Page 740 - 2018_IRC

BRANCH CIRCUIT AND FEEDER REQUIREMENTS

TABLE E3702.14 (Table 210.24) less than one 120-volt, 20-ampere branch circuit shall be
BRANCH-CIRCUIT REQUIREMENTS-SUMMARY a, b installed to supply receptacle outlets in attached garages and
CIRCUIT RATING in detached garages with electric power. This circuit shall not

15 amp 20 amp 30 amp have other outlets.
Conductors: Exception: This circuit shall be permitted to supply read-
Minimum size (AWG) 14 1 10 ily accessible outdoor receptacle outlets.
circuit conductors
E3703.6 Number of branch circuits. The minimum number
Maximum overcurrent-
protection device rating 15 2 30 of branch circuits shall be determined from the total calcu-
Ampere rating lated load and the size or rating of the circuits used. The num-
Outlet devices: ber of circuits shall be sufficient to supply the load served. In
Lampholders permitted Any type Any type N/A no case shall the load on any circuit exceed the maximum
Receptacle rating (amperes) 15 maximum 15 or 20 30 specified by Section E3702. [210.11(A)]
Maximum load (amperes) 15 20 30 E3703.7 Branch-circuit load proportioning. Where the
branch-circuit load is calculated on a volt-amperes-per-
a. These gages are for copper conductors. square-foot (m ) basis, the wiring system, up to and including
2
b. N/A = Not Allowed.
the branch-circuit panelboard(s), shall have the capacity to
serve not less than the calculated load. This load shall be
SECTION E3703 evenly proportioned among multioutlet branch circuits within
REQUIRED BRANCH CIRCUITS the panelboard(s). Branch-circuit overcurrent devices and cir-
E3703.1 Branch circuits for heating. Central heating equip- cuits shall only be required to be installed to serve the con-
ment other than fixed electric space heating shall be supplied nected load. [210.11(B)]
by an individual branch circuit. Permanently connected air-
conditioning equipment, and auxiliary equipment directly
associated with the central heating equipment such as pumps, SECTION E3704
motorized valves, humidifiers and electrostatic air cleaners, FEEDER REQUIREMENTS
shall not be prohibited from connecting to the same branch E3704.1 Conductor size. Feeder conductors that do not
circuit as the central heating equipment. (422.12 and 422.12 serve 100 percent of the dwelling unit load and branch-circuit
Exceptions No. 1 and No. 2) conductors shall be of a size sufficient to carry the load as
determined by this chapter. Feeder conductors shall not be
E3703.2 Kitchen and dining area receptacles. A minimum
of two 20-ampere-rated branch circuits shall be provided to required to be larger than the service-entrance conductors that
serve all wall and floor receptacle outlets located in the supply the dwelling unit. The load for feeder conductors that
kitchen, pantry, breakfast area, dining area or similar area of a serve as the main power feeder to a dwelling unit shall be
dwelling. The kitchen countertop receptacles shall be served determined as specified in Chapter 36 for services.
by a minimum of two 20-ampere-rated branch circuits, either [310.15(B)(7)(2) and (3)]
or both of which shall also be permitted to supply other E3704.2 Feeder loads. The minimum load in volt-amperes
receptacle outlets in the same kitchen, pantry, breakfast and shall be calculated in accordance with the load calculation
dining area including receptacle outlets for refrigeration procedure prescribed in Table E3704.2(1). The associated
appliances. [210.11(C)(1) and 210.52(B)(1) and (B)(2)] table demand factors shall be applied to the actual load to
determine the minimum load for feeders. (220.40)
Exception: The receptacle outlet for refrigeration appli-
ances shall be permitted to be supplied from an individual E3704.3 Feeder neutral load. The feeder neutral load shall
branch circuit rated 15 amperes or greater. [210.52(B)(1) be the maximum unbalance of the load determined in accor-
Exception No. 2] dance with this chapter. The maximum unbalanced load shall
be the maximum net calculated load between the neutral and
E3703.3 Laundry circuit. A minimum of one 20-ampere-
rated branch circuit shall be provided for receptacles located any one ungrounded conductor. For a feeder or service sup-
in the laundry area and shall serve only receptacle outlets plying electric ranges, wall-mounted ovens, counter-mounted
located in the laundry area. [210.11(C)(2)] cooking units and electric dryers, the maximum unbalanced
load shall be considered as 70 percent of the load on the
E3703.4 Bathroom branch circuits. A minimum of one 20- ungrounded conductors. [220.61(A) and (B)]
ampere branch circuit shall be provided to supply bathroom
receptacle outlet(s). Such circuits shall have no other outlets. E3704.4 Lighting and general use receptacle load. A unit
[210.11(C)(3)] load of not less than 3 volt-amperes shall constitute the mini-
mum lighting and general use receptacle load for each square
Exception: Where the 20-ampere circuit supplies a single foot of floor area (33 VA for each square meter of floor area).
bathroom, outlets for other equipment within the same The floor area for each floor shall be calculated from the out-
bathroom shall be permitted to be supplied in accordance side dimensions of the building. The calculated floor area shall
with Section E3702. [210.11(C)(3) Exception] not include open porches, garages, or unused or unfinished
E3703.5 Garage branch circuits. In addition to the number spaces not adaptable for future use. [220.12, Table 220.12, and
of branch circuits required by other parts of this section, not 220.14(J)]

2018 INTERNATIONAL RESIDENTIAL CODE ® 715
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