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): DXOQStandard Number: UL 1660Standard Title: Standard for Liquid-Tight Flexible Nonmetallic ConduitEdition Date: July 2, 2014Edition Number: 5Section / Paragr
3、aph Reference: Tables 3, 4, 6 and 8Subject: Addition of inside and outside dimensions, Wall thickness of flexible liningor jacket, development of minimum deflection load and mandrel diameters for2-1/2, 3, 3-1/2 and 4 trade size Mandrels for Liquid-Tight Flexible NonmetallicConduitDECISION:Table 3Ins
4、ide and outside dimensions of Type LFNC-B conduit(See Clauses 4.3.2.1 and 4.3.2.2)Trade size(metricdesignator)Inside diameter,mm (in)Outside diameter,mm (in)Diameter DgofGO Gauge,mm (in)Diameter DnofNO-GO Gauge,mm (in)Minimum Maximum* Minimum Maximum*3/8 (12) 12.29 (0.484) 12.80 (0.504) 17.53 (0.690
5、) 18.03 (0.710) 12.27 (0.483) 12.83 (0.505)1/2 (16) 15.80 (0.622) 16.31 (0.642) 20.83 (0.820) 21.34 (0.840) 15.77 (0.621) 16.33 (0.643)3/4 (21) 20.83 (0.820) 21.34 (0.840) 26.16 (1.030) 26.67 (1.050) 20.80 (0.819) 21.36 (0.841)1 (27) 26.44 (1.041) 27.08 (1.066) 32.77 (1.290) 33.40 (1.315) 26.42 (1.0
6、40) 27.10 (1.067)1-1/4 (35) 35.05 (1.380) 35.81 (1.410) 41.40 (1.630) 42.16 (1.660) 35.03 (1.379) 35.84 (1.411)1-1/2 (41) 40.01 (1.575) 40.64 (1.600) 47.37 (1.865) 48.26 (1.900) 39.98 (1.574) 40.67 (1.601)2 (53) 51.31 (2.020) 51.94 (2.045) 59.44 (2.340) 60.33 (2.375) 51.28 (2.019) 51.97 (2.046)2-1/2
7、 4 (63 103)a a a a a a2-1/2 (63) 62.99 (2.480) 63.63 (2.555) 72.1 (2.840) 73.0 (2.875) 62.99 (2.480) 63.63 (2.555)3 (78) 77.98 (3.070) 78.74 (3.150) 87.9 (3.460 88.9 (3.500) 77.98 (3.070) 78.74 (3.150)3-1/2 (91) 88.90 (3.500) 89.92 (3.590) 100.6 (3.960) 101.6 (4.000) 88.90 (3.500) 89.92 (3.590)4 (10
8、3) 101.60 (4.000) 103.89 (4.090) 113.3 (4.460) 114.3 (4.500) 101.60 (4.000) 102.62 (4.050)aTo be developed.* Other values of maximum diameter are acceptable if the finished conduit is accommodated as intended by all acceptablefittings as determined by investigation. Tolerances of 0.01 mm (0.0005 in)
9、 apply to Dgand Dn.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULTable 4Wall thickness of flexible lining or jacket on Type LFNC-B conduit(See Clauses 4.3.2.3 and 6.1.1)Trade size(Metric designators)Minimum thickness at any point betweenconv
10、olutionsmm in3/8 (12) 2.41 0.0951/2 (16) 2.29 0.0903/4 (21) 2.41 0.0951 (27) 2.54 0.1001-1/4 (35) 2.67 0.1051-1/2 (41) 3.18 0.1252 (53) 3.18 0.1252-1/2 4 (63 103) a a2-1/2 (63) 3.18 0.1253 (78) 3.18 0.1253-1/2 (91) 3.18 0.1254 (103) 3.18 0.125aTo be developed.Table 6Minimum deflection load for any s
11、pecimen(See Clause 5.5.1)Trade size (metricdesignator)Type LFNC-A conduit, Type LFNC-B and LFNC-C conduit,N (lbf) N (lbf)3/8 (12) 1112 250 2447 5501/2 (16) 1112 250 1779 4003/4 (21) 1112 250 1334 3001 (27) 1112 250 1223 2751-1/4 (35) 1001 225 1001 2251-1/2 (41) 1001 225 1001 2252 (53) 1001 225 1001
12、2252-1/2 4 (63 103) a a a a2-1/2 (63) a a 1001 2253(78) a a 1001 2253-1/2(91) a a 792 1754 (103) a a 792 175aTo be developed.STANDARD NUMBER: UL 1660 -2-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULTable 8Mandrels(See Clauses 5.8.1, 5.11.1,
13、 and 5.12.1)Trade size (metric designator) Mandrel diameters,mm (in)3/8 (12) 102 4.01/2 (16) 165 6.53/4 (21) 216 8.51 (27) 330 13.01-1/4 (35) 406 16.01-1/2 (41) 457 18.02 (53) 564 22.22-1/2 4 (63 103) a a2-1/2 (63) 749.3 29.253 (78) 889.0 35.03-1/2 (91) 1016.0 40.04 (103) 1219.2 48.0aTo be developed
14、.RATIONALE FOR DECISION:The scope of UL 1660, the Standard for Safety for Liquid-Tight Flexible Nonmetallic Conduit, coversliquid-tight flexible nonmetallic conduit in the 3/8 - 4 (12 - 103) trade sizes of Type LFNC-A (Layered),Type LFNC-B (Integral), and Type LFNC-C (Corrugated) constructions.Accor
15、ding to the Standard, inside and outside dimensions, wall thickness of flexible lining or jacket,development of minimum deflection load and mandrel diameters for 2-1/2, 3, 3-1/2 and 4 trade sizeMandrels for Liquid-Tight Flexible Nonmetallic Conduit are identified as “to be developed”.UL has complete
16、d its work and developed requirements for 2-1/2, 3, 3-1/2 and 4 trade sizes for TypeLFNC-B conduits.Copyright 2014 Underwriters Laboratories Inc.UL, in performing its functions in accordance with its objectives, does not guarantee or warrant thecorrectness of Certification Requirement Decisions it m
17、ay issue or that they will be recognized or adoptedby anyone. Certification Requirement Decisions are the opinion of Underwriters Laboratories Inc. inpractically applying the requirements of the standard. They do not represent formal interpretations of thestandard under American National Standards I
18、nstitute (ANSI) processes. UL shall not be responsible toanyone for the use of or reliance upon Certification Requirement Decisions by anyone. UL shall not incurany obligation or liability for damages, including consequential damages, arising out of or in connectionwith the use or reliance upon Cert
19、ification Requirement Decisions. The electronic version of theCertification Requirement 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
