1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 884 Underoor Raceways and Fittings STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AU
2、THORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Underoor Raceways and Fittings, UL 884 Thirteenth Edition, Dated May 20, 2016 Summary of Topics This New Edition of ANSI/UL 884 includes the following changes in requirements: Addition of Test Pro
3、gram for Epoxy Coatings Revision to Installation Instructions Other Editorial Revisions The requirements are substantially in accordance with Proposal(s) on this subject dated March 18, 2016. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmi
4、tted 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, either expressed or implied, including but not limited to, the implied warranties of merchantability or tness for
5、any purpose. In no event will 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
6、 has been advised of the possibility 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 an
7、d against any loss, expense, liability, 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. MAY 20, 2016 UL 884 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED
8、 FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MAY 20, 2016 UL 884 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MAY 20, 2016 1 UL 884 Standard for Underoor Raceways and Fittings First Edition
9、July, 1934 Second Edition February, 1943 Third Edition April, 1956 Fourth Edition July, 1962 Fifth Edition October, 1970 Sixth Edition September, 1976 Seventh Edition October, 1981 Eighth Edition December, 1987 Ninth Edition June, 1994 Tenth Edition November, 1998 Eleventh Edition November, 2005 Twe
10、lfth Edition October, 2011 Thirteenth Edition May 20, 2016 This ANSI/UL Standard for Safety consists of the Thirteenth Edition. The most recent designation of ANSI/UL 884 as an American National Standard (ANSI) occurred on May 20, 2016. ANSI approval for a standard does not include the Cover Page, T
11、ransmittal Pages and Title Page. Comments or proposals for 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 copyright
12、ed by UL. Neither a printed nor electronic copy of a Standard 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 2016 UNDERWRITERS LABORATORIES INC. ANSI/UL 884-2016UL C
13、OPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MAY 20, 2016 UNDERFLOOR RACEWAYS AND FITTINGS - UL 884 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTR
14、ODUCTION 1 Scope .4 2 Undated References 4 3 Units of Measurement .4 CONSTRUCTION 4 General System .4 5 Grounding Continuity 5 6 Protective Coatings .5 6.1 Preset inserts and ducts .5 6.2 Outlet boxes and ttings .6 7 Duct .6 8 Preset Inserts 8 9 Junction Boxes .8 10 Fittings 10 11 Duct Supports 12 P
15、ERFORMANCE 12 Torque Test 12 13 Loading Test .13 14 Grounding Continuity Test .13 15 Protective Coatings Tests 13 15.1 Zinc 13 15.2 Enamel .15 15.3 Epoxy .15 16 Rigidity of Cover Test .15 17 Pull Test .16 18 Duct Support Test 16 19 Flame Test .16 MARKINGS AND INSTRUCTIONS 20 Markings .19 20.1 System
16、 .19 20.2 Duct 20 21 Instructions 21 EXAMINATION OF FINISHED PRODUCT BY MANUFACTURER 22 General 21 MAY 20, 2016 UNDERFLOOR RACEWAYS AND FITTINGS - UL 884 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These require
17、ments cover metal underoor duct systems designed for use as raceways for the installation of wires and cables in accordance with the National Electrical Code (NEC), NFPA 70. 1.2 These requirements do not cover rigid or exible conduit surface raceways or other products of a similar nature that are co
18、vered by individual requirements separate from these requirements. 1.3 General compliance of underoor raceway systems in accordance with the construction and performance requirements in this standard shall be determined by a study of an actual installation of the system or a completely representativ
19、e sample installation. 2 Undated References 2.1 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. 3 Units of Measurement 3.1 Values stated without parentheses are the requiremen
20、t. Values in parentheses are explanatory or approximate information. CONSTRUCTION 4 General System 4.1 All boxes, couplings, elbows, bends, duct supports, and other parts of an underoor raceway system shall be for use with the duct that is provided to form the complete underoor raceway system. The c
