1、C22.2 No. 254-05(reaffirmed 2015)Motor Control CentresUpdate No. 2C22.2 No. 254-05July 2011Note: General Instructions for CSA Standards are now called Updates. Please contact CSA Information Products Sales or visit www.ShopCSA.ca for information about the CSA Standards Update Service.Title: Motor Co
2、ntrol Centres originally published August 2005Revisions issued: Update No. 1 August 2006If you are missing any updates, please contact CSA Information Products Sales or visit www.ShopCSA.ca.The following revisions have been formally approved and are marked by the symbol delta () in the margin on the
3、 attached replacement pages: Update your copy by inserting these revised pages.Keep the pages you remove for reference.Revised Title page, copyright page, preface, Clauses 4.2, 6.3.8, 6.3.14.2, 6.3.39, 6.3.50, 8.1.7.1, 8.2.4.1, 8.2.10.3, 8.2.16.2, 8.2.20.7, 8.2.26.11, 8.2.31.3.1, 8.3.10, 9.3.4, 9.3.
4、18, 9.8.2, 9.10.3.3, 9.10.6.1, 9.10.6.2, 9.10.7, 9.10.8.1, 9.10.10.5, 9.12.1.6, 9.12.3.1, 9.12.6.3, and 9.15.2.3, Tables 79, 19, 20, 22, 24, 27, and 33, and Annex BNew Clauses 6.3.62, 8.2.13.15, 8.2.13.16, 8.2.25.6, and 9.12.6.3ADeleted NoneAssociation of Standardization and CertificationNMX-J-353-A
5、NCE-2006Second EditionCanadian Standards AssociationCSA C22.2 No. 254-05First EditionUnderwriters Laboratories Inc.UL 845Fifth EditionANSI/UL 845-2011Motor Control CentresAugust 31, 2005(Title page reprinted: July 15, 2011)Commitment for AmendmentsThis standard is issued jointly by the Association o
6、f Standardization and Certification (ANCE), the Canadian Standards Association (CSA), and Underwriters Laboratories Inc. (UL). Comments or proposals for revisions on any part of the standard may be submitted to ANCE, CSA, or UL at any time. Revisions to this standard will be made only after processi
7、ng according to the standards development procedures of ANCE, CSA, and UL. CSA and UL will issue revisions to this standard by means of a new edition or revised or additional pages bearing their date of issue. ANCE will incorporate the same revisions into a new edition of the standard bearing the sa
8、me date of issue as the CSA and UL pages. Copyright 2006 ANCE Rights reserved in favour of ANCE.ISBN 1-55397-107-8 2005 Canadian Standards Association All rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior permission of the publisher.CSA Standards
9、 are subject to periodic review, and suggestions for their improvement will be referred to the appropriate committee. To submit a proposal for change to CSA Standards, please send the following information to inquirescsa.ca and include “Proposal for change” in the subject line: Standard designation
10、(number); relevant clause, table, and/or figure number; wording of the proposed change; and rationale for the change.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.Copyright 2005, 2011 Underwriters Labora
11、tories Inc.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 copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL.This ANSI/UL Stand
12、ard for Safety consists of the Fifth edition with revisions through July 15, 2011. The most recent designation of ANSI/UL 845 as an American National Standard (ANSI) occurred on July 15, 2011. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page (front and back
13、), or the Preface.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:/.The Department of Defense (DoD) has adopted UL 845 on
14、April 20, 1993. The publication of revised pages or a new edition of this Standard will not invalidate the DoD adoption.To purchase UL Standards, visit Comm 2000 at http:/m- or call toll-free 1-888-853-3503.JULY 15, 2011 NMX-J-353-ANCE-2006 CSA C22.2 NO. 254-05 UL 845 5PrefaceThis is the harmonized
15、ANCE, CSA, and UL standard for motor control centres. It is the second edition ofNMX-J-353-ANCE, the first edition of CSA C22.2 No. 254, and the fifth edition of UL 845. This edition ofUL 845 supersedes the previous edition published on February 15th, 1995.This harmonized standard was prepared by th
16、e Association of Standardization and Certification (ANCE),the Canadian Standards Association (CSA), and Underwriters Laboratories Inc. (UL). The efforts andsupport of the CANENA Technical Harmonization Subcommittee 17D Motor Control Centres aregratefully appreciated.The present Mexican standard was
17、developed by the CT CDI Control y Distribucion Industrial from theComite de Normalizacion de la Asociacion de Normalizacion y Certificacion, A.C., CONANCE, with thecollaboration of the motor control centres, manufacturers, and users.This standard was reviewed by the CSA Subcommittee on Motor Control
18、 Centres, under the jurisdiction ofthe CSA Technical Committee on Industrial Products and the CSA Strategic Steering Committee onRequirements for Electrical Safety, and has been formally approved by the CSA Technical Committee.This standard has been approved by the American National Standards Instit
