ANSI UL 493-2007 UL Standard for Safety Thermoplastic-Insulated Underground Feeder and Branch-Circuit Cables (Ninth Edition Reprint with Revisions Through and Including October 26 .pdf

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1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 493 Thermoplastic-Insulated Underground Feeder and Branch-Circuit Cables STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION

2、 FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Thermoplastic-Insulated Underground Feeder and Branch-Circuit Cables, UL 493 Ninth Edition, Dated June 1, 2007 Summary of Topics This revision to ANSI/UL 493

3、is being issued to reect the reaffirmation of the ANSI approval of the Standard. No technical changes have been made to the document. The revisions are substantially in accordance with Proposal(s) on this subject dated August 26, 2016. Text that has been changed in any manner or impacted by ULs elec

4、tronic publishing system is marked with a vertical line in the margin. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, electronic, mechanical photocopying, recording, or otherwise without prior permission of U

5、L. UL provides this Standard as is without warranty of any kind, either expressed or implied, including but not limited to, the implied warranties of merchantability or tness for any purpose. In no event will UL be liable for any special, incidental, consequential, indirect or similar damages, inclu

6、ding loss of prots, lost savings, loss of data, or any other damages arising out of the use of or the inability to use this Standard, even if UL or an authorized UL representative has been advised of the possibility of such damage. In no event shall ULs liability for any damage ever exceed the price

7、 paid for this Standard, regardless of the form of the claim. Users of the electronic versions of ULs Standards for Safety agree to defend, indemnify, and hold UL harmless from and against any loss, expense, liability, damage, claim, or judgment (including reasonable attorneys fees) resulting from a

8、ny error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. OCTOBER 26, 2016 UL 493 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 26, 2016 UL 493 tr2 No Text on This Page

9、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JUNE 1, 2007 (Title Page Reprinted: October 26, 2016) 1 UL 493 Standard for Thermoplastic-Insulated Underground Feeder and Branch- Circuit Cables First Edition February, 1957 Second Edition Aug

10、ust, 1968 Third Edition July, 1970 Fourth Edition July, 1975 Fifth Edition March, 1979 Sixth Edition February, 1983 Seventh Edition October, 1988 Eighth Edition December, 1995 Ninth Edition June 1, 2007 This ANSI/UL Standard for Safety consists of the Ninth Edition including revisions through Octobe

11、r 26, 2016. The most recent designation of ANSI/UL 493 as a Reaffirmed American National Standard (ANS) occurred on October 26, 2016. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, or Title Page. Comments or proposals for revisions on any part of the Standard may be

12、 submitted to UL at any time. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at https:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in any way. All of ULs

13、 Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2016 UNDERWRITERS LABORATORIES INC. ANSI/UL 493-2012 (R2016)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION

14、 FROM UL JUNE 1, 2007 UL 493 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .4 2 Units of Measurement .4 3 References 4 CONSTRUCTION 4 General 5 5 Conductors 5 6 Insulation 6 7 Assembly of

15、 Multiple-Conductor Cables .7 7.1 General 7 7.2 Circuit conductors 7 7.3 Grounding conductor 8 8 Outer Covering on Multiple-Conductor Cables .9 9 Assemblies That Include Single-Conductor Type UF Cables 14 10 Submersible Water-Pump Cable Constructions .14 PERFORMANCE 11 Separability 16 12 Continuity

16、16 13 Vertical Flame Test 17 14 Vertical-Tray Flame Test .17 15 Dielectric Voltage-Withstand Test 18 16 Tension and Elongation Test 19 17 Unwinding Test at Low Temperature .21 17.1 General .21 17.2 Preparation of specimens 21 17.3 Test equipment .21 17.4 Conduct of the test 22 17.5 Results 23 18 Con

17、ductor Pullout Test 23 19 Stability of Conguration Test .23 20 Impact Test .26 21 Crushing Resistance Test 28 22 Flow Test .29 23 Sunlight Resistance Test .30 MARKINGS 24 Details .30 JUNE 1, 2007 UL 493 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSI

18、ON FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover 14 4/0 AWG single-conductor PVC-insulated and -jacketed underground feeder and branch-circuit cable and at multiple-conductor PVC-jacketed underground feeder and branch-circuit cables containing two or three 14 6 AWG PVC-insulated circuit

