1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 870 Wireways, Auxiliary Gutters, and Associated FittingsUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT
2、AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Wireways, Auxiliary Gutters, and Associated Fittings, UL 870 Eighth Edition, Dated June 6, 2008 Summary of Topics Revision pages have been issued for UL 870 to update the Title Page to indicate
3、the latest approval date as an American National Standard and to include the following proposals that were balloted November 30, 2012: 1. Claried that electrical continuity needs to be determined between wireways and covers and ttings and covers. 2. Claried the wireway type rating marking location.
4、Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. Changes in requirements are marked with a vertical line in the margin and are followed by an effective date note indicating the date of publication or the date on wh
5、ich the changed requirement becomes effective. The revised requirements are substantially in accordance with Proposal(s) on this subject dated November 30, 2012. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means,
6、 electronic, mechanical photocopying, recording, or otherwise without prior permission of UL. 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
7、UL be liable for any special, incidental, consequential, indirect or similar damages, including 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 possi
8、bility of such damage. In no event shall ULs liability for any damage ever exceed the price 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, l
9、iability, damage, claim, or judgment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. The requirements in this Standard are now in effect, except for those paragraphs, sections,
10、 tables, gures, and/or other elements of the Standard having future effective dates as indicated in the note following the affected item. The prior text for requirements that have been revised and that have a future effective date are located after the Standard, and are preceded by a SUPERSEDED REQU
11、IREMENTS notice. FEBRUARY 27, 2013 UL 870 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 27, 2013 UL 870 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION
12、FROM UL JUNE 6, 2008 (Title Page Reprinted: February 27, 2013) 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 Seven
13、th Edition June, 1995 Eighth Edition June 6, 2008 This ANSI/UL Standard for Safety consists of the Eighth Edition, including revisions through February 27, 2013. The most recent designation of ANSI/UL 870 as an American National Standard (ANSI) occurred on February 27, 2013. ANSI approval for a stan
14、dard does not include the Cover Page, Transmittal Pages, Title Page, or effective date information. 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
15、 revisions on any part of the Standard may be submitted to UL at 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 Stand
16、ard should be altered in any way. All of ULs Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2013 UNDERWRITERS LABORATORIES INC. ANSI/UL 870-2013UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTIO
17、N OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 27, 2013 WIREWAYS, 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
18、 3 Units of Measurement .4 4 Undated References 4 CONSTRUCTION 5 General 4A 6 Design .4A 7 Conductor Size .5 8 Material 7 8.1 Metal wireways, auxiliary gutters, and associated ttings 7 8.2 Nonmetallic wireways, auxiliary gutters, and associated ttings .7 9 Thickness of Metal Metal Wireways, Auxiliar
19、y Gutters, and Associated Fittings .8 10 Flanges and Reinforcing Strips Metal Wireways, Auxiliary Gutters, and Associated Fittings .8 11 Openings in Enclosure Metal Wireways, Auxiliary Gutters, and Associated Fittings .9 11.1 Connections for wiring systems .9 11.2 Other openings 10 12 Covers Metal W
20、ireways, Auxiliary Gutters, and Associated Fittings 10 13 Hinges and Latches Metal Wireways, Auxiliary Gutters, and Associated Fittings 11 14 Expansion Joints and Telescoping Sections Metal Wireways, Auxiliary Gutters, and Associated Fittings 11 15 Supports .13 15.1 General .13 15.2 Metal wireways 1
21、3 15.3 Nonmetallic wireways .13 16 Protection Against Corrosion Metal Wireways, Auxiliary Gutters, and Associated Fittings . .13 17 Raintight Wireways .15 PERFORMANCE 18 General 16 19 Electrical Continuity Test Metal Wireways, Auxiliary Gutters, Covers, and Associated Fittings 16 20 Raintightness Te
22、st 16 20.1 General .16 20.2 Gaskets .19 21 Metallic Coating Thickness Test Metal Wireways, Auxiliary Gutters, and Associated Fittings .19 22 Support Test .20 23 Ultraviolet Light Exposure Nonmetallic Wireways, Auxiliary Gutters, and Associated Fittings .21 MARKING 24 General 21 25 Details .21 FEBRUA
