other than factory-installed appliances, include the anticipated load.
FPN: Refer to Annex D, Example D12, for an illustration of the application of this calculation.
(C) Optional Method of Calculation for Lighting and Appliance Load. For park trailers, the optional method for calculating lighting and appliance load shown in
220.82 shall be permitted.
552.48 Wiring Methods.
(A) Wiring Systems. Cables and raceways installed in accordance with Articles 320, 322, 330 through 340, 342 through 362, 386, and 388 shall be permitted in accordance with their applicable article, except as otherwise specified in this article. An equipment grounding means shall be provided in accordance with
250.118.
(B) Conduit and Tubing. Where rigid metal conduit or intermediate metal conduit is terminated at an enclosure with a locknut and bushing connection, two locknuts shall be provided, one inside and one outside of the enclosure. All cut ends of conduit and tubing shall be reamed or otherwise finished to remove rough edges.
(C) Nonmetallic Boxes. Nonmetallic boxes shall be ac- ceptable only with nonmetallic-sheathed cable or nonmetallic raceways.
(D) Boxes. In walls and ceilings constructed of wood or other combustible material, boxes and fittings shall be flush with the finished surface or project therefrom.
(E) Mounting. Wall and ceiling boxes shall be mounted in accordance with Article 314.
Exception No. 1: Snap-in-type boxes or boxes provided with special wall or ceiling brackets that securely fasten boxes in walls or ceilings shall be permitted.
Exception No. 2: A wooden plate providing a 38-mm (Vh- in.) minimum width backing around the box and of a thickness of 13 mm (¥2 in.) or greater (actual) attached directly to the wall panel shall be considered as approved means for mounting outlet boxes.
(F) Sheath Armor. The sheath of nonmetallic-sheathed cable, metal-clad cable, and Type AC cable shall be con tinuous between outlet boxes and other enclosures.
(G) Protected. Metal-clad, Type AC, or nonmetallic- sheathed cables and electrical nonmetallic tubing shall be permitted to pass through the centers of the wide side of 2 by 4 wood studs. However, they shall be protected where they pass through 2 by 2 wood studs or at other wood studs or frames where the cable or tubing would be less than 32 mm (VA in.) from the inside or outside surface. Steel plates on each side of the cable or tubing, or a steel tube, with not less than
1.35 mm (0.053 in.) wall thickness, shall be installed to protect the cable or tubing. These plates or tubes shall be securely held in place. Where nonmetallic-sheathed cables pass through punched, cut, or drilled slots or holes in metal members, the cable shall be protected by bushings or grommets securely fastened in the opening prior to installation of the cable.
(H) Cable Supports. Where connected with cable connectors or clamps, cables shall be supported within
300 mm (12 in.) of outlet boxes, distribution panelboards, and splice boxes on appliances. Supports shall be provided every 1.4 m (4'/2 ft) at other places.