UL 499:2008 pdf download – Electric Heating Appliances
UL 499:2008 pdf download – Electric Heating Appliances.
40.3.3 For a medicanient vaporizer of the resistance-wire type, the endurance test of a thermostat is to consist of 100,000 cycles under load.
40.4 Limited short circuit test for motor-control devices
40.4.1 There shall not be any ignition of cotton surrounding the outer enclosure of the protective device, that, in some cases, will be the enclosure of the motor that it protects, when three samples of a device controlling a 1/2 hp or smaller motor are subjected to short circuits on a circuit limited to 200 A, and when three samples of a device contro4ing a motor larger than 1/2 tip are subjected to short circuits on a circuit limited to 1000 A.
40,4.2 A motor is to be considered to comply with the requirement in 40,4,1 if it is equipped with an inhefent overheating protector that complies with the requirements for such protectors.
40.4.3 For the tests mentioned in 40.4.1, the power factor of the test circuit is to be 0.9— LO, and the circuit capacity is to be measured without the device in the circuit.
40,4,4 In each case. a nonrenewable cartndge fuse is to be connected in series with the device under test: the fuse is to be of the maximum current rating that wl be accommodated by a fusetiolder of the branch circuit to which the product would be connected. The test on one sample is to be made by closing the device on the short circuit.
41 StraIn RelIef Test
41.1 The strain-relief means provided on an attached flexible cord, when tested in accordance with 41.2, shall be capable of withstanding for 1 minute, without displacement, a pull of 35 lbf (156 N) applied to the cord, with the connections within the product disconnected.
Exception: The cord on a sokienng iron or wood-burning pencil having a mass of not more than 1,2 lb (0.227 kg) exclusive of the cord shall withstand a pull of 20 ibi (89 N).
41.2 The strain relief means provided on leads as mentioned in the Exception to 10.1.5 when tested in
accordance with 41.3, shall be capable of withstanding for 1 minute without displacement a pull of 5 lbf
(22 N) applied to the leads with connections at the termination disconnected.
41.3 The specified force Is to be applied to the cord or leads, and the product so supported that the strain-relief means will be stressed from any angle that the oonstrucbon of the product permits. The strain-relief is not acceptable if, at the point of disconnection of the conductors, there is sufficient movement of the cord or leads, to indicate that stress on the connections would have resulted.
42 Push-Back Relief Test
42.1 To determine compliance with 11.2.3. a product shall be tested in accordance with 42.2 without occurrence of any of the following conditions:
a) The supply cord is subjected to mechanical damage:
b) The supply cord is exposed to a temperature higher than that for which it is rated;
C) Spacings, such as to a metal strain-relief damp, are reduced below the minimum required values: or
d) Internal connections or components are damaged
42.2 The supply cord is to be held 1 inch (25.4 mm) from the point where the cord emerges from the product or cord bushing, when provided, and is then to be pushed back into the product, The cord is to be pushed back into the product in 1 inch (25.4 mm) increments until the cord buckles or the force to push the cord into the product exceeds 6 pounds-force (26.7 N), The supply cord within the product is to be manipulated to determine compliance with 42.1.
43 Test for Permanence of Cord Tag for Outdoor-Use Heating Appliances with Power-Supply Cords Less than 6 Feet (1.8 m)
431 These tests are intended for tags employed with outdoor-use heating appliances requiring the marking of 47.33 with power-supply cords less than 6 ft (1.8 m), other than as mentioned in 47.14.
4.3.2 To determine compliance with 4734, representative samples that have been subjected to the tests described in 43.4 — 43.7 shall meet the following requirements:
a) The lag shall resist tearing for longer than 1/16 inch (1.6 mm) at any point;
b) The tag shall not separate from the power-supply cord;
C) There shall be no permanent shrinkage, deformation, cracking, or any other condition that will render the marking on the tag illegible: and
d) Overlamination shall remain in place and not be torn or otherwise damaged. The printing shall remain legible.
43.3 For each type of conditioning mentioned in 43.4 — 43.6, three samples of the tag applied to the power-supply cord in the intended manner are to be used. If tags are applied by an adhesive, tests are to be conducted no sooner than 25 hours after application of the tag.