CSA C22 2 NO 0 22-2011 Evaluation methods for arc resistance ratings of enclosed electrical equipment (First Edition Update No 1 June 2012).pdf

1、C22.2 No. 0.22-11Evaluation methods for arc resistance ratings of enclosed electrical equipmentLegal Notice for StandardsCanadian Standards Association (CSA) standards are developed through a consensus standards development process approved by the Standards Council of Canada. This process brings tog

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17、t or make any copies of the contents hereof, and if you do make such copies, you are required to destroy them immediately. Use of this document constitutes your acceptance of the terms and conditions of this Legal Notice.Update No. 1C22.2 No. 0.22-11June 2012Note: For information about the Standards

18、 Update Service, go to shop.csa.ca or e-mail techsupportcsagroup.org.Title: Evaluation methods for arc resistance ratings of enclosed electrical equipment originally published August 2011The following revisions have been formally approved and are marked by the symbol delta () in the margin on the at

19、tached replacement pages:Revised Clause 6.1.5New NoneDeleted None Update your copy by inserting these revised pages.Keep the pages you remove for reference. 2012 CSA GroupEvaluation methods for arc resistance ratings of enclosed electrical equipmentJune 20126 Assessment6.1 Assessment of test results

20、6.1.1 GeneralThe criteria specified in Clauses 6.1.2 to 6.1.6 shall be used to assess the equipment for arcing. The equipment shall meet the criteria specified in Clauses 6.1.2 to 6.1.6 to qualify as arc-resistant equipment.6.1.2 Criterion No. 1 DeformationDoors, covers, wiring plugs, windows, and s

21、imilar parts shall not open. Bowing or other distortion may occur provided that no part comes out as far as the position of the indicators or walls (whichever is closer) on any side. An installation that is mounted closer to the wall than tested shall be considered to meet Criterion No. 1 provided t

22、hat the following conditions are met:(a) The permanent deformation shall be less than the intended distance to the wall.(b) Exhausting gases shall not be directed to the wall.6.1.3 Criterion No. 2 FragmentationNo fragmentation of the enclosure shall occur within the time specified for the test. Smal

23、l parts may be ejected from any assessed external surface above a height of 2 m (79 in) and from any external surface not under assessment. There shall be no restriction on the number of parts allowed to eject, but the mass of individual parts shall not exceed 60 g.6.1.4 Criterion No. 3 Burn-through

24、Arcing shall not cause holes in the accessible sides up to a height of 2 m (79 in) as follows:(a) Accessibility Type 1 Arcing shall not cause holes in the freely accessible front of the enclosure.(b) Accessibility Type 2 Arcing shall not cause holes in the freely accessible front, sides, and rear of

25、 the enclosure.Any opening in the switchgear caused by direct contact with an arc will also ignite an indicator mounted outside the switchgear at that same point. Because it is not possible to cover the entire area under assessment with indicators, any opening in the area under assessment that resul

26、ts from direct contact with an arc shall be considered cause for failure.6.1.5 Criterion No. 4 Indicators (see Clause 5.4)No indicators shall ignite as a result of escaping gases. Indicator ignition or holes as a result of glowing particles or indicators ignited as a result of the burning of paint,

27、labels, nameplates, or mimic bus are acceptable. High-speed movies or video may be used to evaluate the cause of indicator ignition.Surface discoloration or charring that does not result in glowing or flaming of the indicator cloth shall be allowed. Any indicator cloth with surface discoloration or

28、charring shall be replaced with new cloth prior to further testing.6.1.6 Criterion No. 5 GroundingAll the grounding connections shall remain effective.6.2 Test reportThe following information shall be included in the test report:(a) a description of the test unit with a drawing showing(i) the main d

29、imensions of the equipment;(ii) the method of anchoring the equipment to the floor or walls;(iii) any protective devices employed to limit fault current duration;(iv) the dimensions specified in Clause 5.1.1.6, where applicable; and19(Replaces p. 19, August 2011)C22.2 No. 0.22-11 2012 CSA GroupJune

30、2012(v) areas where devices such as relays, meters, and control devices might be mounted;Note: This information is given to identify the design in the manufacturers test report. It is not necessary to provide this construction information in a published test document for customer use.(b) the arrange

31、ment of the test connections of Clause 5.2.6.1 and the point of initiation of the arc;(c) the arrangement of indicators with respect to the accessibility type;(d) the following prospective calibration values:(i) the rms value of the ac component of the prospective current;(ii) the highest peak value

32、 of the prospective current;(iii) the test duration as specified by the laboratory;(iv) the actual test voltage; and(v) the frequency;(e) the following arcing current test values:(i) the highest peak current value;(ii) the duration of arc current; and(iii) the rms value of arcing current, including

33、the maximum, minimum, and ratio of maximum value of the ac current component to the minimum value (see Clause 5.2.3);(f) an oscillogram(s) showing currents and voltages; and(g) the assessment of the test results and of compliance with Clause 6.1.6.3 Marking6.3.1 NameplateThe following information sh

