UL 482 Standard For Portable Sun/Heat Lamps

8.1 Under any condition of operation—including open- circuit secondary, if the lamp employs an autotransformer—no part of a sun/heat lamp shall have a potential of more than 150 V to ground or to either conductor of the power-supply cord, when it is connected to a supply circuit of maximum rated voltage. If such a lamp has a 2-winding transformer, the maximum difference of potential in the secondary under any condition of operation (including open-circuit secondary) shall be 300 V or less.

9.1 If a sun/heat lamp is provided with a directly attached flexible cord, an attachment plug shall be provided on the cord for connection to the supply circuit. If a directly attached flexible cord is not provided, the lamp shall have terminals using male pins, blades or the equivalent that will accommodate an acceptable plug. See paragraphs 9.4,9.5 and 18.2.

9.2 A sun/heat lamp employing a screw shelltype lamp-holder shall have an attachment plug of either the grounding or polarized type. The grounded conductor of the cord is to be connected to the screwshell of the lampholder and to the grounded blade of the attachment plug. See paragraph 32.7.

9.3 The ampacity of the flexible cord shall be not less than the rated current of the sun/heat lamp.

9.4 Flexible cord provided as part of a sun/heat lamp shall be Type SP-1 or SPT-1, or shall be Type HPD or HPN if the lamp produces a temperature of more than 121 degrees C (250 degrees F) on a surface with which the cord is likely to make contact; or the cord shall be of a type having such properties that it will be at least equally serviceable for the particular application.

9.5 Strain relief shall be provided in the lamp and in fittings of the power-supply cord so that a stress on the cord will not be transmitted to the terminals or wiring inside the lamp or to the terminals of fittings. See Section 26.

9.6 If a knot in a flexible cord serves as strain relief, the surface against which the knot may bear or with which it may come in contact shall be free from projections, sharp edges, burrs, fins, and the like that might damage the insulation of the conductors.

9.7 Means shall be provided to prevent the cord from being pushed into the appliance through the cord entry hole if such displacement is likely to subject the cord to mechanical damage, expose the cord to a temperature higher than that for which the cord is rated, or reduce spacings below acceptable values.

10.1 At a point where a flexible cord passes through an opening in a wall, barrier, or enclosing case, there shall be a bushing or the equivalent, that shall be secured in place, and shall have a smoothly rounded surface against which the cord may bear. If Type SP-1, SPT-1, SP-2, SPT-2, HPN, HPD or other cord lighter than HSJ is used, if the wall or barrier is of metal and if the construction is such that the cord may be subjected to strain or motion, an insulating bushing shall be provided. The heat-and moisture-resistant properties of the bushing material shall be acceptable for the particular application.