19、conductors with or without a grounding conductor. These Type UF cables are intended for use in accordance with Article 340 and other applicable parts of the National Electrical Code, ANSI/NFPA-70 in wiring systems operating at a potential of 600 V or less. Submersible water-pump cables and multiple-

20、conductor assemblies to which a type-letter designation is not assigned are also covered in these requirements. 1.2 Multiple-conductor cable that is marked UF-B has a 75C (167F) jacket and conductors with insulation of 90C (194F) dry and at least 60C (140F) wet locations. Multiple-conductor cable th

21、at is marked UF has a 60C (140F) jacket and conductors with insulation for 60C (140F) dry and wet locations. Single-conductor cable is marked UF and has an integral insulation and jacket for 60C (140F) dry and wet locations. The ampacity of all cables covered in these requirements is that of 60C (14

22、0F) conductors. 1.3 These requirements do not cover insulation other than PVC, round cables containing two or more circuit conductors, at cables containing more than three circuit conductors, or multiple-conductor cables containing circuit conductors larger than 6 AWG. 2 Units of Measurement 2.1 In

23、addition to being stated in the inch/pound units that are customary in the USA, each of the requirements in this standard is also stated in units that make the requirement conveniently usable in countries employing the metric system (practical SI). Equivalent although not necessarily exactly identic

24、al results are to be expected from applying a requirement in USA or metric terms. Equipment calibrated in metric units is to be used when a requirement is applied in metric terms. 3 References 3.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be int

25、erpreted as referring to the latest edition of that code or standard. JUNE 1, 2007 UL 493 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONSTRUCTION 4 General 4.1 Underground feeder and branch-circuit cable shall be designated as Type UF

26、and shall comply in all respects with the applicable requirements for construction details and test performance. 4.2 Each of the materials used for the insulation, spacers, llers, jacket, and other non-metallic parts of a cable shall be resistant to fungi, moisture, and corrosion. In addition, each

27、of the materials used as insulation on the circuit conductors shall be acceptable for use in wet locations. 4.3 Polypropylene, PVC, and glass are known to be resistant to fungi and hence are acceptable in this respect without exposure tests. Tests to determine the degree of resistance to fungi are t

28、o be made as indicated in the American Society for Testing and Materials Standard Practice for Determining Resistance of Synthetic Polymeric Materials to Fungi ASTM G 21-96(2002) on materials not known to have the requisite property. Cotton, paper, jute, hemp, and the like are not acceptable whether

29、 treated or not. 5 Conductors 5.1 Only soft-annealed copper, copper-clad aluminum, or an acceptable aluminum alloy shall be used for the conductor or conductors in a cable. Soft-annealed copper shall comply with the Standard Specication for Soft or Annealed Copper Wire ASTM B 3-01. Solid aluminum co

30、nductors in size 12 8 AWG shall comply with the requirements for aluminum-wire stock (aluminum-alloy conductor material). All other aluminum conductors shall comply with the requirements for semi-annealed 8000 series aluminum conductors in Section 10 of UL 1581. Copper-clad aluminum conductors shall

31、 comply with the requirements in Section 11 of UL 1581. In a given cable, all conductors shall be of the same metal. 5.2 The conductor in single-conductor cable shall not be smaller than 14 AWG and shall not be larger than 4/0 AWG if of copper, and shall not be smaller than 12 AWG and shall not be l

32、arger than 4/0 AWG if of aluminum or copper-clad aluminum. A copper circuit conductor in a multiple-conductor cable shall not be smaller than 14 AWG and shall not be larger than 6 AWG. An aluminum or copper-clad aluminum circuit conductor in a multiple-conductor cable shall not be smaller than 12 AW

33、G and shall not be larger than 6 AWG. 5.3 The conductors in the 14 2 AWG single-conductor cables that comprise the pump cables mentioned in 10.1 shall be solid or stranded. The conductors in other 6 4/0 AWG single-conductor cable shall be stranded. Each 8 and 6 AWG circuit conductor in a multiple-co

