UL 496:2008 pdf download – Lampholders.
SAl 1 These requirements cover base-to-base adapters, base reducers, lampholder-to-outtet adapters, switched and uriswitched lampholder-mounted current taps, socket extensions, and lampholder Y adaptefs.
SA2 General
SA2.1 A receptacle shall comply with the requirements in UI 498 and CSA C222 No. 42.
SA2.2 The lampholder adapters and load fittings mentioned in Clause SAl .1 shall comply with all of the applicable lampholder requirements of this Standard. except as modified by the requirements contained en this supplement.
SA2.3 A base-to-base adapter shall not permit a lamp with a different base to be installed in a GU24 or GU24-1 holder. This requirement does not prohib4t the use of an adapter to permit fluorescent and LED selt-ballasted lamps and fluorescent lamp adapters provided with GU24 or GU24-1 pin bases to be installed in a luminaire with an E26 lampholder.
SA3 Screwshell Size Adapters
SA3,1 The male screwshell of an adapter shall be of the same size or larger than that of the female screwshell of the adapter.
SA3,2 An E26 (medium) screw base shall have at least 3.25 mm (0.13 In) of distance between the bottom of the screwshell and the bottom of the eyelet contact. The minimum spacing over the surface of the insulating material or through air shall not be less than 3 mm (0.12 in).
SA3.3 An adapter not intended for use in a portable luminaire and marked in accordance with Clause SA3.4 is not required to comply with Clause SA3.2.
SA3.4 An adapter not intended for use in a portable luminaire that does not comply with the dimensional requirements in Clause SA3.2 shall be marked CAUTION — Risk of electric shock or fire. Do not install in a three-way lampholder.
SA3.5 The length of the male screw base of an adapter, measured vertically from the plane ot the eyelet contact to the plane of the rim of the screw base, shall not be greater than the minimum cavity depth indicated in Table 7.
SA3.6 The cap of a pIugtype lampholder shaM provide electrical connection through the device from screwshell to screwshell and from Center contact to center contact. If wire leads are supplied as a part of the cap for attachment to the wiring terminals of the body, the identification of the leads shall be in accordance with Clause
SA4 Lampholder Fittings
SA4,1 A lampholder fitting with a thermoplastic enclosure material and a female screwshell shall have a relative thermal index of 150 °C (302 F) in accordance with Clause
SA4.2 A lampholder fitting incorporating electronic circuits o controls, such as a photo-control. may have
a relative thermal index less than that indicated in Clause SA4.1, provided that the fitting is subjected to
a temperature test in accordance with Clause SA5.
SA5 Temperature Test of Lampholder Fitting
SA5.1 A lampholder fitting incorporating electronic circuits or controls, such as a photo-control, shall be tested in accordance with Clauses SA5. 1 — SA5.7. The maximum temperatures shall not exceed the rated temperature of the material or component used when corrected to a room ambient temperature of 25 C
(77 CF).
SA5.2 The lampholder filling shall be installed in a representative lamphoicter and tested in both the base up and base down orientations, unless It is obvious that one orientation would result in less severe heating
SA5.3 The lampholder titling shall be operated with the maximum wattage and the type ol lamp br which it is rated.
SA5.4 During the test, the lampholder fitting shall be energized at rated input voltage and frequency.
SA5.5 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 coniorm to the requirements specified in the initial calibration tolerances for thermocouples table in Temperature Measurement Thermocouples, ANSIISA MC96.1. 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
SA5.6 A thermocouple junction and the adjacent thermocouple lead wire shall be securely held in thermal contact with the surface of the material, whose temperature is being measured. In most cases, adequate thermal contact will result from securety cementing the thermocouple in place. If a metal surface is involved, brazing or soldering the thermocouple to the metal may be necessary.