UL 482 Standard For Portable Sun/Heat Lamps

12.2 Insulating material used in a sun/heat lamp is to be considered with respect to its acceptability for the particular application. Materials such as mica, some molded compounds, and certain refractory materials usually are acceptable for use as the sole support of live parts. Some other materials that are not acceptable for general use, such as magnesium oxide, may be accepted if used in conjunction with other more appropriate insulating materials or if so located and protected against mechanical damage and the absorption of moisture. If an investigation is necessary to determine the acceptability of a material, consideration will be given to its mechanical strength, dielectric strength, insulation resistance, heat resistant qualities, the degree to which it is enclosed or protected and any other features that have a bearing on the risk of fire, electric shock and personal injury involved in conjunction with the conditions of intended service.

12.3 In the mounting or supporting of small, fragile, insulating parts, screws or other fastenings should not be so tight as to result in cracking or breaking these parts due to expansion and contraction.

12.4 Combustible or electrically conductive heat-insulating material shall not make contact with uninsulated live parts of the lamp.

13.1 A female screw-shell used as a holder for a bulb or heating element shall be of copper or copper alloy and shall be plated with nickel or equivalent oxidation-resistant metal if it operates at a temperature of more than 200 degrees C (392 degrees F); or the screwshell shall be of other acceptable material.

13.2 A lampholder for a sunlamp shall be of a type other than the conventional right hand thread of the Edison medium base size.

14.1 A switch provided as a part of a sun/heat lamp shall be of a type intended for the particular application, and shall have a current and voltage rating not less than that of the load which it controls. A switch that controls a tungsten filament lamp shall be acceptable for such use.

14.2 A switch provided as part of a sun/heat lamp that uses a transformer shall have a voltage rating not less than that of the primary of the transformer. Unless accepted as being appropriate for that purpose, the switch shall have a current rating not less than twice the current input to the transformer, when loaded to the maximum intended value.

15.1 A sunlamp shall be provided with a timer as part of the lamp to function so as to automatically de-energize the lamp at the termination of the time setting on the timer. The timer may be either built-in (integral with the construction of the appliance) or in series with the supply cord.