ANSI UL 870-2016 UL Standard for Safety Wireways Auxiliary Gutters and Associated Fittings (Ninth Edition).pdf

1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 870 Wireways, Auxiliary Gutters, and Associated Fittings STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYR

2、IGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Wireways, Auxiliary Gutters, and Associated Fittings, UL 870 Ninth Edition, Dated March 3, 2016 Summary of Topics The ninth edition has been issued for UL 870 to update the T

3、itle Page to indicate the latest approval date as an American National Standard and to include the following proposal that was balloted January 22, 2016: 1. Protection from Sharp Edges. The new and revised requirements are substantially in accordance with Proposal(s) on this subject dated January 22

4、, 2016. 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 UL. UL provides this Standard as is without warranty of any kind

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8、electronic Standard on the purchasers computer system. MARCH 3, 2016 UL 870 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MARCH 3, 2016 UL 870 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DI

9、STRIBUTION WITHOUT PERMISSION FROM UL MARCH 3, 2016 1 UL 870 Standard for Wireways, Auxiliary Gutters, and Associated Fittings First Edition October, 1943 Second Edition July, 1968 Third Edition May, 1973 Fourth Edition August, 1977 Fifth Edition June, 1985 Six Edition January, 1991 Seventh Edition

10、June, 1995 Eighth Edition June, 2008 Ninth Edition March 3, 2016 This ANSI/UL Standard for Safety consists of the Ninth Edition. The most recent designation of ANSI/UL 870 as an American National Standard (ANSI) occurred on March 3, 2016. ANSI approval for a standard does not include the Cover Page,

11、 Transmittal Pages and Title Page. The Department of Defense (DoD) has adopted UL 870 on April 14, 1987. The publication of revised pages or a new edition of this Standard will not invalidate the DoD adoption. Comments or proposals for revisions on any part of the Standard may be submitted to UL at

12、any time. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. 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 Standards and all co

13、pyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2016 UNDERWRITERS LABORATORIES INC. ANSI/UL 870-2016UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MARCH 3, 2016 WIREWA

14、YS, AUXILIARY GUTTERS, AND ASSOCIATED FITTINGS - UL 870 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 Glossary .4 3 Units of Measurement .4 4 Undated References 5 CONSTRUCTION 5 Gene

15、ral 5 6 Design .5 7 Conductor Size .7 8 Material 7 8.1 Metal wireways, auxiliary gutters, and associated ttings 7 8.2 Nonmetallic wireways, auxiliary gutters, and associated ttings .8 9 Thickness of Metal Metal Wireways, Auxiliary Gutters, and Associated Fittings .8 10 Flanges and Reinforcing Strips

16、 Metal Wireways, Auxiliary Gutters, and Associated Fittings .8 11 Openings in Enclosure Metal Wireways, Auxiliary Gutters, and Associated Fittings 10 11.1 Connections for wiring systems 10 11.2 Other openings 10 12 Covers Metal Wireways, Auxiliary Gutters, and Associated Fittings 10 13 Hinges and La

17、tches Metal Wireways, Auxiliary Gutters, and Associated Fittings 11 14 Expansion Joints and Telescoping Sections Metal Wireways, Auxiliary Gutters, and Associated Fittings 12 15 Supports .13 15.1 General .13 15.2 Metal wireways 14 15.3 Nonmetallic wireways .14 16 Protection Against Corrosion Metal W

18、ireways, Auxiliary Gutters, and Associated Fittings . .14 17 Raintight Wireways .16 PERFORMANCE 18 General 16 19 Electrical Continuity Test Metal Wireways, Auxiliary Gutters, Covers, and Associated Fittings .17 20 Raintightness Test 17 20.1 General .17 20.2 Gaskets .20 21 Metallic Coating Thickness

19、Test Metal Wireways, Auxiliary Gutters, and Associated Fittings .20 22 Support Test .21 23 Ultraviolet Light Exposure Nonmetallic Wireways, Auxiliary Gutters, and Associated Fittings .22 MARKING 24 General 22 25 Details .22 MARCH 3, 2016 WIREWAYS, AUXILIARY GUTTERS, AND ASSOCIATED FITTINGS - UL 870

