Metal conduit, tubing, and metal outlet boxes shall be connected to an equipment grounding conductor complying with Section E3908.14. The cable shall be secured within 12 inches (305 mm) of the point where the cable enters the conduit or tubing.
The sheath of the Type NM or SE cable shall extend through the conduit or tubing and into the outlet or device box not less than 1/ 4 inch (6.4 mm). Conduit or tubing shall be provided with a suitable insulating bushing or adapter at the point where the cable enters the raceway. Type NM or SE cable installed on the wall of an unfinished basement shall be permitted to be installed in a listed conduit or tubing or shall be protected in accordance with Table E3802.1. Smaller cables shall be run either through bored holes in joists or on running boards. Where Type NM or SE cable is run at angles with joists in unfinished basements and crawl spaces, cable assemblies containing two or more conductors of sizes 6 AWG and larger and assemblies containing three or more conductors of sizes 8 AWG and larger shall not require additional protection where attached directly to the bottom of the joists. See Sections R502.8 and R802.7 for additional limitations on the location of bored holes in horizontal framing members.Bushings and grommets shall remain in place and shall be listed for the purpose of cable protection.Flat cables shall not be stapled on edge.
Within 8 inches of boxes without cable clamps.Where flexibility after installation is necessary, lengths of flexible metal conduit and liquidtight flexible metal conduit measured from the last point where the raceway is securely fastened shall not exceed: 36 inches for trade sizes 1/ 2 through 1 1/ 4, 48 inches for trade sizes 1 1/ 2 through 2, and 5 feet for trade sizes 2 1/ 2 and larger.Twenty-four inches for Type AC cable and 36 inches for interlocking Type MC cable where flexibility is necessary.Two and one-half feet where used for service or outdoor feeder and 4.5 feet where used for branch circuit or indoor feeder.Five feet for trade sizes 1 1/ 4 through 2 inches, 6 feet for trade sizes 2 1/ 2 through 3, 7 feet for trade sizes 3 1/ 2 through 5 inches, 8 feet for trade size 6 inches.Supports not required in accessible ceiling spaces between light fixtures where lengths do not exceed 6 feet.Installed in accordance with listing requirements.Maximum support distance in inches from box or other terminations. Maximum allowable on center support spacing for the wiring method in feet. The maximum number of 90-degree bends shall not exceed four between junction boxes.īushings shall be provided where entering a box, fitting or enclosure unless the box or fitting is designed to afford equivalent protection.Įnds of raceways shall be reamed to remove rough edges. Securely fastened bushings or grommets shall be provided to protect wiring run through openings in metal framing members.
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Where installed in grooves, to be covered by wallboard, siding, paneling, carpeting, 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 1 1/ 4-inch free space for the full length of the groove in which the cable or raceway is installed. Where run parallel with the framing member or furring strip, the wiring shall be not less than 1 1/ 4 inches from the edge of a furring strip or a framing member such as a joist, rafter or stud or shall be physically protected.īored holes in framing members for wiring shall be located not less than 1 1/ 4 inches from the edge of the framing member or shall be protected with a minimum 0.0625-inch steel plate or sleeve, a listed steel plate or other physical protection.
GENERAL INSTALLATION AND SUPPORT REQUIREMENTS FOR WIRING METHODS a, b, c, d, e, f, g, h, i, j, k INSTALLATION REQUIREMENTS (Requirement applicable only to wiring methods marked "A" ) Run exposed and subject to physical damage In masonry voids and cells not exposed to dampness In masonry voids and cells exposed to dampness or below grade line In noncinder concrete in contact with gradeĮmbedded in plaster not exposed to dampness ALLOWABLE APPLICATIONS FOR WIRING METHODS a, b, c, d, e, f, g, h, i, j, k ALLOWABLE APPLICATIONS (application allowed where marked with an "A")Įmbedded in noncinder concrete in dry location
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