23、RY 27, 2013 WIREWAYS, AUXILIARY GUTTERS, AND ASSOCIATED FITTINGS - UL 870 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
24、 accordance with the National Electrical Code, NFPA 70. 1.2 These requirements 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
25、denitions apply. 2.2 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. 2.3 AUXILIARY GUTTER A section of wireway used to supplement the wiring space at a distribution center, switchboard, or similar location in a
26、 wiring system. 2.4 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. 2.5 WIREWAY, NONMETALLIC A ame-retardant, nonmetal
27、lic 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 other units in parentheses, the rst s
28、tated value is the requirement. The second value may be only approximate. 4 Undated 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. JUNE 6, 2008 WIREWAYS, AUXIL
29、IARY GUTTERS, AND ASSOCIATED FITTINGS - UL 870 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONSTRUCTION 5 General 5.1 Construction requirements identied for wireways, auxiliary gutters and associated ttings apply to both nonmetallic and
30、 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 a well-equipped factory. 5.3 A wireway
31、 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. 5.5 Nonmetallic wireways, auxiliary g
32、utters 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, shall comply with the applicable require
33、ments 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 assembly and provide electrical conductivity c
34、omplying with the requirements for the Electrical Continuity Test Metal Wireways, Auxiliary Gutters, Covers, and Associated Fittings, Section 19. 6.1 revised February 27, 2013 6.2 A wireway shall be formed and assembled so that it will have the strength and rigidity necessary to resist the abuses to
35、 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 interior of the wireway shall be free from burrs an
36、d sharp corners or edges that may abrade the insulation on conductors or otherwise damage wiring. Screws and bolts, however used, shall not project into the wireway unless sharp ends and threaded sections are covered or otherwise prevented from coming in contact with wires. Exception: A threaded sec
37、tion 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. FEBRUARY 27, 2013 WIREWAYS, AUXILIARY GUTTERS, AND ASSOCIATED FITTINGS - UL 870 4AUL COPYRIGHTED MATERIAL
38、NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 6.4 A atwise elbow or 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 diago
39、nal wall see Figure 6.1 to permit a larger bending radius for installed conductors. Sweep ttings may also be used in wireways of square cross section. This is generated text for gtxt. 6.5 In a atwise sweep tting for a wireway of rectangular cross section, dimension A plus dimension C (the length of
40、leg cut off by the diagonal wall) shall be equal to or exceed dimension B. See Figure 6.1. 6.6 For metal wireways, metal straps not less than 1/2-in (12.7-mm) wide and of the same thickness as the wireway, or metal rods not less than 1/4 inch (6.4 mm) in diameter may be provided at intervals across
41、the width of the wireway to serve as wire-retaining means. Figure 6.1 Flatwise sweep elbow FEBRUARY 27, 2013 WIREWAYS, AUXILIARY GUTTERS, AND ASSOCIATED FITTINGS - UL 870 4BUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 7 Conductor Size 7.1
42、 The maximum conductor size for which a wireway is constructed is to be based on the bending space for conductors that enter or leave the wireway through connections in the sides or bottom in accordance with Table 7.1. FEBRUARY 27, 2013 WIREWAYS, AUXILIARY GUTTERS, AND ASSOCIATED FITTINGS - UL 870 5
43、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 27, 2013 WIREWAYS, AUXILIARY GUTTERS, AND ASSOCIATED FITTINGS - UL 870 6 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PER
44、MISSION FROM UL 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 (42.4) 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
45、) 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 at a point where there is no tting or fastening. 8 Material 8.1 Metal wireways, auxiliary gut
46、ters, 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. 8.1.2 In an auxiliary gutter, the use of insulating material to replace a portion of one wal
47、l 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 and rigidity equivalent to that of the auxiliary gutter without the substitution. 8.2 Nonmetall
48、ic wireways, auxiliary 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 replac
49、e a portion of one wall 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. JUNE 6, 2008 WIREWAYS, AUXILIARY GUTTERS, AND ASSOCIATED FITTINGS - UL 870 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DI
