UL 482 Standard For Portable Sun/Heat Lamps

10.2 If the cord hole is in porcelain, phenolic composition, or other acceptable non-conducting material, a smoothly rounded surface is considered to be the equivalent of a bushing.

10.3 Ceramic materials and some molded compositions are acceptable generally for insulating bushings; but separate bushings of wood, so-called hot-molded shellac and tar compositions, or rubber materials are not acceptable.

10.4 Fiber may be used if the bushing is not less than 3/64 inch (1.2 mm) thick and if it is so formed and secured in place that it will not be adversely affected by conditions of ordinary moisture.

10.5 An insulated metal grommet may be accepted in place of an insulating bushing, provided that the insulating material used is not less than 1/32 inch (0.8 mm) thick and fills completely the space between the grommet and the metal in which it is mounted.

11.1 Insulated conductors used for the internal wiring of a sun/heat lamp shall be acceptable for the temperature and voltage to which they will be subjected in service.

11.2 An enclosure that houses wires shall be smooth and entirely free from sharp edges, burrs, fins and the like, that may cause abrasion of the insulation on conductors.

11.3 Insulated wires may be bunched and passed through a single opening in a metal wall within the enclosure of the sun/heat lamp.

11.4 The screw-shell of a lampholder and the terminal intended to be connected to the grounded circuit conductor, if any, of the attachment plug shall be connected to that conductor of the cord which is identified as the grounded circuit conductor. No single-pole switch shall be connected in that conductor.

11.5 A splice shall be made mechanically secure and shall provide reliable electrical contact.

11.6 A splice shall be provided with insulation equivalent to that of the wires involved unless permanence of spacing between the splice and other metal parts is provided.

12.1 Insulating washers, bushings and the like that are integral parts of a sun/heat lamp, and bases or supports for the mounting of live parts shall be of a moisture-resistant material that will not be adversely affected by the temperatures to which they will be subjected under conditions of intended use.