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): DXOQStandard Number: UL 1660Standard Title: Standard for Liquid-Tight Flexible Nonmetallic ConduitEdition Date: July 2, 2014Edition Number: 5Section / Paragraph Reference: 5.10.1, 5.10.4, 6.1.3 and Ta
3、ble 9Subject: Increase of the Wet Limitation for LFNC above 60C*This Certification Requirement Decision (CRD) supersedes prior CRD issued May 2,2018.DECISION:5.10.1 Specimens of the jacket of Type LFNC-A or Type LFNC-C conduit and specimens of the flexibleintegral lining or jacket of Type LFNC-B con
4、duit shall not absorb any more than 3.9 milligrams mass ofwater per square centimeter (25.0 milligrams mass of water per square inch) of immersed surface duringimmersion in tap water for 168 h at a temperature of 70.0 1.0C (158.0 1.8F) for insulation having atemperature rating of 60C (140F), at 82.0
5、 1.0C (179.6 1.8F) for insulation having a temperaturerating of 75C (167F) and at 94.0 1.0C (201.2 1.8F) for insulation having a temperature rating of90C (194F).A PVC or other material known to be non-hygroscopic and intended to have a LFNC conduit temperaturerating of 60C (140F) need not be subject
6、ed to this test.5.10.4 The water bath shall consist of a vitreous-enameled-steel or glass vessel containing tap water andshall be automatically controlled to maintain the water at 70.0 1.0C (158.0 1.8F) the specifiedtemperature. The vessel shall be provided with a close-fitting sheet-metal cover pla
7、te of brass or othernonferrous metal.6.1.3 The outside surface of conduit shall be marked with each of the following:a) Liquid-tight flexible nonmetallic conduit Type _ or LFNC-_ (use A, B,orC for thetype of LFNC conduit used). The means of reinforcement (fibrous or rigid) need not be markedb) The t
8、rade size and metric designator of the conduit, for example, 1/2 (16).c) The manufacturers name, trade name, or trademark or other descriptive marking thatidentifies the organization responsible for the conduit.d) 80C dry, 90C dry,or105C dry may be marked on conduit whose separate jacket orintegral
9、lining and jacket complies with the 113C (for the 80C rating), 121C (for the 90Crating), or 136C (for the 105C rating) oven aging requirements in Table 9. Conduit thatcomplies with one of these oven aging requirements but is not marked shall be acceptable foronly 60C dry use. Conduit may be marked 6
10、0C dry, but this use is understood without themarking.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULe) 70C oil res or 70C oil resistant may be marked on 80C or 105C dry use conduitwhose separate jacket or integral lining or jacket complies w
11、ith the 70C oil requirements inTable 9. Conduit, which complies and is not marked shall be acceptable for 60C oil resistantuse only. 60C dry use conduit shall not be so marked.f) SR, Sun Res,orSunlight Resistant may be marked on conduit whose separate jacket orintegral lining or jacket complies with
12、 the weather resistance test requirements in Clauses5.12.1 and 5.12.2. Conduit that complies but is not marked shall not be acceptable for usewhere exposed to direct rays of the sun.In the United States, Outdoor may be additionally marked.g) 75C wet or 90C wet may be marked on 80C or 105C dry use co
13、nduit whose separatejacket or integral lining or jacket complies with the 75C or 90C wet requirements in Table 9.Conduit, which complies and is not marked shall be acceptable for 60C wet use only. 60C dryuse conduit shall not be so marked. Conduit may be marked 60C wet, although this isunderstood wi
14、thout the marking.h) Conduit may be marked 60C oil res or 60C oil resistant, although this is understoodwithout the marking.i) Finished conduit that complies with the Direct-Burial Stiffness Test, in Clause 5.16, may besurface marked Direct Burial, Burial, Dir Burial,orDir Bur.j) Finished conduit th
15、at complies with the Flame Test in Cable Trays - FT4 per Clause 5.3 maybe marked FT4.Table 9Physical properties of jacket from Type LFNC-A or Type LFNC-C conduit and of flexible lining orjacket from Type LFNC-B conduit(See Clauses 5.13.1 and 6.1.3)Rating Condition of specimens attime of measurementM
