UL 482 Standard For Portable Sun/Heat Lamps

22.3 In determining compliance with paragraph 22.1 all measurement errors and statistical uncertainties in the measurement process and, wherever applicable, changes in radiation emission or degradation in radiation safety with age of the product are to be considered.

23.1 A sun/heat lamp shall not attain a temperature at any point high enough to constitute a risk of fire or to damage any material used in the appliance, nor to indicate temperature rises to specific points greater than those indicated in Table 23.1.

23.2 During the test, the sun/heat lamp is to be supported in the intended manner on a horizontal softwood surface covered with two layers of white tissue paper. The test is to be continued until constant temperatures have been attained. See paragraph 23.6. Any timer contacts are to be shorted during this test.

23.3 An automatic temperature-regulating or limiting control or other protective device provided as a part of a sun/heat lamp is to be shunted out of the circuit during the temperature tests, unless the control has been shown by an appropriate investigation to be reliable, and unlikely to be defeated by the user.

23.4 All values for temperature rises in Table 23.1 are based on an assumed ambient temperature of 25 degrees C (77 degrees F); however, tests may be conducted at any ambient temperature within the range of 10—40 degrees C (50—104 degrees F).

23.5 Temperatures are to be measured by thermocouples consisting of wires not larger than No.24 AWG (0.21 mm(2) and not smaller than No.30 AWG (0.05 mm(2). The thermocouples and the related instrument are to be accurate and calibrated in accordance with standard laboratory practice. The thermocouple wires are to conform with the requirements for special thermocouples as listed in the table of limits of error in the Standard for Temperature Measurement Thermocouples, ANSI MC96.1-1982. Thermocouples using iron and constantan No. 30 AWG (0.05 mm(2) wires are to be used with a potentiometer-type instrument whenever a referee temperature measurement by the mocouple is necessary.

23.6 A temperature is considered to be constant when three successive readings, taken at intervals of 10 percent of the previously elapsed duration of the test, but not less than 5-minute intervals, indicate no change.

23.7 If the retention of the asbestos insulation of a heater cord depends upon a fabric braid, the braid shall not be removed nor subjected to a temperature rise of more than 65 degrees C (117 degrees F) unless other means are provided to hold the insulation in place. The jacket of Type HSJ cord shall not be subjected to a temperature rise of more than 35 degrees C (63 degrees F), and that of Type HS to a rise of more than 50 degrees C (90 degrees F), if the protection afforded by the jacket is required.

23.8 Stainless steel and other corrosion-resistant alloys may be used for current-carrying parts in a sun/heat lamp without restriction as to temperature. Plated iron or steel may be used for current-carrying parts where the material is subjected to temperature of more than 100 degrees C (212 degrees F), but plain (unplated) iron or steel is not acceptable, regardless of temperature.