1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUNDERWRITERS LABORATORIES INC. CERTIFICATION REQUIREMENT DECISIONThis Certification Requirement Decision is prepared by UL LLC. It is normative for the applicable ULProduct Certification Program(
2、s); however, it is currently not part of the UL Standard(s) referencedbelow.Product Category (CCN): ZACT, ZAJS, YZHW, ZACZ, ZANE, ZAXHStandard Number: UL 705Standard Title: Standard for Power VentilatorsEdition Date: July 19, 2017Edition Number: 7Section / Paragraph Reference: 26.1, 34.1 and Table 3
3、4.1Subject: Correction of Test temperatureDECISION:26 Dielectric Voltage-Withstand Test26.1 The equipment shall withstand without breakdown the following:a) A potential, as specified below, applied between live parts of hazardous voltage circuits, anddead (grounded) metal parts, for a period of 1 mi
4、n. AC test potentials are 40 70 Hz and DCtest potentials represent the peak value of the AC test potentials. For the test, the unit may bein a heated or unheated condition.1) 1000 V ac or 1400 dc for units rated 250 V or less, and which include a motor ratedat 1/2 hp or less2) 1000 V ac plus twice r
5、ated voltage or 1400 V dc plus 2.8 times rated voltage forunits rated more than 250 V or which include a motor rated larger than 1/2 hp.3) One thousand volts, or 1000 volts plus twice the rated voltage, depending upon thevalue of the test potential applied to the ventilator as a whole, between the t
6、erminals ofa capacitor used for power-factor correction or for radio-interference elimination.26.1 A ventilator shall withstand for 1 minute without breakdown the application of a 60-hertz essentiallysinusoidal potential between live parts and dead metal parts, and between live parts of opposite pol
7、arityfor a test on a capacitor as specified in (c), with the ventilator at the maximum operating temperaturereached in normal use. The test potential shall be:a) One thousand volts for a ventilator employing a motor rated 1/2 horsepower (370 W output)or less and 250 volts or less. See 19.4.b) One th
8、ousand volts plus twice the rated voltage for a ventilator employing a motor ratedmore than 1/2 horsepower or more than 250 volts. See 19.4.34 Production Dielectric Voltage-Withstand Test34.1 Each ventilator shall withstand without electrical breakdown as a routine production-line test, theapplicati
9、on of a DC potential or an AC potential at a frequency within the range of 40 - 70 hertz:UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULTable 34.1Production-line test conditionsCondition A Condition BAppliance rating Potential, volts Time, se
10、conds Potential, volts Time, seconds250 volts or less with no motor ratedmore than 1/2 horsepower (370 W) 1000 60 1200 1More than 250 volts or with a motor ratedmore than 1/2 horsepower 1000 + 2Va60 1200 + 2.4Va1aMaximum marked voltage.Table 34.1Production-line test conditionsAppliance rating, V Con
11、dition A Condition BPotential, V Time, s Potential, V Time, sAC DC AC DC250 volts or less with nomotor rated more than 1/2horsepower (370 W)1 000 1 400 60 1200 1 700 1More than 250 volts or with amotor rated more than 1/2horsepower1000+2V 1400+2.8V 60 1200+2.4V 1700+3.4V 1V = maximum marked voltage.
12、RATIONALE FOR DECISION:The Dielectric Voltage Withstand Strength Test may be conducted with either an AC or DC test potential.When testing with a DC voltage, the test potential must be adjusted to obtain the peak voltage equivalentto the AC RMS test potential. This Certification Requirement Decision
13、 (CRD) is intended to includerequirements for a DC Dielectric test.This CRD documents the updated wording for the Dielectric Voltage-Withstand Test includingrequirements for direct voltage.Copyright 2017 UL LLCUL LLC, in performing its functions in accordance with its objectives, does not guarantee
14、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 UL LLC. in practically applying therequirements of the standard. They do not represent formal interpretations of t
15、he standard underAmerican National Standards Institute (ANSI) processes. UL LLC shall not be responsible to anyone forthe use of or reliance upon Certification Requirement Decisions by anyone. UL LLC shall not incur anyobligation or liability for damages, including consequential damages, arising out
16、 of or in connection withthe use or reliance upon Certification Requirement Decisions. The electronic version of the CertificationRequirement 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 705 -2-
