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 greater than 1 inch.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.įor SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 degree = 0.0175 rad. 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. 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 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. TABLE E3802.1 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" )
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