UL 935:2001 pdf download Fluorescent-Lamp Ballasts
1 Scope
1.1 These requirements cover ballasts of the resistance, reactance, and electronic (high frequency) typesfor use with fluorescent lamps involving a potential of 2500 volts or less in accordance with the NationaElectrical CodeANSI/NFPA 70.
1.2 A fluorescent-lamp ballast may be determined by investigation to be acceptable for use, in a fixtureor other device, with electric-discharge lamps of other than the fluorescent type.
1.3 Fluorescent self ballasted lamps and ballast adaptors are evaluated using the Standard forSelf-Ballasted Lamps and Lamp Adapters, UL 1993. The component ballast is evaluated to requirementsin this Standard.
1.4 A product that contains features, characteristics, components, materials, or systems new or differentfrom those covered by the requirements in this standard, and that involves a risk of fire or of electric shockor injury to persons shall be evaluated using appropriate additional component and end-productrequirements to maintain the level of safety as originally anticipated by the intent of this standard.Aproduct whose features, characteristics, components, materials, or systems conflict with specificrequirements or provisions of this standard does not comply with this standard. Revision of requirementsshall be proposed and adopted in conformance with the methods employed for development, revision, andimplementation of this standard.
2 Glossary
2.1 For the purpose of this standard the following definitions apply.
2.2 BALLAST – A device that by means of reactance or resistance, singly or in combination, limits thecurrent of a lamp to the required value for proper operation and, where necessary, provides adequatestarting voltage; and in the case of rapid start circuits, provides for low-voltage lamp filament heating.
2.3 CHEESECLOTH – Used in abnormal condition tests as an indicator of a fire hazard. Bleachedcheesecloth is to be 36 inches (910 mm) wide, running 14 – 15 yards per pound (28 – 30 m/kg), andhave what is known to the trade as a count of 32 X 28: that is, for any sauare inch, 32 threads in onedirection and 28 threads in the other direction (for any square centimeter, 13 threads in one directionand 11 threads in the other direction).
2.4 CLASS P PROTECTED BALLAST – A ballast that is integrally protected from overheating, wherethe ballast and protection combination comply with the requirements in this standard.
2.5 COMPACT FLUORESCENT LAMP – A fluorescent lamp of a small compact shape (such as afolded construction) with all contacts terminating in a single base that performs the entire mechanicalsupport function.
2.6 CONDITIONED LAMP – A new lamp that has been operated for a minimum of 100 hours
2.7 CONVENTIONAL MAGNETIC BALLAST – A ballast that consists of a coil of wire wound on a coreand operates at the supply line frequency. A conventional magnetic ballast is either a transformer typeor simple reactance type. A power capacitor is able to be provided with the magnetic ballast.