1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUL LLC CERTIFICATION REQUIREMENT DECISIONThis Certification Requirement Decision is prepared by UL LLC. It is normative for the applicable ULProduct Certification Program(s); however, it is curre
2、ntly not part of the UL Standard(s) referencedbelow.Product Category (CCN): PWVXStandard Number: UL 719Standard Title: Standard for Nonmetallic-Sheathed CablesEdition Date: September 8, 2015Edition Number: 13Section / Paragraph Reference: 4.7.2, 4.8.2.1, 5.2.1, 5.4.1, 5.15.2, 5.15.3, 6.1.5.1, Table6
3、 and Table 9Subject: Adding requirements to address composite outer jacket of nylon/PVC.DECISION:4.7 Overall thermoplastic jacket4.7.1 The assembled cable shall be enclosed completely by a snug-fitting overall jacket of PVC (NMCcable) or of PVC or other thermoplastic (NM cable). The jacket shall pro
4、vide the cable with resistance toabrasion and the required flexibility. If it is applicable for the use, a jacket of a material other than PVC isacceptable on Type NM cable insulated with PVC or other thermoplastic material. A connector pull-out testis to be part of the evaluation of a cable jackete
5、d with a material other than PVC. The test (a pull of 60lbf or 267 N or 27.2 kgf applied for 5 minutes, with no more than 1/8 inch or 3 mm movement of the cablein the connector) is to be conducted as outlined under the heading Connectors for Nonmetallic-SheathedCable in the Standard for Conduit, Tub
6、ing, and Cable Fittings, UL 514B.4.7.2 A composite thermoplastic jacket of nylon and PVC, may be provided on NM cable. The nylon is theouter most layer.4.8.2.1 If a composite thermoplastic jacket is employed, each material, when separated, must comply withthe physical properties values called out in
7、 section 5.2.5.2 Physical properties of PVC and other materials5.2.1 The physical properties of specimens of a PVC jacket prepared from finished cable shall comply withthe requirements in the Physical properties of NM Cable PVCajacket Table, and a specimen of thenylon from the nylon/PVC composite ja
8、cket shall comply with the requirements in the “Physical propertiesof NM Cable Nylon jacket Table 10 when tested in accordance with the Physical Properties Section inthe Standard for Wire and Cable Test Methods, UL 2556. See 4.4.3 for the long-term evaluation of ajacket material not specified in 4.7
9、.1 or not complying with the applicable short-term tests.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULTable 10Physical properties of NM Cable Nylon jacketCondition of specimens at time ofmeasurementMinimum ultimate elongation (1-inchor 25-m
10、m bench marks)Minimum tensile strengthUnaged 100 percent 3000 lbf/in2or(1 inch or 25 mm) 20.6 MPaAged for 7 days in a full-draft circulating-air oven at 1131.0C (235 1.8F)Die-cut specimens: Die-cut specimens:65 percent of the result with unagedspecimens65 percent of the result with unagedspecimensTa
11、ble 6Thicknesses of outer covering on jacketed cables(See 5.3.1, 6.1.7, 7.3.2, 7.3.3, and 7.3.4)Type ofcableConstructionof coveringMinimum acceptable averagethicknessMinimum acceptable thickness at any pointAt the groundingconductorElsewhere than at thegrounding conductorThermoplastic andsheathTherm
12、oplastic Thermoplastic andsheathThermoplastic ThermoplasticMils mm Mils mm Mils mm Mils mm Mils mmNMThermoplasticjacket with noprotectivesheath30 0.76 15 0.38 24 0.61 Thermoplasticjacket overprotectivesheath20 0.51 30 0.76 16 0.41 24 0.61NMCThermoplasticjacket over 2or 3, 14 10AWG circuitconductors3
13、0 0.76 15 0.38 24 0.61 NMCompositejacket of nylonand PVC withno protectivesheath30 milstotalconsistingof 3-5mils ofnylonand27-25mils ofPVC0.760.076-0.1270.684-0.634- - 15 0.38 24 0.61 - -5.4 Separability test of cable parts5.4.1 The circuit conductors, the insulation thereon, the grounding conductor
14、, and any insulation or othercovering on the grounding conductor shall be readily separable from one another and from the rest of thefinished Type NMC or Type NM cable without damage to the insulation, covering, or any other part of thecable.STANDARD NUMBER: UL 719 -2-UL COPYRIGHTED MATERIAL NOT AUT
15、HORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULThe nylon and PVC of a composite jacket shall be separable from each other without damage to eachother.5.15 Abrasion resistance test of jacket on flat cable5.15.1 The jacket on finished flat cable containing two or three 14 or
16、 12 AWG copper or 12 or 10 AWGaluminum insulated circuit conductors shall not wear through exposing the underlying protective sheath orconductor assembly in fewer than 70 complete cycles of abrasion against sharp steel edges. The test isto be conducted as described in 7.14.5.15.2 A composite jacket
17、of nylon and PVC shall not wear through both layers exposing the underlyingprotective sheath or conductor assembly in fewer than 70 complete cycles of abrasion against sharp steeledges.5.15.2 3 The jacket on one or more of the six specimens tested shall not be worn through in fewer than70 complete s
18、trokes.RATIONALE FOR DECISION:This proposal is intended to provide requirements of a composite type jacket with a nylon/PVCthermoplastic jacket, where the nylon is the outer most layer. Physical Property requirements for nylonwere taken from UL758, The Standard for Appliance Wiring Material.The requ
19、irements and tests proposed are considered appropriate for the evaluation of this construction inUL719.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
20、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 underAmerican National Standards Institute (ANSI) processes. UL LLC shall
21、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 consequential damages, arising out of or in connection withthe use or reliance upon Certification Requirement Decisions.
22、 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 719 -3-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSTANDARD NUMBER: UL 719 -4-No Text on This Page