20、3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover wireways, auxiliary gutters, and associated ttings to be employed in accordance with the National Electrical Code, NFPA 70. 1.2 These requirem

21、ents do not cover rigid or exible conduit, surface raceways, underoor raceways, nor other products of a similar nature that are covered by individual requirements. 2 Glossary 2.1 For the purpose of this standard the following denitions apply. 2.2 ACCESSIBLE EDGES Edges that are subject to contact by

22、 persons installing, using or maintaining the product. 2.3 ASSOCIATED FITTING A part that is used in the assembly of a complete wireway system, such as an elbow, tee, cross, end closer, or hanger. 2.4 AUXILIARY GUTTER A section of wireway used to supplement the wiring space at a distribution center,

23、 switchboard, or similar location in a wiring system. 2.5 WIREWAY, METAL A sheet-metal trough with a hinged or removable cover for housing and protecting electric wires and cables and in which conductors are laid in place after the wireway system has been installed as a complete system. 2.6 WIREWAY,

24、 NONMETALLIC A ame-retardant, nonmetallic trough with removable covers for housing and protecting electric wires and cables in which conductors are laid in place after the wireway has been installed as a complete system. 3 Units of Measurement 3.1 If a value for measurement is followed by a value in

25、 other units in parentheses, the rst stated value is the requirement. The second value may be only approximate. MARCH 3, 2016 WIREWAYS, AUXILIARY GUTTERS, AND ASSOCIATED FITTINGS - UL 870 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 4 Un

26、dated References 4.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. CONSTRUCTION 5 General 5.1 Construction requirements identied for wireways, auxiliary gutters and associat

27、ed ttings apply to both nonmetallic and metal devices, unless specically noted. 5.2 Wireways, auxiliary gutters, and associated ttings shall employ materials that are acceptable for the particular use, and shall be made and nished with the degree of uniformity and grade of workmanship practicable in

28、 a well-equipped factory. 5.3 A wireway system shall include all wireways and ttings required to make a complete installation in accordance with the National Electrical Code, ANSI/NFPA 70. 5.4 Unless otherwise noted, auxiliary gutters and ttings shall comply with all of the requirements for wireways

29、. 5.5 Nonmetallic wireways, auxiliary gutters and ttings shall additionally comply with construction requirements in the Standard for Nonmetallic Surface Raceways and Fittings, UL 5A. 5.6 Wireways, auxiliary gutters and ttings marked for use with an environmental rating, including enclosure types, s

30、hall comply with the applicable requirements specied in the Standard for Enclosures for Electrical Equipment, Environmental Considerations, UL 50E. 6 Design 6.1 A metal wireway shall be constructed, such that the interconnection of sections, covers, and ttings will provide a rigid mechanical assembl

31、y and provide electrical conductivity complying with the requirements for the Electrical Continuity Test Metal Wireways, Auxiliary Gutters, Covers, and Associated Fittings, Section 19. 6.2 A wireway shall be formed and assembled so that it will have the strength and rigidity necessary to resist the

32、abuses to which it is likely to be subjected, without resulting in a risk of re, electric shock, or injury to persons due to total or partial collapse with resulting damage to conductors, loosening or displacement of parts, or other serious defects. 6.3 The wireway and associated ttings shall be fre

33、e from burrs and sharp corners or edges that may abrade the insulation on conductors or otherwise damage wiring or constitute a risk of injury to persons. Screws and bolts, however used, shall not project into the wireway unless sharp ends and threaded sections are covered or otherwise prevented fro

34、m coming in contact with wires. Exception: A threaded section of a screw or bolt not having a sharp point need not be prevented from coming in contact with wires provided the screw or bolt does not project more than 1/32 in (0.8 mm) into the wireway. MARCH 3, 2016 WIREWAYS, AUXILIARY GUTTERS, AND AS

35、SOCIATED FITTINGS - UL 870 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 6.4 With reference to 6.3, a metal wireway and the associated metal ttings shall not have accessible edges that are sharp or pointed such that they constitute a risk