34、all be provided on a nameplate to identify the arc resistance rating of the equipment:(a) the accessibility type;(b) the internal arcing short-circuit current;(c) the arcing duration;(d) the type of protective device, where applicable; and(e) the rated maximum clearing time for the protective device

35、 specified in Item (d).When fuses or fast-acting protective devices have been employed to achieve the arc resistance rating, the term “DEVICE LIMITED” shall be entered on the nameplate under Item (c), and the specific device shall be indicated by part number under Item (d). The rated maximum clearin

36、g time for the protective device (maximum operating time for a fuse or the combined operating times for a sensor and switching device) shall be entered under Item (e).6.3.2 Doors and coversEquipment shall be marked:“CAUTION: To maintain arc-resistant rating, all doors and covers must be closed and p

37、roperly secured.”and”ATTENTION : Pour prserver les caractristiques nominales de rsistance larc, sassurer que les portes et les couvercles sont ferms et verrouills.”6.3.3 Exhaust system dischargeWhere the equipment includes an exhaust system, the location of the exhaust discharge shall be marked:“DAN

38、GER: Hot Gases”and”DANGER : Gaz chauds”.(Replaces p. 20, August 2011)20CSA Standards Update ServiceC22.2 No. 0.22-11August 2011Title:Evaluation methods for arc resistance ratings of enclosed electrical equipmentPagination:44 pages (viii preliminary and 36 text), each dated August 2011To register for

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40、 or call 416-747-2233.Visit CSAs policy on privacy at www.csagroup.org/legal to find out how we protect your personal information.Published in August 2011 by Canadian Standards AssociationA not-for-profit private sector organization5060 Spectrum Way, Suite 100, Mississauga, Ontario, Canada L4W 5N61-

41、800-463-6727 416-747-4044Visit our Online Store at www.ShopCSA.caC22.2 No. 0.22-11Evaluation methods for arc resistance ratings of enclosed electrical equipmentCSA Standard100%ISBN 978-1-55491-692-4 Canadian Standards Association 2011All rights reserved. No part of this publication may be reproduced

42、 in any form whatsoever without the prior permission of the publisher.To purchase CSA Standards and related publications, visit CSAs Online Store at www.ShopCSA.ca or call toll-free 1-800-463-6727 or 416-747-4044.The Canadian Standards Association (CSA) prints its publications on Rolland Enviro100,

43、which contains 100%recycled post-consumer fibre, is EcoLogo and Processed Chlorine Free certified, and was manufactured using biogas energy.August 2011 iiiContents Canadian Standards AssociationEvaluation methods for arc resistanceratings of enclosed electrical equipmentTechnical Committee on Indust

44、rial Products vSubcommittee on Requirements for Arc Resistance Ratings viPreface vii1Scope12 References 23 Definitions 34Ratings44.1 Accessibility type 44.2 Internal arcing short-circuit current 44.3 Arcing duration 45 Testing 45.1 Test preparation 45.1.1 Testing considerations for all equipment 45.

45、1.2 Testing considerations for metal-clad switchgear 65.1.3 Testing considerations for metal-enclosed equipment 75.1.4 Testing considerations for metal-enclosed, low-voltage equipment 85.1.5 Testing considerations for outdoor equipment 95.2 Test conditions 105.2.1 General 105.2.2 Voltage 105.2.3 Cur

46、rent 115.2.4 Frequency of the test supply 115.2.5 Duration of the test 125.2.6 Supply circuit 145.3 Arc initiation 145.3.1 General 145.3.2 Cable compartments with plug-in or site-made solid insulation connections 155.4 Indicators for observing the thermal effects of gases 165.4.1 General 165.4.2 Ind

47、icator placement 165.4.3 Indicator mounting racks 176 Assessment 196.1 Assessment of test results 196.1.1 General 196.1.2 Criterion No. 1 Deformation 196.1.3 Criterion No. 2 Fragmentation 196.1.4 Criterion No. 3 Burn-through 196.1.5 Criterion No. 4 Indicators 196.1.6 Criterion No. 5 Grounding 196.2

48、Test report 196.3 Marking 206.3.1 Nameplate 206.3.2 Doors and covers 20C22.2 No. 0.22-11 Canadian Standards Associationiv August 20116.3.3 Exhaust system discharge 20AnnexesA(informative) The evolution of arc resistance Standards in Canada 21B(informative) Application guidelines 23C(informative) Pot

49、ential consequences of internal arc faults 31D(normative) Additional performance features 33Tables1 Wire size selection 15Figures1 Vertical indicator frame 182 Horizontal indicator mounting 18 Canadian Standards AssociationEvaluation methods for arc resistanceratings of enclosed electrical equipmentAugust 2011 vTechnical Committee on Industrial ProductsK. Powell Criterions,Glen Williams, OntarioRepresenting ManufacturersChairP. McDonald Alberta Municipal Affairs,Edmonton, AlbertaRepresenting Regulatory AuthoritiesVice-