1、C22.2 No. 40-M1989(reaffirmed 2014)Cutout, Junction, and Pull BoxesLegal Notice for StandardsCanadian Standards Association (operating as “CSA Group”) develops standards through a consensus standards development process approved by the Standards Council of Canada. This process brings together volunt
2、eers representing varied viewpoints and interests to achieve consensus and develop a standard. Although CSA Group administers the process and establishes rules to promote fairness in achieving consensus, it does not independently test, evaluate, or verify the content of standards.Disclaimer and excl
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15、TERFORTHESOLEPURPOSEOFREVIEWINGITsSEARCHANDBROWSETHISDOCUMENTANDsPRINTTHISDOCUMENTIFITISIN0$ it consisted of 37 pages, each dated April 1989. Errata to Clause 4.8.1 and Table 2 are incorporated (and identified by a vertical line in the margin) in the attached replacement pages. GSA Standard C22.2 No
16、. 40-M1989 now consists of the following pages: 318, 2128, and 3137 dated April 1989; and 19, 20, 29, and 30 dated March 1992. These replacement pages are to be inserted into your copy of the Standard; the pages replaced should be kept for reference. the edge of the metal and only slightly longer th
17、an the width of the strip. The acceptability of formed hinges made of materials other than steel shall be determined by special investigation. 4.6.1.8 Hinges of the ear-type shall not be used where the spacing between them would be more than 650 mm, regardless of the thickness of the metal used. Not
18、e: This type of hinge consists of projections at the ends of opposite side or end walls and corresponding projections in flanges on the cover. Rivets or bolts serve as hinge pins to connect adjacent projections on wall and cover respectively. 4.6.1.9 Hinge pins without heads shall be upset or secure
19、d in place in an equivalent way. 4.6.2 Nonmetallic Enclosures Hinges shall be constructed to permit the opening and closing of the door (refer to Clause 4.5.2). Note: It is intended that the reliability of membrane-type hinges will be determined by this requirement. Hinges may form either an integra
20、l part or be considered an add-on. 4.7 Latches and Handles 4.7.1 Metal Enclosures 4.7.1.1 Doors shall be provided with at least one latch which shall have adequate strength and a positive action that prevents the doors from jarring open due to any vibration that they are likely to be subjected to du
21、ring normal use. 4.7.1.2 Latches shall be securely fastened in place by not fewer than two screws, rivets, spot welds, or some acceptable equivalent. 4.7.1.3 Single doors more than 1220 mm in length shall be provided with a minimum of two latches that secure the doors at points nearest the ends. Dou
22、bledoors that overlap shall be secured by a minimum of two latches, one located at each end. L1atches are only required on the door that closes last. Doubledoors that do not overlap shall have two latches per door, one located at each end of each door. 4.7.1.4 Where a door has all its edges flanged
23、and does not exceed 457 mm in width or length, a latch may consist of: (a) a button stamped in the side wall of the box that engages an indentation or closefitting hole in the cover flange; or (b) a button stamped on the cover flange that engages an indentation or closefitting hole in the side wall
24、of the box. 4.7.1.5 Except where latches of the pintumbler or selflocking types are used, knobs, door handles, or an approved equivalent shall be C22.2 No. 40M1989 March 1992 Page 19 (Replaces p. 19, April 1989) provided for the opening Of doors. 4.1.2 Nonmetallic Enclosures Latches shall provide a
25、positive fastening action. Note: Latches may form either an integral part or be considered an add-on. 4.8 Covers 4.8.1* Metal Enclosures Covers, unless hinged directly to the side wall of the box, shall be secured by no less than four fastenings, except that two screws, one at the centre of eac shor
26、t side, may be used to fasten a cover no larger than 32 900 mm , provided that no dimension of the cover is greater than 216 mm. *Effectjve Date-March 31, 1992 4.8.2 Nonmetallic Enclosures 4.8.2.1 Covers for junction or pull boxes shall be of the blank-type only. 4.8.2.2 Covers shall be a minimum of
27、 4.37 and an average of 4.76 mm thick. 4.8.2.3 Mating surfaces of a cover and box shall provide a close fit. A gasket, if required to provide a close fit, shall be provided with the cover but need not be cemented or otherwise secured in place on the cover. 4.8.2.4 Screws provided to attach covers sh
28、all be made of brass, bronze, or steel. If made of steel, they shall be protected against corrosion. Screws shall be not smaller than No. 6, have no more than 32 threads per 25.4 mm, and shall engage at least 2 full threads in the cover. 4.9 Knockouts and Twistouts 4.9.1 Metal Boxes 4.9.1.1 Where kn
29、ockouts are punched from the material of the box proper, they shall be cleancut and, after being planished, shall not protrude more than (approximately) 50% of the thickness of the metal at any point on their circumference. 4.9.1.2 Where multiple arrangements consisting of a single knockout combined
30、 with twistouts are used, each shall be held by ties at least 3.17 mm wide, and the ties shall be arranged to make it unlikely that any other than the desired opening will be made. This will ordinarily require one or more extra ties for the twistouts, and staggering of the ties. See Clause 6.4 of CS
