Wiring methods shall be installed and supported in accordance with Table E3802.1.
GENERAL INSTALLATION AND SUPPORT REQUIREMENTS FOR WIRING METHODSa, b, c, d, e, f, g, h, i, j, k
|INSTALLATION REQUIREMENTS |
(Requirement applicable only to wiring methods marked "A" )
|Where run parallel with the framing member or furring strip, the wiring shall be not less than 11/4 inches from the edge of a furring strip or a framing member such as a joist, rafter or stud or shall be physically protected.||A||—||A||A||A||—||A||—||—|
|Bored holes in framing members for wiring shall be located not less than 11/4 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.||Ak||—||Ak||Ak||Ak||—||Ak||—||—|
|Where installed in grooves, to be covered by wallboard, siding, paneling, carpeting, or similar finish, wiring methods shall be protected by 0.0625-inchthick steel plate, sleeve, or equivalent, a listed steel plate or by not less than 11/4-inch free space for the full length of the groove in which the cable or raceway is installed.||A||—||A||A||A||—||A||A||A|
|Securely fastened bushings or grommets shall be provided to protect wiring run through openings in metal framing members.||—||—||Aj||—||Aj||—||Aj||—||—|
|The maximum number of 90-degree bends shall not exceed four between junction boxes.||—||A||A||A||—||A||—||—||—|
|Bushings shall be provided where entering a box, fitting or enclosure unless the box or fitting is designed to afford equivalent protection.||A||A||A||A||—||A||—||A||—|
|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.||4.5b, c||10l||3b||4.5b||4.5i||3d, l||2.5e||—||2.5|
|Maximum support distance in inches from box or other terminations.||12b, f||36||36||12b, g||12h, i||36||12||—||—|
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 degree = 0.0175 rad.
- Installed in accordance with listing requirements.
- Supports not required in accessible ceiling spaces between light fixtures where lengths do not exceed 6 feet.
- Six feet for MC cable.
- Five feet for trade sizes greater than 1 inch.
- Two and one-half feet where used for service or outdoor feeder and 4.5 feet where used for branch circuit or indoor feeder.
- Twenty-four inches where flexibility is necessary.
- 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 11/4, 48 inches for trade sizes 11/2 through 2 and 5 feet for trade sizes 21/2 and larger.
- Within 8 inches of boxes without cable clamps.
- Flat cables shall not be stapled on edge.
- Bushings and grommets shall remain in place and shall be listed for the purpose of cable protection.
- See Sections R502.8 and R802.7 for additional limitations on the location of bored holes in horizontal framing members.