UL 542:2003 pdf download Lampholders, Starters, and Starter Holders for Fluorescent Lamps
1 Scope
1.1 These requirements cover starters. starter holders, and lampholders intended for use with fluorescentlamps in accordance with the National Electrical Code. Starters for use with simple reactance-typefluorescent-lamp ballasts are intended for use in circuits involving a potential of 125 V maximum. Manualstarters incorporating a line switch are rated either 125 or 250 V. Starter holders are for use in circuitsinvolving a maximum of 250 V Lampholders are intended for use with fluorescent lamps involving apotential of 2500 V or less during either starting or operating conditions.
1.2 These requirements also cover lampholders intended for use with low-pressure sodium lamps
1.3 Deleted February 20, 2003
2 Components
2.1 Except as indicated in 2.2, a component of a product covered by this standard shall comply with therequirements for that component.
22 A component is not required to comply with a specific requirement that:a) lnvolves a feature or characteristic not required in the application of the component in theproduct covered by this standard, or
b) ls superseded by a requirement in this standard
2.3 A component shall be used in accordance with its rating established for the intended conditions ofuse.
2.4 Specific components are incomplete in construction features or restricted in performance capabilitiesSuch components are intended for use only under limited conditions, such as certain temperatures notexceeding specified limits, and shall be used only under those specific conditions.
3 Units of Measurement
3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory orapproximate information
4 References
4.1 Any undated reference to a code or standard appearing in the requirements of this standard shall beinterpreted as referring to the latest edition of that code or standard.
AUTOMATIC STARTERS
CONSTRUCTION
5 General
5.1 An automatic starter is a device that completes the circuit through the lamp filaments and the ballastwhen the line switch is closed to energize the circuit, and then opens this circuit automatically, after a timedelay. to impress voltage across the lamp.
6 Mechanical Assembly
6.1 An automatic starter shall be enclosed so that no live parts are exposed for persons to contact whilethe starter is installed as intended in a holder, and shall have the strength and rigidity necessary towithstand the abuses to which it is likely to be subjected.
7 Enclosure
7.1 An automatic starter shall be enclosed in a housing that, as measured on the flat surface, shall notbe less than 0.010 inch (0.25 mm) thick if of steel, not less than 0.015 inch (0.38 mm) thick if of othermetal, and not less than 1/32 inch (0.8 mm) thick if of phenolic composition.
7.2 An enclosure of iron or steel shall be protected against corrosion.
7.3 A metal enclosure shall be lined with insulating material. Fibrous material shall not be less than 0.008inch (0.20 mm) thick, and mica shall not be less than 0.004 inch (0.10 mm) thick.
Exception: Where permanent spacings of not less than 3/64 inch (1.2 mm) are maintained betweenuninsulated live parts and a metal enclosure, the liner need not be provided.
7.4 The enclosure may be formed with either:
a) One hole not more than 1/8 inch (3.2 mm) in diameter or more than 1/8 inch wide if slottedprovided that a lining such as described in 7.3 covers the opening, is securely held in place,and extends at least 1/8 inch beyond the edges of the opening on all sides; or
b) One hole that is not larger than 1/8 inch in diameter, provided that only a glass-enclosedglow switch, either with or without a parallel-connected capacitor, is housed.
UL 542:2003 pdf download
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