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): ZCTTStandard Number: UL 2157Standard Title: Standard for Electric Clothes Washing Machines and ExtractorsEdition Date: November 2, 2015Edition Number: 3Section / Paragraph Reference: Table 2Subject: C
3、lass F Insulation System limits for a motor having a frame diameter ofmore than 178 mmDECISION:Table 2 - Maximum acceptable temperature rises(See Clauses 9.1.1, 9.1.3, 9.1.5, 9.1.6 and 9.1.7.)Location C15 Class F insulation systems on coil windings of an ac motor having a frame diameter ofmore than
4、178 mm, of a dc motor, and of a universal motor in 178 mm or less, notincluding a universal motor, in an open motor by the thermocouple or resistance methodda) an open motor1) thermocouple method 1102) resistance method 120b) a totally enclosed motor1) thermocouple method 1152) resistance method 125
5、15A Class F insulation systems on coil windings of an ac motor having a frame diameter of178 mm or less, not including a universal motor inda) an open motor; thermocouple or resistance method 120b) a totally enclosed motor; thermocouple or resistance method 125RATIONALE FOR DECISION:This Certificati
6、on Requirement Decision is intended to document the Class F insulation systemrequirements for motors having a frame diameter more than 178 mm.Additionally, a 125 C limit for totally enclosed motors having a frame diameter 178 mm or less is alsobeing documented.These Class F insulation system require
7、ments align with other motor-operated appliance UL safetystandards (e.g. UL 73, UL 778, and UL 1017).Copyright 2016 UL LLCUL LLC, in performing its functions in accordance with its objectives, does not guarantee or warrant thecorrectness of Certification Requirement Decisions it may issue or that th
8、ey 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 the standard underAmerican National Standards Institute (ANSI) processes. UL LLC shall no
9、t be responsible to anyone forUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULthe use of or reliance upon Certification Requirement Decisions by anyone. UL LLC shall not incur anyobligation or liability for damages, including consequential dam
10、ages, arising out 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 2157 -2-