31、A Standard C22.2 No. 0 for the test requirements for a single knockout surrounded by multiple twistouts. C22.2 No. 40M1989 March 1992 Page 20 (Replaces p. 20, April 1989) shown in Figure 2, with the dimensions shown in Table 10. Before the gauge is used, the knockout shall be removed and, when neces
32、sary, the remaining tab shall be filed or ground flush with the surface of the box, inside and outside the box, as well as at the edge surrounding the opening. An appropriate trade size gauge shall be used, offset from the centre of the knockout in a direction opposite to the area to be tested. When
33、 testing knockouts located adjacent to a box radius, a steel feeler gauge, 0.13 mm thick and 2.5 mm wide, shall be used to check the space between inner box surface and the flat surface of the gauge, as shown in Figure 3. The test gauge shall not be canted or tiltedto make the necessary contact with
34、 the surface of the box. The ability to insert the steel feeler between the box surface and the gauge surface confirms that the boxs corner radius encroaches on the required flat surface and that the box has failed the test. When testing knockouts or portions of knockouts located away from any radiu
35、s between two adjacent walls, the steel feeler gauge shall not be used. Note: The purpose of this test is to ensure that a locknut will be seated flush with the surface of the box. 6.3.2 strength of Knockouts A knockout shall remain in place when subjected to a force of 44 N applied at right angles
36、by means of a mandrel with a 6.4 mm diameter flat end. The mandrel shall be applied at the point most likely to cause movement of the knockout. 6.3.3 Knockouts (Pryouts, Including Breakouts) in Boxes of Nonmetallic Material 6.3.3.1 A knockout shall be removed easily by means of a screwdriver used as
37、 a chisel, without any sharp edges being left or any damage being caused to the box. The side edge of a screwdriver may be run once along the edge of the knockout opening to remove any fragile tabs remaining along the edge. 6.3.3.2 Boxes that are constructed of a material that is known to be affecte
38、d by low temperatures shall be conditioned for 5 h at a temperature of 20 2C in circulating air. Immediately after this conditioning, the test described in Clause 6.3.3.1 shall be repeated on a knockout. 6.4 Security of Doors Doors shall be opened and closed 25 times without evidence of cracking or
39、other indications of material breakdown. C22.2 No. 40M1989 March 1992 Page 29 (Replaces p. 29, April 1989) Table 1 Minimum Thickness for Cast Metal Enclosures (See Clause 4.1.2.1.) Method of Minimum thickness of plain walls, nun Area up to 15 480 mm2 Area over 15 480 nun2 fabrication Length up to 15
40、2 mm Length over 152 mm Diecast 1.58* 2.38 Other 3.17 3.17 *Area and length limitations may be complied with by subdividing larger areas by means of suitable reinforcing ribs. Table 2t Minimum Thickness of Sheet Metal (See Clause 4.1.2.2.) Maximum siz largest sur e of face Minimum mm thickness, Leng
41、th or width, mm Ajea, m Steel Stainless steel* Aluminum 610 0.232 1.34 1.06 1.84 1016 0.645 1.69 1.34 2.33 2286 1.626 2.35 1.69 3.03 Over 2286 Over 1.626 3.11 2.35 3.81 *Stainless sheet-steel shall comply with ASTM Standard A167. tEffective Date-March 31, 1992 C22.2 No. 40M1989 March 1992 Page 30 (R
42、eplaces p. 30, April 1989 General Instruction No. 1C22.2 No. 40-M1989April 1989Title: Cutout, Junction, and Pull BoxesPagination: 37 pages, each dated April 1989To register for e-mail notification about any updates to this publicationgo to shop.csa.caclick on CSA Update ServiceThe List ID that you w
43、ill need to register for updates to this publication is 2002373.If you require assistance, please e-mail techsupportcsagroup.org or call 416-747-2233.Visit CSA Groups policy on privacy at csagroup.org/legal to find out how we protect your personal information.Canadian Standards Association C22.2 No.
44、 40-M1989 Cutout, Junction, and Pull Boxes Wiring Products Forming Part of Canadian Electrical Code, Part II Safety Standards for Electrical Equipment ISSN 0317-5669 Published in April 1989 by Canadian Standards Association (Incorporated 1919) 178 Rexdale Boulevard Rexdale (Toronto), Ontario Canada
45、M9W 1R3 Technical Editor: Christopher Harding Managing Editor: Bernard Kelly Canadian Standards Association1989 All rights reserved. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior permission of the publisher. Contents Tech
46、nical Committee on Wiring Products 5 Subcommittee on C22.2 No. 40 7 Preface 8 Foreword 9 1. Scope 11 2. Definitions 11 3. General Requirements 12 4. Construction 13 4.1 Metal Enclosures 13 4.1.1 Material 13 4.1.2 Thickness 13 4.1.3 Reinforcement 13 4.1.4 Rigidity 13 4.1.5 Openings in Enclosures 13 4
47、.1.6 Seams 14 4.1.7 OnePiece Boxes 14 4.1.8 Fastenings 15 4.1.9 Barriers for Metal Boxes 15 4.1.10 Conduit Hubs 15 4.2 Nonmetallic Enclosures 16 4.2.1 General 16 4.2.2 Mounting Means 16 4.2.3 Screw Mountings 16 4.2.4 ConduitConnection Sockets 16 4.3 Special Purpose Enclosures 16 4.4 Clear Panels 16
48、4.4.1 Glass Panels 16 4.4.2 Nonglass Panels 17 4.5 Doors 17 4.5.1 Metal Enclosures 17 4.5.2 Nonmetallic Enclosures 17 4.6 Hinges 18 4.6.1 Metal Enclosures 18 4.6.2 Nonmetallic Enclosures 19 4.7 Latches and Handles 19 4.7.1 Metal Enclosures 19 4.7.2 Nonmetallic Enclosures 20 4.8 Covers 20 4.8.1 Metal Enclosures 20 4.8.2 Nonmetallic Enclosures 20 4.9 Knockouts and Twistouts 20 4.9.1 Metal Boxes 20 4.9.2 Metal and Nonmetallic Boxes 21 4.10 Protection Against Corrosion 21 4.11 Bonding 22 4.12 Plates 22 C22.2 No. 40Ml989 April 1989 Page 3 5. Marking 22 Dropping of Burning Particles 24
