UL 935 CRD-2012 UL Standard for Safety Fluorescent-Lamp Ballasts - Section Paragraph Reference Supplement SC (new) Subject Ballasts intended to be dimmed using solid-state dimming e .pdf

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1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUNDERWRITERS LABORATORIES INC. CERTIFICATION REQUIREMENT DECISIONThis Certification Requirement Decision is prepared and published by Underwriters Laboratories Inc.(UL). It is normative for the a

2、pplicable UL Product Certification Program(s); however, it is currently notpart of the UL Standard(s) referenced below.Product Category (CCN): FKVS, FKVS7Standard Number: UL 935Edition Date: May 21, 2001Edition Number: 10Section / Paragraph Reference: Supplement SC (new)Subject: Ballasts intended to

3、 be dimmed using solid-state dimming controlselectrically wired in series with the mains supplyDECISION:SC - LINE-DIMMABLE FLUORESCENT BALLASTSSC1 ScopeSC1.1 The requirements in this supplement are applicable to ballasts that are marked or otherwiseindicated to be dimmable using a solid-state dimmin

4、g control electrically wired in series with the mainssupply.SC1.2 Ballasts with integral dimming functions controlled by external sources that do not affect the mainsvoltage powering the ballast (such as 0-10 volt dimmers, RF/carrier wave signals, etc.) shall additionallybe evaluated to the requirem

5、ents of Supplement SB.SC1.3 These requirements are not to be solely used in judging the acceptability of line-dimmable ballasts.The requirements in the main body of this Standard also apply, except as superseded by a requirementin this supplement.SC2 Normal Temperature and Abnormal Temperature Tests

6、SC2.1 The Normal Temperature test in clause 25 and the Abnormal Temperature test in clause 26, whenconducted, shall be conducted using the input power supply sources described below, in turn:a) The ballast shall be operated directly from the mains supply as required by clauses 21.6,21.7 and 21.9.b)

7、The ballast shall be operated with a single, appropriately rated semiconductor diode in series(half-wave rectification) with the ungrounded conductor of the supply described in (a).c) The ballast shall be operated with an adjustable dimmer electrically wired in series with thesupply described in (a)

8、. This dimmer shall have the following characteristics:1) It shall be an adjustable phase-cut type that does not contain any components in itsoutput circuitry for waveform smoothing,2) It shall produce an output waveform with a variable conduction angle similar to thatdepicted in Figure SC1, to be c

9、onfirmed by observing the input supply waveform to theballast using an oscilloscope; andUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL3) It shall be adjusted so the input current to the ballast is at the maximum RMS valuethat the ballast can

10、 draw.Exception: A ballast marked or otherwise identified for use only with specific dimmers shall be tested withthese specified dimmers in lieu of (b) and (c). The dimmers shall be adjusted so the input current to theballast is at the maximum RMS value that the ballast can draw.This is generated te

11、xt for figtxt.SC2.2 The input and output supply conditions for each of the tests performed, including the waveform, areto be recorded. Where practical, the same sample shall be used for all tests.SC2.3 If, during any test, there are indicators of a possible fault condition (i.e.: buzzing, arcing,ove

12、rheating, smoke, smell, etc.) then that test method shall be repeated as part of the fault condition testapplicable to the ballast.SC3 MarkingsSC3.1 Ballasts that have been evaluated as dimmable in accordance with SC2 are permitted to bemarked as such on the label, instructions or both. Where evalua

13、ted only with specific dimmers, the ballastshall be clearly identified as suitable only for use with these specific dimmers, in the same location as thedimmable marking.Figure SC1Phase-cut type dimmer output waveform(See Clause SC2.1.c.2)STANDARD NUMBER: UL 935 -2-UL COPYRIGHTED MATERIAL NOT AUTHORI

14、ZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULRATIONALE FOR DECISION:This CRD provides evaluation and testing requirements when ballasts are marked or otherwise indicatedby the manufacturer to be dimmable using solid-state dimming controls electrically wired in series with th

15、emains supply.When solid-state dimming controls are used to regulate the applied voltage to ballasts, different inputvoltage waveforms (non-sinusoidal 60 Hz) may influence the outcome of certain tests required by thisstandard. Specifically, these waveforms may influence heating of components integra

16、l to the ballast. Toaddress this concern, clause SC2 provides specific criteria for the supply sources used during both normaland abnormal temperature testing.This CRD substantially follows the requirements for self-ballasted lamps - UL 1993, 3rd Edition, clause8.12 (tests of dimmer circuits).Copyri

17、ght 2012 Underwriters Laboratories Inc.UL, in performing its functions in accordance with its objectives, does not guarantee or warrant thecorrectness of Certification Requirement Decisions it may issue or that they will be recognized or adoptedby anyone. Certification Requirement Decisions are the

18、opinion of Underwriters Laboratories Inc. inpractically applying the requirements of the standard. They do not represent formal interpretations of thestandard under American National Standards Institute (ANSI) processes. UL shall not be responsible toanyone for the use of or reliance upon Certificat

19、ion Requirement Decisions by anyone. UL shall not incurany obligation or liability for damages, including consequential damages, arising out of or in connectionwith the use or reliance upon Certification Requirement Decisions. The electronic version of theCertification Requirement Decision is the cu

20、rrent version and previously printed copies may be outdated.This document is published as a service to ULs certification customersSTANDARD NUMBER: UL 935 -3-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSTANDARD NUMBER: UL 935 -4-No Text on This Page