UL 763 CRD-2018 UL Standard for Safety Motor-Operated Commercial Food Preparing Machines - Section Paragraph Reference 16 1 3 63 4 8 Subject Intentionally Ungrounded Parts (Editio.pdf

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): IPSTStandard Number: UL 763Standard Title: Standard for Motor-Operated Commercial Food Preparing MachinesEdition Date: February 28, 2018Edition Number: 5Section / Paragraph Reference: 16.1.3, 63.4.8Su

3、bject: Intentionally Ungrounded PartsDECISION:16.1.3 If a provision for grounding is provided, it shall be in accordance with 16.1.4, and if the machine iscord connected shall comply with the requirements in 16.1.5. All exposed dead metal parts and all deadmetal parts within the enclosure that are e

4、xposed to contact during any user servicing operation, and arelikely to become energized, shall be reliably connected to the means for grounding.Exception: A dead-metal part within the enclosure where it is not exposed during user servicing need notbe grounded, provided the appliance is marked in ac

5、cordance with 63.4.8.63.4.8 When an appliance employs a dead metal part that is not grounded as provided in Exception to16.1.3, the appliance shall be permanently marked with the word WARNING and the following or theequivalent: Certain internal parts are intentionally not grounded and may present a

6、risk of electric shockonly during servicing. Service Personnel - Do not contact the following parts while the appliance isenergized: (list of ungrounded parts). The marking shall be located on the outside of the appliance wherereadily visible before any servicing operation, and at each approach to a

7、n ungrounded part where readilyvisible before or when the part becomes accessible.Exception: If all approaches to all ungrounded parts can be adequately covered by one marking, only onemarking, visible from the outside of the appliance and at the approach to the ungrounded parts, need beemployed.RAT

8、IONALE FOR DECISION:This Certification Requirement Decisions is intended to provide an exception to the grounding requirementto allow intentionally ungrounded internal dead-metal parts.These requirements are identical to the requirements in UL 197 Commercial Electric CookingAppliances, clauses 18.8

9、and 88.15.This Certification Requirement Decision is intended to reflect present practice in the application of theserequirements.Copyright 2018 UL LLCUL LLC, in performing its functions in accordance with its objectives, does not guarantee or warrant thecorrectness of Certification Requirement Deci

10、sions 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 the standard underUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR

11、 FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULAmerican 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

12、, including consequential damages, 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 763 -2-