Page 748 - 2018_IRC

WIRING METHODS

TABLE E3802.1 (Chapter 3)
GENERAL INSTALLATION AND SUPPORT REQUIREMENTS FOR WIRING METHODS a, b, c, d, e, f, g, h, i, j, k
EMT
INSTALLATION REQUIREMENTS AC FMC NM RNC a
(Requirement applicable only to wiring methods marked “A” ) MC IMC ENT LFC UF RTRC SE SR USE
RMC
Where run parallel with the framing member or furring strip, the wiring shall
be not less than 1 / inches from the edge of a furring strip or a framing mem- A — A A A — A — —
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ber such as a joist, rafter or stud or shall be physically protected.
Bored holes in framing members for wiring shall be located not less than 1 / 4
1
inches from the edge of the framing member or shall be protected with a min- A k — A k A k A k — A k — —
imum 0.0625-inch steel plate or sleeve, a listed steel plate or other physical
protection.
Where installed in grooves, to be covered by wallboard, siding, paneling, car-
peting, or similar finish, wiring methods shall be protected by 0.0625-inch-
thick steel plate, sleeve, or equivalent, a listed steel plate or by not less than A — A A A — A A A
1 / -inch free space for the full length of the groove in which the cable or
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raceway is installed.
Securely fastened bushings or grommets shall be provided to protect wiring — — A j — A j — A j — —
run through openings in metal framing members.
The maximum number of 90-degree bends shall not exceed four between — A A A — A — — —
junction boxes.
Bushings shall be provided where entering a box, fitting or enclosure unless A A A A — A — A —
the box or fitting is designed to afford equivalent protection.
Ends of raceways shall be reamed to remove rough edges. — A A A — A — A —
Maximum allowable on center support spacing for the wiring method in feet. 4.5 b, c 10 3 b 4.5 b 4.5 i 3 d 2.5 e — 2 . 5
Maximum support distance in inches from box or other terminations. 12 b, f 36 36 12 b, g 12 h, i 36 12 — —

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 degree = 0.0175 rad.
a. Installed in accordance with listing requirements.
b. Supports not required in accessible ceiling spaces between light fixtures where lengths do not exceed 6 feet.
c. Six feet for MC cable.
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d. Five feet for trade sizes 1 / through 2 inches, 6 feet for trade sizes 2 / through 3, 7 feet for trade sizes 3 / through 5 inches, 8 feet for trade size 6 inches.
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2
e. Two and one-half feet where used for service or outdoor feeder and 4.5 feet where used for branch circuit or indoor feeder.
f. Twenty-four inches for Type AC cable and 36 inches for interlocking Type MC cable where flexibility is necessary.
g. Where flexibility after installation is necessary, lengths of flexible metal conduit and liquidtight flexible metal conduit measured from the last point where the
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raceway is securely fastened shall not exceed: 36 inches for trade sizes / through 1 / , 48 inches for trade sizes 1 / through 2, and 5 feet for trade sizes 2 / 2
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4
2
and larger.
h. Within 8 inches of boxes without cable clamps.
i. Flat cables shall not be stapled on edge.
j. Bushings and grommets shall remain in place and shall be listed for the purpose of cable protection.
k. See Sections R502.8 and R802.7 for additional limitations on the location of bored holes in horizontal framing members.
E3802.6 Cable-securing means. Cables shall be supported SECTION E3803
and secured by staples; cable ties listed and identified for UNDERGROUND INSTALLATION REQUIREMENTS
securement and support; or straps, hangers or similar fittings
designed and installed so as not to damage the cable. [320.30 E3803.1 Minimum cover requirements. Direct buried cable
(A), 330.30 (A), 334.30, 338.10 (B) (4), 340.10 (4)] or raceways shall be installed in accordance with the mini-
mum cover requirements of Table E3803.1. [300.5(A)]
E3802.7 Raceways exposed to different temperatures. E3803.2 Warning ribbon. Underground service conductors
Where portions of a raceway or sleeve are known to be sub- that are not encased in concrete and that are buried 18 inches
jected to different temperatures and where condensation is (457 mm) or more below grade shall have their location iden-
known to be a problem, as in cold storage areas of buildings tified by a warning ribbon that is placed in the trench not less
or where passing from the interior to the exterior of a build- than 12 inches (305 mm) above the underground installation.
ing, the raceway or sleeve shall be filled with an approved [300.5(D)(3)]
material to prevent the circulation of warm air to a colder sec-
tion of the raceway or sleeve. [300.7(A)] E3803.3 Protection from damage. Direct buried conductors
and cables emerging from the ground shall be protected by
E3802.8 Raceways in wet locations above grade. Where enclosures or raceways extending from the minimum cover
raceways are installed in wet locations above grade, the inte- distance below grade required by Section E3803.1 to a point
rior of such raceways shall be considered to be a wet location. at least 8 feet (2438 mm) above finished grade. In no case
Insulated conductors and cables installed in raceways in wet shall the protection be required to exceed 18 inches (457 mm)
locations above grade shall be listed for use in wet locations. below finished grade. Conductors entering a building shall be
(300.9)
2018 INTERNATIONAL RESIDENTIAL CODE ® 723
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