UL 496-2017 pdf download

UL 496-2017 pdf download.Lampholders.
5.2.14.5 Rain test
5.2.14.5,1 When tested as described in Clauses 5.2.145.2 — 5.2.14.5.4, the construction of a lampholder intended for use in wet locations shall not permit the entrance of water into the lampholder body, including the lamp cavity.
5.2.14.5.2 The intended lamp shall be inserted in the unenergized lampholder. ibe lampholder and lamp assembly shall be subec1ed for one hour to a downward spray 01 water applied at an angle of 45 degrees to the vertical, in the direction or directions most likely to cause water to enter the lampholder.
5.2.14.5.3 The water spray test apparatus shall consist of three spray heads mounted as shown in Figure
10, The spray heads shaH be constructed in accordance with Figure 11. The water pressure at each spray head shall be maintained at approximately 34.5 kNJm2 (5 lbf/in2). The lampholder assembly shall be positioned in the focal area of the three spray heads such that the greatest quantity of water is likely to enter the lampholder.
5.2.14.5.4 After exposure to the water spray, each lampholder shall be individually subjected to the dielectnc voltage-withstand test, Clause 5.2.14.6.
5.2.14.6 DielectrIc voltage-withstand test
5.2.14.6.1 When tested as described in Clause 5.2.14.6.2, a lampholder shall withstand without breakdown the application of a 60 Hz essentially sinusoidal potential of:
a) 500 V for a lampholder rated 250 V or less: or
b) 1500 V for a lampholder rated greater than 250 V.
applied for 1 minute between the screwshell contact and the center contact of the larnpholder and between live parts and the lampholder and lamp assembly covered In foil.
52.14.6.2 The test shall be conducted without lamps installed in the lampholders. Each lampholder that has been subfected to the rain test of Clause 5.2.14.5 shall be tested as described In Clause 5.1.4.2.
5.2.15 Insulation-Piercing Terminal Lampholder Temperature Tests
5.2.15.1 General
5.2.15.1.1 A screw lampholder employing insulation-piercing terminals specified for use wim Type SP, SPE, or SPT flexible cord, as indicated in Clause 4.8.3.4, shall be tested in accordance with Clauses 5.2.15.1.2 to 5.2.15.5.4.
5,2.15,1.2 All values for temperature are based on an ambient of 25 C (77 °F). The temperature test may be conducted at any ambient temperature within the range of 10 — 40 ‘C (50— 140 CF).
5.2.15.1.3 Temperatures shall be measured by thermocouples consisting of wire not larger than 24 AWG (0.21 mm2) and not smaller than 30 AWG (0.05 mm2). The thermocouples and the related instrument shall be accurate and calibrated in accordance with standard laboratory practice. The thermocouple wires shall conform with the requirements specified In the Tolerance of Initial Values of EMF versus Temperature tables in ANSI/ASTM E2301E230M. Thermocouples using iron and constantan 30 AWG (0.05 mm2) wire shall be used with a potentiometer-type instrument whenever a referee temperature measurement by thermocouple Is necessary.
5.2.15.1.4 Thermocouples shall be placed on the wire insulation as close to the terminal connections as possible. They shall be placed in the same location on each lamplolder tested.
5.2.15.1.5 Unless otherwise specified, each test shall be continued until constant temperatures are obtained. A temperature shall be considered constant ii:
a) the test has been running for at least three hours; and
b) three successive readings, taken at 15-minute intervals, are within 1 °C (1.8 °F) of each other and are still not rising.
52.15,2 Temperature test — thermal cycling
5.2.152.1 S4x previously untested lampholders shall be assembled to conductors 01 the size and type for which they are intended. The lampholders shall be connected to the rated load and the temperature of the insulation-piercing terminal connections shall be monitored continuously with thermocouples. The devices shall be operated for a period of seven hours and the temperature of the insulation-piercing terminal connections recorded,
5.2.15.2.2 The same six lampholders shall be cycled for a total of 180 cycles at a rate of 3-1/2 hours on and 1/2 hour off. The temperatures of the insulation-piercing terminal connections shall be monitored continuously throughout the 180 cycle period. After the last cycle, the lampholders shall be energized for a period of seven hours, after which temperatures shall again be measured. The off cycle time may be extended lot the convenience of measurement.