16、inimum ultimateelongation 25 mm (1 in)Minimum tensile strengthAll specimens with or withoutmarkingsUnaged 100 percent 11.0 MN/m2(1600 lbf/in2)No jacket marking or 60Cdry, 60C wet, and 60C oilresistantAged in a full-draft, circulating-air oven for 168 h at 100.01.0C (212.0 1.8F)45 percent of the resu
17、lts ofthe unaged specimen85 percent of the results ofthe unaged specimenAged in IRM 902 oil for 168 hat 60.0 1.0C (140.0 1.8F)70 percent of the results ofthe unaged specimen70 percent of the results ofthe unaged specimen80C dry, 60C wet, and 60Coil resistantAged in a full-draft, circulating-air oven
18、 for 168 h at 113.01.0C (235.4 1.8F)45 percent of the results ofthe unaged specimen70 percent of the results ofthe unaged specimenAged in IRM 902 oil for 168 hat 60.0 1.0C (235.4 1.8F)70 percent of the results ofthe unaged specimen70 percent of the results ofthe unaged specimen80C dry, 60C wet, and
19、70Coil resistantAged in a full-draft, circulating-air oven for 168 h at 113.01.0C (235.4 1.8F)45 percent of the results ofthe unaged specimen70 percent of the results ofthe unaged specimenAged in IRM 902 oil for 168 hat 70.0 1.0C (158.4 1.8F)70 percent of the results ofthe unaged specimen70 percent
20、of the results ofthe unaged specimen90C dry, 60C wet, and 60Coil resistantAged in a full-draft, circulating-air oven for 168 h at 121.01.0C (249.8 1.8F)45 percent of the results ofthe unaged specimen70 percent of the results ofthe unaged specimenSTANDARD NUMBER: UL 1660 -2-UL COPYRIGHTED MATERIAL NO
21、T AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULTable 9 ContinuedRating Condition of specimens attime of measurementMinimum ultimateelongation 25 mm (1 in)Minimum tensile strengthAged in IRM 902 oil for 168 hat 60.0 1.0C (235.4 1.8F)70 percent of the results ofthe unag
22、ed specimen70 percent of the results ofthe unaged specimen105C dry, 60C wet, and60C oil resistantAged in a full-draft, circulating-air oven for 168 h at 136.01.0C (276.8 1.8F)45 percent of the results ofthe unaged specimen70 percent of the results ofthe unaged specimenAged in IRM 902 oil for 168 hat
23、 60.0 1.0C (140.0 1.8F)70 percent of the results ofthe unaged specimen70 percent of the results ofthe unaged specimen105C dry, 60C wet, and70C oil resistantAged in a full-draft, circulating-air oven for 168 h at 136.01.0C (276.8 1.8F)45 percent of the results ofthe unaged specimen unagedspecimen70 p
24、ercent of the results ofthe unaged specimenAged in IRM 902 oil for 168 hat 70.0 1.0C (158.0 1.8F)70 percent of the results ofthe unaged specimen70 percent of the results ofthe unaged specimen105C dry, 75C wet, and70C oil resistantAged in a full-draft, circulating-air oven for 168 h at 136.01.0C (276
25、.8 1.8F)45 percent of the results ofthe unaged specimen unagedspecimen70 percent of the results ofthe unaged specimenAged in IRM 902 oil for 168 hat 70.0 1.0C (158.0 1.8F)70 percent of the results ofthe unaged specimen70 percent of the results ofthe unaged specimen105C dry, 90C wet, and70C oil resis
26、tantAged in a full-draft, circulating-air oven for 168 h at 136.01.0C (276.8 1.8F)45 percent of the results ofthe unaged specimen unagedspecimen70 percent of the results ofthe unaged specimenAged in IRM 902 oil for 168 hat 70.0 1.0C (158.0 1.8F)70 percent of the results ofthe unaged specimen70 perce
27、nt of the results ofthe unaged specimenRATIONALE FOR DECISION:The Current UL standard for LFNC UL 1660 limits the usage of this product in wet locations to 60C. ThisCRD is intended to drive consistency between UL Standards UL 1660 and UL 1581, the Standard forElectrical Wires, Cables, and Flexible C
28、ords, which both contain water absorption tests. Both ULStandards have the same base wet temperature rating. This CRD serves to add both performance andmarking requirements for 75C and 90C wet temperature ratings to UL 1660.Copyright 2018 UL LLCUL LLC, in performing its functions in accordance with
29、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 UL LLC. in practically applying therequirements of the standard. They do not re
30、present formal interpretations of the 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
31、 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 1660 -3-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSTANDARD NUMBER: UL 1660 -4-No Text on This Page