21、onstruction of boxes and ttings shall block the entrance of fresh concrete wherever joints are made in any actual installation (either between sections of duct, or between duct and boxes or other ttings). 4.2 A component of an underoor raceway system shall comply with the requirements for the constr
22、uction, performance, and use of that component. 4.3 The materials used for underoor raceways and ttings shall be compatible with all other materials in the raceway and ttings system. 4.4 Fittings for use with an underoor raceway system include all devices and accessories, other than junction boxes a
23、nd the duct itself, that are designed to form a part of the complete system. 4.5 For convenience in these requirements, ttings are divided into three general groups: duct ttings, outlet ttings, both covered in Section 10, and duct supports which are covered in Section 11. MAY 20, 2016 UNDERFLOOR RAC
24、EWAYS AND FITTINGS - UL 884 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5 Grounding Continuity 5.1 A reliable path for electrical current shall be provided between all parts of a system of duct and ttings when the system is installed in
25、 the intended manner. 5.2 The resistance of the connection of a duct with a tting shall be tested in accordance with the Grounding Continuity Test, Section 14. 5.3 A sheet metal screw shall not be used for the connection of an equipment grounding conductor. 6 Protective Coatings 6.1 Preset inserts a
26、nd ducts 6.1.1 Each preset insert made of iron or steel and all surfaces of duct that are not specically excepted in 6.1.2 shall be protected against corrosion by one of the following coatings: a) A coating of zinc (applied by any method) that complies with the test requirements in 15.1; b) A metal
27、coating other than zinc but at least as protective as the coating of zinc that is mentioned in (a); c) A system of organic paint or enamel that evaluation shows to be at least as protective as the coating of zinc mentioned in (a); see 15.2. d) A system of epoxy coating, which upon evaluation demonst
28、rates the same level of protection as the coating of zinc mentioned in (a); see 15.3. 6.1.2 In the case of zinc-coated sheet-steel duct (zinc applied by any method), a zinc coating is not required at any cut edge or at spot welds. 6.1.3 The edges of holes for preset insets are bare if the holes are
29、cut after the duct is painted or enameled. Paint or enamel is to be added to the edges unless the inserts are made of a zinc-base alloy. 6.1.4 The zinc coating on the inside and outside of nished duct shall be of uniform quality throughout and shall have a smooth and even appearance. Visual inspecti
30、on shall determine whether duct complies with this requirement. MAY 20, 2016 UNDERFLOOR RACEWAYS AND FITTINGS - UL 884 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 6.2 Outlet boxes and ttings 6.2.1 A junction box or duct tting, if made o
31、f iron or steel, shall be protected against corrosion by enameling, galvanizing, cementation, plating, or other equivalent means. If constructed of aluminum, it shall have a protective coating of asphalt, varnish, or enamel. 6.2.2 An outlet tting, if made of iron or steel, shall be protected against
32、 corrosion by means of a zinc coating specied in 6.1.1(a) or an equivalently protective coating of another metal. 6.2.3 At any time up to one year from the time of manufacture, an enamel coating on a junction box or tting shall comply with the requirements in 15.2. 6.2.4 At any time up to one year f
33、rom the time of manufacture, an epoxy coating on a junction box or tting shall comply with the requirements in 15.3. 7 Duct 7.1 Duct shall be made of sheet steel. Both inside and outside surfaces of each length of duct shall be cleaned of all scale and rust. The cleaning process shall leave the surf
34、ace of the duct in a condition that results in the protective coating adhering rmly and having a smooth surface. 7.2 The partitions between cells of a multicellular duct shall not have any openings through which wires or cables are likely to be passed from one cell to another in normal use. 7.3 Afte
35、r cleaning and before the protective coating is applied, the interior surface of each length of duct shall be examined to determine the absence or presence of scale. 7.4 Ordinarily, scale can be identied as a sharply dened edge or a rough surface extending for some distance along the duct, causing a
