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): IEZR, IEZX, IEUZ, IEVV IEXT, IEXZ, IFAM, IFAOStandard Number: UL 1598Standard Title: Standard for LuminairesEdition Date: September 17, 2008Edition Number: 3
3、Section / Paragraph Reference: Revised clause 16.14.1, 16.14.1 (MEX) and revisedtable 4.2.1, 4.2.2 and 16.14.1 (MEX)Subject: Self-threading Screw Torque RequirementsDECISION:16.14.1 Self-threading or sheet metal screws may be used if threads are not stripped when the screw istightened with a torque
4、of 3.39 Nm (30 lbin) to the torque given in Table 16.14.1 and if the part or theassembly supported by the screw withstands for 1 min a force equal to four times the mass of the part orassembly, applied in a direction coincident with the axis of the screw.16.14.1 (MEX) Screws may be used if threads a
5、re not stripped when the screw is tightened with the torquegiven in Table 16.14.1 (MEX) and if the part or the assembly supported by the screw withstands for 1 mina force equal to four times the mass of the part or assembly, applied in a direction coincident with the axisof the screw.Note The follow
6、ing table only includes entries being revised. Table 4.2.1 is not shown in itsentirety.Table 4.2.1Summary of country-specific requirements(See Clauses 4.2.3 and 4.2.5)16 Mechanical testsTable 16.14.1 (MEX) Screw torqueNote The following table only includes entries being revised. Table 4.2.2 (MEX) is
7、 not shown inits entirety.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULTable 4.2.2 (MEX)Requirements applicable to Mexico(See Clause 4.2.4)16 Mechanical testsTable 16.14.1 (MEX) Screw torqueTable 16.14.1 (MEX)Screw torque(See Clause 16.14.1
8、 and 16.14.1 (MEX).)Nominal screw diameter, mm Torque, NmHeadless screws Other screws and nutsUp to and including 2.8 0.20 0.4Greater than 2.8, up to and including3.00.25 0.5Greater than 3.0, up to and including3.20.30 0.6Greater than 3.2, up to and including3.60.40 0.8Greater than 3.6, up to and in
9、cluding4.10.70 1.2Greater than 4.1, up to and including4.70.80 1.8Greater than 4.7, up to and including5.30.80 2.0Greater than 5.3, up to and including6.0 2.5Greater than 6.0 8.0RATIONALE FOR DECISION:It is not reasonable to use a single standard torque value for a test applied across a variety of s
10、crewdiameters. Screw size is known to have an impact on the stripping torque. The MEX version of thisrequirement already provides reasonable torque values based on screw diameter. Clauses 5.10.3 &5.10.3 (MEX) remain unchanged to recognize the 3.4 kg test threshold now applicable in the US &Canada. T
11、here has been no problem reported below this threshold.Present Table 16.14.1 (MEX) would now cover all areas, instead of exclusively Mexico, and be simplyre-named Table 16.14.1 and references to Table 16.14.1 (MEX) would be removed.Copyright 2014 Underwriters Laboratories Inc.UL, in performing its f
12、unctions 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 opinion of Underwriters Laboratories Inc. inpractically applyi
13、ng 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 Certification Requirement Decisions by anyone. UL shall not incurany obl
14、igation 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 current version and previously printed copies may be outdated.ST
15、ANDARD NUMBER: UL 1598 -2-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULThis document is published as a service to ULs certification customersSTANDARD NUMBER: UL 1598 -3-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSTANDARD NUMBER: UL 1598 -4-No Text on This Page
