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): All CCNs under UL 508Standard Number: UL 508Standard Title: Standard for Industrial Control EquipmentEdition Date: January 28, 1999Edition Number: 17Section
3、/ Paragraph Reference: 61C.6 (new), 61C.7 (new), Table 61C.3 (new)Subject: Ratings Over 277 Vac for Electronic BallastsDECISION:Table 61C.3Peak current requirements with pulse width less than or equal to 2.35 ms for endurance testSteady state current (A) Peak current (A), 347 Vac Pulse width 347 Vac
4、 (ms).See Note 2I2t(A2sec) 347 Vac. SeeNote 10.5 198 0.34 921 270 0.47 1732 354 0.70 2943 396 0.86 3695 450 1.15 4768 492 1.5 56910 508 1.67 60612 529 1.86 65815 550 2.05 71116 552 2.10 716NOTES1 - The values used to calculate I2t are the peak current shown and pulse duration of 2.35 ms (t).2 - Puls
5、e widths shown will provide adequate performance with electronic ballasts having pulse widths up to 2.35 ms, inaccordance with the Standard for Lamp Ballasts - High Frequency Fluorescent Lamp Ballasts, ANSI_ANSLG C82.11, or theStandard for Lamp Ballasts Low-Frequency Square Wave Electronic Ballasts
6、- for Metal Halide Lamps, ANSI_ANSLG C82.14.61C.6 For products rated in excess of 347 Vac, the controls shall be tested with the specific model ofelectronic ballast(s) they are intended to control. The manufacturers name and model number of theelectronic ballast(s) with which the control is intended
7、 to be used shall be marked either on the product orprovided with the control on the packaging or stuffer sheet.61C.7 The characteristics of the waveform (peak currents and pulse width) shall be recorded using anoscilloscope.RATIONALE FOR DECISION:Table 61C.3, Peak current requirements with pulse wi
8、dth less than or equal to 2.35 ms, is derived fromUL 916 Table 51.2. This document was recently revised and reissued to include voltage values as notedin the table above.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULThe noted additions to Ta
9、ble 61C.3 complement these changes to the values in UL 916 and will allowmanufacturers evaluating their products to UL 508 to take advantage of the ratings for electronic ballastsrated over 277 Vac.Copyright 2015 Underwriters Laboratories Inc.UL, in performing its functions in accordance with its ob
10、jectives, 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 opinion of Underwriters Laboratories Inc. inpractically applying the requirements of the standar
11、d. 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 Certification Requirement Decisions by anyone. UL shall not incurany obligation or liability for damages,
12、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 current version and previously printed copies may be outdated.This document is published as a service to ULs certification customersSTANDARD NUMBER: UL 508 -2-
