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 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 4 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-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. ( Chapter 3 and 300.11) 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") Wiring methods shall be installed and supported in accordance with Table E3802.1. Type USE cable not permitted above ground except to terminate at the exterior of a building in an approved enclosure and protected in accordance with Section E3803.3.The insulated conductors under the metallic covering are listed for use in wet locations and a corrosion-resistant jackets is provided over the metallic sheath.A lead sheath or moisture -impervious jacket is provided under the metal covering.The metallic covering is impervious to moisture.In wet locations under any of the following conditions.Liquid-tight flexible nonmetallic conduit may be encased in concrete where listed for direct burial and only straight connectors listed for use with LFNC are used.Conduit shall not exceed 6 feet in length.Shall be listed as "sunlight resistant" where exposed to the direct rays of the sun.Aluminum RMC requires approved supplementary corrosion protection. Metal raceways shall be protected from corrosion and approved for the application.Shall be listed as "sunlight resistant.".Conductors shall be a type approved for wet locations and the installation shall prevent water from entering other raceways.The grounded conductor shall be insulated.Type USE cable shall not be used inside buildings.Liquid-tight flexible nonmetallic conduit without integral reinforcement within the conduit wall shall not exceed 6 feet in length.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 ( Chapter 3 and 300.2) TABLE E3801.4 ALLOWABLE APPLICATIONS FOR WIRING METHODS a, b, c, d, e, f, g, h, i, j, k, l ALLOWABLE APPLICATIONS (application allowed where marked with an "A")Įmbedded in noncinder concrete in dry location Wiring methods shall be applied in accordance with Table E3801.4.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |