. A 15- or ered to be continuous loads. Branch circuits supplying two or
20-ampere branch circuit shall be permitted to supply lighting more outlets for fixed electric space-heating equipment shall
units, or other utilization equipment, or a combination of be rated not over 30 amperes. [424.3(A)]
both. The rating of any one cord-and-plug-connected utiliza- E3702.11 Branch circuits for air-conditioning and heat
tion equipment not fastened in place shall not exceed 80 per- pump equipment. The ampacity of the conductors supplying
cent of the branch-circuit ampere rating. The total rating of multimotor and combination load equipment shall be not less
utilization equipment fastened in place, other than luminaires, than the minimum circuit ampacity marked on the equipment.
shall not exceed 50 percent of the branch-circuit ampere rat- The branch-circuit overcurrent device rating shall be the size
ing where lighting units, cord-and-plug-connected utilization and type marked on the appliance. [440.4(B), 440.35]
equipment not fastened in place, or both, are also supplied. E3702.12 Branch circuits serving room air conditioners.
[210.23(A)(1) and (2)] A room air conditioner shall be considered as a single motor
E3702.4 Thirty-ampere branch circuits. A 30-ampere unit in determining its branch-circuit requirements where all
branch circuit shall be permitted to supply fixed utilization the following conditions are met:
equipment. A rating of any one cord-and-plug-connected uti- 1. It is cord- and attachment plug-connected.
lization equipment shall not exceed 80 percent of the branch-
circuit ampere rating. [210.23(B)] 2. The rating is not more than 40 amperes and 250 volts;
single phase.
E3702.5 Branch circuits serving multiple loads or outlets.
General-purpose branch circuits shall supply lighting outlets, 3. Total rated-load current is shown on the room air-condi-
appliances, equipment or receptacle outlets, and combina- tioner nameplate rather than individual motor currents.
tions of such. Multioutlet branch circuits serving lighting or 4. The rating of the branch-circuit short-circuit and
receptacles shall be limited to a maximum branch-circuit rat- ground-fault protective device does not exceed the
ing of 20 amperes. [210.23(A), (B), and (C)] ampacity of the branch-circuit conductors, or the rating
of the branch-circuit conductors, or the rating of the
E3702.6 Branch circuits serving a single motor. Branch- receptacle, whichever is less. [440.62(A)]
circuit conductors supplying a single motor shall have an
ampacity not less than 125 percent of the motor full-load cur- E3702.12.1 Where no other loads are supplied. The
rent rating. [430.22(A)] total marked rating of a cord- and attachment plug-con-
nected room air conditioner shall not exceed 80 percent of
E3702.7 Branch circuits serving motor-operated and the rating of a branch circuit where no other appliances are
combination loads. For circuits supplying loads consisting also supplied. [440.62(B)]
of motor-operated utilization equipment that is fastened in
1
place and that has a motor larger than / horsepower (0.093 E3702.12.2 Where lighting units or other appliances
8
kW) in combination with other loads, the total calculated load are also supplied. The total marked rating of a cord- and
shall be based on 125 percent of the largest motor load plus attachment plug-connected room air conditioner shall not
the sum of the other loads. [220.18(A)] exceed 50 percent of the rating of a branch circuit where
lighting or other appliances are also supplied. Where the
E3702.8 Branch-circuit inductive and LED lighting loads. circuitry is interlocked to prevent simultaneous operation
For circuits supplying luminaires having ballasts or LED driv- of the room air conditioner and energization of other out-
ers, the calculated load shall be based on the total ampere rat- lets on the same branch circuit, a cord- and attachment
ings of such units and not on the total watts of the lamps. plug-connected room air conditioner shall not exceed 80
[220.18(B)] percent of the branch-circuit rating. [440.62(C)]
E3702.9 Branch-circuit load for ranges and cooking E3702.13 Electric vehicle branch circuit. Outlets installed
appliances. It shall be permissible to calculate the branch-cir- for the purpose of charging electric vehicles shall be supplied
cuit load for one range in accordance with Table E3704.2(2). by an individual branch circuit. Each circuit shall not supply
The branch-circuit load for one wall-mounted oven or one other outlets. (625.40)
counter-mounted cooking unit shall be the nameplate rating
of the appliance. The branch-circuit load for a counter- E3702.14 Branch-circuit requirement—summary. The
mounted cooking unit and not more than two wall-mounted requirements for circuits having two or more outlets, or
ovens all supplied from a single branch circuit and located in receptacles, other than the receptacle circuits of Sections
the same room shall be calculated by adding the nameplate E3703.2, E3703.3 and E3703.4, are summarized in Table
ratings of the individual appliances and treating the total as E3702.14. Branch circuits in dwelling units shall supply only
equivalent to one range. (220.55 Note 4) loads within that dwelling unit or loads associated only with
that dwelling unit. Branch circuits installed for the purpose of
E3702.9.1 Minimum branch circuit for ranges. Ranges lighting, central alarm, signal, communications or other pur-
with a rating of 8.75 kVA or more shall be supplied by a poses for public or common areas of a two-family dwelling
branch circuit having a minimum rating of 40 amperes. shall not be supplied from equipment that supplies an individ-
[210.19(A)(3)] ual dwelling unit. (210.24 and 210.25)

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