Page 769 - 2018_IRC

POWER AND LIGHTING DISTRIBUTION

E3905.4 Minimum depth of boxes for outlets, devices, and port of luminaires and lampholders and shall be installed as
utilization equipment. Outlet and device boxes shall have an required by Section E3904.3. [314.27(A)]
approved depth to allow equipment installed within them to E3905.6.1 Vertical surface outlets. Boxes used at lumi-
be mounted properly and without the likelihood of damage to naire or lampholder outlets in or on a vertical surface shall
conductors within the box. (314.24) be identified and marked on the interior of the box to indi-
E3905.4.1 Outlet boxes without enclosed devices or uti- cate the maximum weight of the luminaire or lamp holder
lization equipment. Outlet boxes that do not enclose that is permitted to be supported by the box if other than
devices or utilization equipment shall have an internal 50 pounds (22.7 kg). [314.27(A)(1)]
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depth of not less than / inch (12.7 mm). [314.24(A)]
2 Exception: A vertically mounted luminaire or lam-
E3905.4.2 Utilization equipment. Outlet and device pholder weighing not more than 6 pounds (2.7 kg) shall
boxes that enclose devices or utilization equipment shall be permitted to be supported on other boxes or plaster
have a minimum internal depth that accommodates the rings that are secured to other boxes, provided that the
rearward projection of the equipment and the size of the luminaire or its supporting yoke is secured to the box
conductors that supply the equipment. The internal depth with not fewer than two No. 6 or larger screws.
shall include that of any extension boxes, plaster rings, or [314.27(A)(1) Exception]
raised covers. The internal depth shall comply with all of E3905.6.2 Ceiling outlets. For outlets used exclusively
the applicable provisions that follow. [314.24(B)] for lighting, the box shall be designed or installed so that a
Exception: Utilization equipment that is listed to be luminaire or lampholder can be attached. Such boxes shall
installed with specified boxes. be capable of supporting a luminaire weighing up to 50
pounds (22.7 kg). A luminaire that weighs more than 50
1. Large equipment. Boxes that enclose devices or
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utilization equipment that projects more than 1 / 8 pounds (22.7 kg) shall be supported independently of the
inches (48 mm) rearward from the mounting outlet box, unless the outlet box is listed for not less than
plane of the box shall have a depth that is not less the weight to be supported. The interior of the box shall be
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than the depth of the equipment plus / inch (6.4 marked by the manufacturer to indicate the maximum
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mm). [314.24(B)(1)] weight that the box is permitted to support. [314.27(A)(2)]
E3905.7 Floor boxes. Where outlet boxes for receptacles are
2. Conductors larger than 4 AWG. Boxes that
enclose devices or utilization equipment supplied installed in the floor, such boxes shall be listed specifically
by conductors larger than 4 AWG shall be identi- for that application. [314.27(B)]
fied for their specific function. [314.24(B)(2)] E3905.8 Boxes at fan outlets. Outlet boxes and outlet box
systems used as the sole support of ceiling-suspended fans
3. Conductors 8, 6, or 4 AWG. Boxes that enclose
devices or utilization equipment supplied by 8, 6, (paddle) shall be marked by their manufacturer as suitable for
or 4 AWG conductors shall have an internal this purpose and shall not support ceiling-suspended fans
depth that is not less than 2 / inches (52.4 mm). (paddle) that weigh more than 70 pounds (31.8 kg). For outlet
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[314.24(B)(3)] boxes and outlet box systems designed to support ceiling-sus-
pended fans (paddle) that weigh more than 35 pounds (15.9
4. Conductors 12 or 10 AWG. Boxes that enclose kg), the required marking shall include the maximum weight
devices or utilization equipment supplied by 12 or to be supported.
10 AWG conductors shall have an internal depth
that is not less than 1 / inches (30.2 mm). Where Where spare, separately switched, ungrounded conductors
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the equipment projects rearward from the mount- are provided to a ceiling-mounted outlet box and such box is
ing plane of the box by more than 1 inch (25.4 in a location acceptable for a ceiling-suspended (paddle) fan,
mm), the box shall have a depth that is not less the outlet box or outlet box system shall be listed for sole sup-
1
than that of the equipment plus / inch (6.4 mm). port of a ceiling-suspended (paddle) fan. [314.27(C)]
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[314.24(B)(4)] E3905.9 Utilization equipment. Boxes used for the support
of utilization equipment other than ceiling-suspended (pad-
5. Conductors 14 AWG and smaller. Boxes that
enclose devices or utilization equipment supplied dle) fans shall meet the requirements of Sections E3905.6.1
by 14 AWG or smaller conductors shall have a and E3905.6.2 for the support of a luminaire that is the same
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depth that is not less than / inch (23.8 mm). size and weight. [314.27(D)]
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[314.24(B)(5)] Exception: Utilization equipment weighing not more than
E3905.5 Boxes enclosing flush-mounted devices. Boxes 6 pounds (2.7 kg) shall be permitted to be supported on
enclosing flush-mounted devices shall be of such design that other boxes or plaster rings that are secured to other boxes,
the devices are completely enclosed at the back and all sides provided that the equipment or its supporting yoke is
and shall provide support for the devices. Screws for support- secured to the box with not fewer than two No. 6 or larger
ing the box shall not be used for attachment of the device screws. [314.27(D) Exception]
contained therein. (314.19) E3905.10 Conduit bodies and junction, pull and outlet
boxes to be accessible. Conduit bodies and junction, pull and
E3905.6 Boxes at luminaire outlets. Outlet boxes used at
luminaire or lampholder outlets shall be designed for the sup- outlet boxes shall be installed so that the wiring therein can
be accessed without removing any part of the building or

744 2018 INTERNATIONAL RESIDENTIAL CODE ®
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