36、 slight but noticeable decrease in the internal dimensions. At the ends of the duct, scale may be identied by scraping the surface of the duct and thus removing the hard, brittle lm of the scale. 7.5 Welded seams shall be made so that each length of duct has strength for the conditions of use. 7.6 D
37、uct shall be of dimensions applicable to the size and quantity of wires to be installed in the raceway. Upper corners shall be rounded to a radius (outside) of not less than 3/16 inch (5 mm), except that ush duct need not have its upper corners rounded. See 21.2. 7.7 Duct shall provide a smooth wire
38、way for pulling in wires and cables and shall not have any burrs, ns, or other projections that can damage wiring. 7.8 The thickness of single-celled and multicellular sheet-steel duct and of the sheet-steel partitions between the cells of multicellular duct shall not be less than indicated in Table
39、 7.1. MAY 20, 2016 UNDERFLOOR RACEWAYS AND FITTINGS - UL 884 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Table 7.1 Minimum acceptable thickness of sheet-steel duct and partitions Internal measurements of single-celled duct or individual
40、 cells in multicellular duct Measurement made on duct partition after its fabrication from uncoated sheet steel but before addition of corrosion protection according to 15.1 Measurement made on duct or partition after its fabrication from zinc- coated a sheet steel but before any other coating is ap
41、plied Row Depth Cross- sectional area Width Thickness of covering over duct inch (mm) inch (mm) A Not greater than 4 inches (102 mm) Not greater than 8 inches 2 (51.6 cm) 2 Not greater than 4 inches (102 mm) At least 1-1/2 inches (38 mm) 0.042 b,c (1.07) b,c 0.045 b,d (1.14) b,d B Any duct that is c
42、onstructed in accordance with 12.2 and Section 13 Not greater than 8 inches (203 mm) At least 1 inch (25.4 mm) of concrete 0.042 b,c (1.07) b,c 0.045 b,d (1.14) b,d C Any duct that is other than indicated in row B and whose depth, cross-sectional area, width, and/or thickness of covering is other th
43、an as indicated in row A 0.067 (1.70) 0.070 (1.78) a Zinc applied by any method galvanizing, electroplating, or cementation. b See 20.2.3 20.2.5. c Partitions between cells are to be 0.067 inch (1.70 mm) thick. d Partitions between cells are to be 0.070 inch (1.78 mm) thick. 7.9 The means by which p
44、artitions between cells in multicellular duct are attached to the duct shall comply with both of the following: a) The means of attachment shall be smooth and without any projections that can damage wiring. b) The means of attachment shall remain secure and preclude any damage to the duct or partiti
45、on during the application of torque as described in Section 12, Torque Test. Exception: Permanent distortion is acceptable in duct that is constructed in accordance with 12.2. 7.10 Duct with covers intended to be installed with their upper surfaces ush with nished concrete shall be tested to determi
46、ne that the covers provide mechanical strength and rigidity for the intended use. These covers shall be tested as described in the Rigidity of Cover Test, Section 16. MAY 20, 2016 UNDERFLOOR RACEWAYS AND FITTINGS - UL 884 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTI
47、ON WITHOUT PERMISSION FROM UL 8 Preset Inserts 8.1 Each insert shall be made of metal and shall not be less than 0.067 inch (1.70 mm) thick if constructed of uncoated sheet steel 0.070 inch (1.78 mm) if zinc-coated or shall be formed from the metal of the duct. If a separate insert is attached to th
48、e duct, the joint shall be mechanically strong and shall block the entry of fresh concrete. An insert shall be capable of withstanding the Pull Test, Section 17. 8.2 Each insert shall provide a continuous metal passage from the duct or raceway to the underside of the oor covering and shall be constr
49、ucted to provide a smooth wire-pulling radius without any obstruction(s) within the duct or the outlet. 8.3 Visual inspection is to be made to determine whether an insert complies with the requirements in 8.2. 8.4 Each insert shall be capable of accommodating ttings designed for use with the raceway system in a manner that establishes and maintains continuity of the metal grounding connection between the tting and the duct. 8.5 If compliance of an insert with the req