36、 of injury to persons in normal installation, maintenance and use. When considering sharp edges and points, all stages of the installation process must be considered. Exception No. 1: This requirement does not apply to accessible edges protected by guards or the use of handles to minimize access to

37、sharp edges or points. Exception No. 2: This requirement does not apply to an accessible edge or portion of an accessible edge that is required to be sharp in order to perform a working function. Exception No. 3: If sharp edges are present, but it is possible to avoid the hazard through proper proce

38、dures, then signs, labels or the manufacturers instructions shall describe the procedure to avoid the hazard during installation, maintenance, and use. 6.5 When determining compliance with 6.4, the Standard for Tests for Sharpness of Edges on Equipment, UL 1439, shall be used. 6.6 A atwise elbow or

39、tee or a similar tting for a wireway having a rectangular cross section shall be of the sweep type; that is, such a tting for a right-angle bend shall have the internal corner replaced by a diagonal wall see Figure 6.1 to permit a larger bending radius for installed conductors. Sweep ttings may also

40、 be used in wireways of square cross section. This is generated text for gtxt. Figure 6.1 Flatwise sweep elbow MARCH 3, 2016 WIREWAYS, AUXILIARY GUTTERS, AND ASSOCIATED FITTINGS - UL 870 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 6.7 I

41、n a atwise sweep tting for a wireway of rectangular cross section, dimension A plus dimension C (the length of leg cut off by the diagonal wall) shall be equal to or exceed dimension B. See Figure 6.1. 6.8 For metal wireways, metal straps not less than 1/2-in (12.7-mm) wide and of the same thickness

42、 as the wireway, or metal rods not less than 1/4 inch (6.4 mm) in diameter may be provided at intervals across the width of the wireway to serve as wire-retaining means. 7 Conductor Size 7.1 The maximum conductor size for which a wireway is constructed is to be based on the bending space for conduct

43、ors that enter or leave the wireway through connections in the sides or bottom in accordance with Table 7.1. Table 7.1 Conductor size based on bending space Smaller inside dimension of wireway a Maximum conductor size in (mm) AWG or MCM (mm 2 ) 2 (50.8) 3 (26.7) 2-1/2 (63.5) 2 (33.6) 3 (76.2) 1 (42.

44、4) 3-1/2 (88.9) 2/0 (67.4) 4 (102) 4/0 (107.2) 4-1/2 (114) 250 (127) 5 (127) 350 (177) 6 (152) 500 (253) 8 (203) 900 (456) 10 (254) 1250 (633) 12 (305) 2000 (1013) a A minus tolerance of 1/8 in (3.2 mm) is allowed for manufacturing variations. The inside dimensions of the wireway are to be measured

45、at a point where there is no tting or fastening. 8 Material 8.1 Metal wireways, auxiliary gutters, and associated ttings 8.1.1 A wireway shall be of metal and shall be constructed to provide sufficient strength and rigidity so that the wireway will retain its shape and the covers will t as intended.

46、 8.1.2 In an auxiliary gutter, the use of insulating material to replace a portion of one wall of the auxiliary gutter where the wiring goes through meets the intent of the requirement in 8.1.1 when the insulating material and the assembly of the material to the auxiliary gutter supplies strength an

47、d rigidity equivalent to that of the auxiliary gutter without the substitution. MARCH 3, 2016 WIREWAYS, AUXILIARY GUTTERS, AND ASSOCIATED FITTINGS - UL 870 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 8.2 Nonmetallic wireways, auxiliary

48、gutters, and associated ttings 8.2.1 The material used for nonmetallic wireways, auxiliary gutters, and associated ttings shall comply with the Standard for Nonmetallic Surface Raceways and Fittings, UL 5A. 8.2.2 In an auxiliary gutter, the use of insulating material to replace a portion of one wall

49、 of the auxiliary gutter where the wiring goes through meets the intent of the requirement in 8.2.1 when the insulating material and the assembly of the material to the auxiliary gutter supplies strength and rigidity equivalent to that of the auxiliary gutter without the substitution. 9 Thickness of Metal Metal Wireways, Auxiliary Gutters, and Associated Fittings 9.1 A sheet-metal enclosure shall have a thickness not less than that specied in Table 9.1