Page 744 - 2018_IRC

BRANCH CIRCUIT AND FEEDER REQUIREMENTS

is to be sealed with thermal insulation, caulk or sealing TABLE E3705.5.3 [240.4(D)]
foam, the allowable ampacity of each conductor shall be OVERCURRENT-PROTECTION RATING
adjusted in accordance with Table E3705.3. Where more COPPER ALUMINUM OR COPPER-CLAD
than two NM cables containing two or more current-carry- ALUMINUM
ing conductors are installed in contact with thermal insula- Size Maximum overcurrent- a Size Maximum overcurrent- a
tion without maintaining spacing between cables, the (AWG) protection-device rating (AWG) protection-device rating
(amps)
(amps)
allowable ampacity of each conductor shall be adjusted in
accordance with Table E3705.3. (334.80 and 334.112) 14 15 1 15
12 20 1 25
E3705.4.5 Conductors of Type SE cable. Where used as
a branch circuit or feeder wiring method within the interior 10 30 8 30
of a building and installed in thermal insulation, the a. The maximum overcurrent-protection-device rating shall not exceed the
ampacity of the conductors in Type SE cable assemblies conductor allowable ampacity determined by the application of the
with ungrounded conductor sizes 10 AWG and smaller correction and adjustment factors in accordance with Sections E3705.2
shall be in accordance with the 60°C (140°F) conductor and E3705.3.
temperature rating. The maximum conductor temperature E3705.5.4 Air-conditioning and heat pump equipment.
rating shall be permitted to be used for ampacity adjust- Air-conditioning and heat pump equipment circuit con-
ment and correction purposes, provided that the final der- ductors shall be permitted to be protected against overcur-
ated ampacity does not exceed that for a 60°C (140°F) rent in accordance with Section E3702.11. [240.4(G)]
rated conductor. [338.10(B)(4)(a)]
E3705.6 Fuses and fixed trip circuit breakers. The stan-
E3705.5 Overcurrent protection required. All ungrounded dard ampere ratings for fuses and inverse time circuit break-
branch-circuit and feeder conductors shall be protected ers shall be considered to be 15, 20, 25, 30, 35, 40, 45, 50, 60,
against overcurrent by an overcurrent device installed at the 70, 80, 90, 100, 110, 125, 150, 175, 200, 225, 250, 300, 350
point where the conductors receive their supply. Overcurrent and 400 amperes. (240.6)
devices shall not be connected in series with a grounded con-
ductor. Overcurrent protection and allowable loads for branch E3705.7 Location of overcurrent devices in or on prem-
circuits and for feeders that do not supply the entire load ises. Circuit breakers and switches containing fuses shall:
associated with a one-family dwelling or the entire load asso- 1. Be readily accessible. [240.24(A)]
ciated with an individual dwelling unit in a two-family dwell-
ing shall be in accordance with this chapter. 2. Not be located where they will be exposed to physical
damage. [240.24(C)]
Branch-circuit conductors and equipment shall be pro-
tected by overcurrent protective devices having a rating or 3. Not be located where they will be in the vicinity of easily
setting not exceeding the allowable ampacity specified in ignitible material such as in clothes closets. [240.24(D)]
Table E3705.1 and Sections E3705.2, E3705.3 and E3705.4
except where otherwise permitted or required in Sections 4. Not be located in bathrooms. [240.24(E)]
E3705.5.1 through E3705.5.3. [240.4, 240.21, and 5. Not be located over steps of a stairway.
310.15(B)(7)(2)]
6. Be installed so that the center of the grip of the operat-
E3705.5.1 Cords. Cords shall be protected in accordance ing handle of the switch or circuit breaker, when in its
with Section E3909.2. [240.5(B)] highest position, is not more than 6 feet 7 inches (2007
E3705.5.2 Overcurrent devices of the next higher rat- mm) above the floor or working platform. [240.24(A)]
ing. The next higher standard overcurrent device rating, Exceptions:
above the ampacity of the conductors being protected,
shall be permitted to be used, provided that all of the fol- 1. This section shall not apply to supplementary over-
lowing conditions are met: current protection that is integral to utilization
1. The conductors being protected are not part of a equipment. [240.24(A)(2)]
branch circuit supplying more than one receptacle 2. Overcurrent devices installed adjacent to the utiliza-
for cord- and plug-connected portable loads. tion equipment that they supply shall be permitted to
2. The ampacity of conductors does not correspond be accessible by portable means. [240.24(A)(4)]
with the standard ampere rating of a fuse or a circuit E3705.8 Ready access for occupants. Each occupant shall
breaker without overload trip adjustments above its have ready access to all overcurrent devices protecting the
rating (but that shall be permitted to have other trip conductors supplying that occupancy. [240.24(B)]
or rating adjustments).
3. The next higher standard device rating does not E3705.9 Enclosures for overcurrent devices. Overcurrent
exceed 400 amperes. [240.4(B)] devices shall be enclosed in cabinets, cutout boxes, or equip-
ment assemblies. The operating handle of a circuit breaker
E3705.5.3 Small conductors. Except as specifically per- shall be permitted to be accessible without opening a door or
mitted by Section E3705.5.4, the rating of overcurrent pro- cover. [240.30(A) and (B)]
tection devices shall not exceed the ratings shown in Table
E3705.5.3 for the conductors specified therein. [240.4(D)]

2018 INTERNATIONAL RESIDENTIAL CODE ® 719
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