34、nductor cable shall be stranded. Conductors shall comply with the requirements in the Standard for Thermoplastic-Insulated Wires and Cables, UL 83, except as modied in this Section. 5.4 A joint in a solid conductor or in one of the individual wires of a stranded conductor shall be made in a workmanl

35、ike manner and shall not increase the diameter of the solid conductor, the individual wire strand, or the overall stranded conductor. A joint shall not be made in a stranded conductor as a whole but shall be made by separately joining each individual wire. A joint shall be made only before coverings

36、, if any, are applied to an insulated conductor. The insulation applied to such joints shall be equivalent to that removed and shall have insulation-resistance and dielectric withstand-voltage characteristics complying with the Standard for Thermoplastic-Insulated Wires and Cables, UL 83. JUNE 1, 20

37、07 UL 493 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 6 Insulation 6.1 The circuit conductors in a nished multiple-conductor cable that is marked UF-B shall not have any surface marking of the ampacity or temperature rating and shall co

38、mply with one of the following: a) NYLON JACKET OVER INSULATION The insulation and the nylon jacket shall comply with the thickness and other applicable requirements for Types THWN-2, THWN, and THHN thermoplastic-insulated wires. The markings THWN-2 , THWN , THHN , THWN OR THHN , and -B shall not be

39、 used. b) NO NYLON JACKET The insulation shall comply with the thickness requirements for a Type TW thermoplastic-insulated wire using a PVC that complies with the requirements for both Type TW and THHN insulation (tensile strength and elongation complying with Table 50.155 of UL 1581 and deformatio

40、n test conducted at 121.0 1.0C or 249.8 1.8F with a decrease of not more than 50 percent in the thickness of the PVC insulation). The surface marking -B is optional on the insulation. 6.2 In all single- and multiple-conductor cables that are marked UF (without the suffix -B ), the insulation employe

41、d on the circuit conductor or conductors shall comply with the applicable requirements for Type TW thermoplastic-insulated wire (the surface marking TW is optional on the insulation). In any cable, a grounding conductor shall be bare or shall be fully insulated in compliance with 7.3.3 and with the

42、thickness and other requirements stated in this Section for the circuit conductors. 6.3 The insulation and jacket on single-conductor cable shall be integral with one another. The average and minimum-at-any-point thicknesses of the PVC determined on specimens of nished cable shall not be less than i

43、ndicated in Table 6.1. The method of preparing specimens, taking the measurements, and determining compliance shall be as specied in the Standard for Thermoplastic Insulated Wires and Cables, UL 83. 6.4 An insulation or jacket that is of material generically different from PVC (new material), or tha

44、t is of the PVC material specied in this Standard yet does not comply with the short-term tests for the PVC insulation in Specic Materials, Section 50 of UL 1581, or with the tests for the PVC jacket in Table 8.1 of this Standard, shall be of a material and in thicknesses and with the temperature ra

45、ting required for the specic underground feeder and branch-circuit cable type. The material shall be evaluated for the requested temperature rating as described in Long-Term Aging, Section 481 of UL 1581. Investigation of the electrical, mechanical, and physical characteristics of the cable using th

46、e material shall show the material to be comparable in performance to the PVC insulation or jacket material specied in this Standard. The investigation shall include tests such as crushing, impact, abrasion, deformation, heat shock, insulation resistance, and dielectric voltage-withstand. JUNE 1, 20

47、07 UL 493 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Table 6.1 Minimum acceptable thicknesses of integral insulation and jacket on single-conductor cable AWG size of conductor Minimum average of PVC Minimum at any point of PVC mils mm

48、mils mm 14 10 60 1.52 54 1.37 8 2 80 2.03 72 1.83 1 4/0 95 2.41 86 2.18 7 Assembly of Multiple-Conductor Cables 7.1 General 7.1.1 At least two but not more than three circuit conductors shall be used in a multiple-conductor cable. In a given cable, all of the circuit conductors shall be of the same

49、size. 7.1.2 A grounding conductor in a multiple-conductor cable is acceptable but not required. A grounding conductor shall not be part of a single-conductor cable. 7.2 Circuit conductors 7.2.1 In multiple-conductor cable, the circuit conductors shall be laid parallel. 7.2.2 The metal of the circuit conductors in nished multiple-conductor cable, with or without a grounding conductor, shall be at least as far apart as indicated