25.10 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. 25.11 When operated under such abnormal conditions, a lamp is considered to involve a risk of fire if there is any emission of flame or molten metal or if operation of the lamp results in the glowing or flaming of combustible material upon which it may be placed. 25.12 A heat lamp with reference to the abnormal tests will generally require continuous operation for 7 or 8 hours in order to determine that the ultimate result has been observed. Any timer contacts are to be shorted during the abnormal tests. 25.13 A sunlamp with reference to the abnormal tests will generally require continuous operation for 7 or 8 hours in order to determine that the ultimate result has been observed. The timer contacts are to be shorted during the abnormal tests. Exception: If the timer has been tested and found to operate acceptably for 100,000 cycles of mechanical and electrical operation following the procedure in paragraphs 24.1 and 24.2, a sunlamp is first to be brought up to constant temperature before introducing the abnormal condition. The timer is then to be set at 10 minutes and the abnormal condition introduced.25.14 If a sun/heat lamp employs one or more semi-conductors, transistors, or similar components, a risk of fire, electric shock, or personal injury condition shall not develop when the circuit between any two terminals of any such component is short circuited or is opened at any terminal. If an electrolytic capacitor is employed a risk of fire, electric shock or personal injury condition shall not develop when the capacitor is shorted. Only one simulated fault condition is to be imposed at one time. 26. Strain Relief Test 26.1 The power supply cord of a sun/heat lamp shall be capable of withstanding a straight pull of 35 lbf (156 N) applied between the cord and the sun/heat lamp for 2 minutes. 26.2 The 35 lbf (156 N) pull is to be applied by suspending a 35 lb (15.9 kg) weight on the cord with the force applied in a direction normal to the plane of the cord-entry hole, with all supply-cord conductors severed immediately adjacent to the terminals or splices. If there is a movement of the cord of more than 1/16 inch (1.6 mm) at the point where the connections are severed, the strain relief is not acceptable. 26.3 Strain relief shall be provided so that a pull exerted on the flexible cord will not be transmitted directly to binding-screw terminals of the attachment plug. The assembly shall be capable of withstanding a straight pull of 30 lbf (133 N) applied between the cord and the plug.
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