19、ute (ANSI) as an AmericanNational Standard.A UL standard is current only if it incorporates the most recently adopted revisions, all of which areitemized on the transmittal notice that accompanies the latest set of revised requirements.Where reference is made to a specific number of samples to be te
20、sted, the specified number is to beconsidered a minimum quantity.Note: Although the intended primary application of this standard is stated in its scope, it is important to note that it remains the responsibility of the users of the standard to judge its suitability for their particular purpose.Leve
21、l of harmonizationThis standard is published as an identical standard for ANCE, CSA, and UL. An identical standard is astandard that is exactly the same in technical content except for national differences resulting fromconflicts in codes and governmental regulations. Presentation is word for word e
22、xcept for editorialchanges.InterpretationsThe interpretation by the standards development organization of an identical or equivalent standard isbased on the literal text to determine compliance with the standard in accordance with the procedural rulesof the standards development organization. If mor
23、e than one interpretation of the literal text has beenidentified, a revision is to be proposed as soon as possible to each of the standards developmentorganizations to more accurately reflect the intent. ANCE effective dateThe effective date for ANCE will be announced through the Diario Oficial de l
24、a Federacin (OfficialGazette) and is indicated on the cover page.CSA effective dateThe effective date for CSA International will be announced through CSA Informs or a CSA certificationnotice.6 NMX-J-353-ANCE-2006 CSA C22.2 NO. 254-05 UL 845 JULY 15, 2011UL effective dateAs of July 15, 2011 all produ
25、cts Listed or Recognized by UL must comply with the requirements in thisstandard.A UL effective date is one established by Underwriters Laboratories Inc. and is not part of the ANSI approved standard.NMX-J-353-ANCE-2006 CSA C22.2 NO. 254-05 UL 8451.4 Units of measurementThe first values given are SI
26、 (metric) units. Alternate measurements shown in parentheses are US customary units, which sometimes are not strict conversions.2 Normative referencesThe normative references listed in Annex C contain provisions which, through reference in this text, constitute provisions of this standard. Any undat
27、ed reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the edition of that code or standard and all published changes up to the time when this standard was approved.In Canada, general requirements are as indicated in Annex C, item 16.3
28、Definitions3.1 For the purposes of this standard, the following apply.3.2 auxiliary devices types of devices such as indicating meters (instruments), current transformers, control devices, control relays, timers, protective relays or protective devices, communications devices, etc.3.3 available shor
29、t-circuit current the short-circuit current available at the equipment line terminals plus any motor contribution. The available ac short-circuit current is expressed in rms symmetrical A.3.4 bus, horizontal a bus that extends through a motor control centre section.3.5 bus, vertical a bus that serve
30、s the units in a section and that originates from the horizontal bus. This bus may be replaced by insulated wiring.3.6 Class I motor control centres mechanical groupings of combination motor control units, feeder-tap units, other units, and electrical devices arranged in an assembly. (See Annex H.)3
31、.7 Class II motor control centres a Class I motor control centre provided with manufacturer-furnished electrical interlocking and wiring between units, as specifically described in overall control system diagrams supplied by the user. (See Annex H.)3.8 combination controller unit a control unit cont
32、aining a magnetic or solid-state controller and an externally operable disconnecting means and overcurrent protection. The controller may or may not contain motor overload protection.3.9 combination motor control unit a control unit that contains components that perform the following functions: exte
33、rnally operable circuit-disconnecting means, motor branch-circuit overcurrent protection, motor overload protection, and motor control.NOTE Two sets of externally operable circuit-disconnecting means, each with branch-circuit overcurrent protection and motor controller, may be mounted in a single co
34、mpartment to form a dual unit.3.10 dummy fuse a current-carrying part made of copper and having such dimensions that it will fit its fuse mounting means with the same conditions of pressure, contact, and cross-sectional areas as are obtained on terminals of the fuse that it is intended to replace.9A
35、UGUST 31, 2005NMX-J-353-ANCE-2006 CSA C22.2 NO. 254-05 UL 8453.11 feeder-tap unit a unit that includes an externally operable circuit-disconnecting means and branch-circuit overcurrent protection, principally used for non-motor loads.NOTE Two sets of externally operable circuit means, each with bran
36、ch-circuit overcurrent protection, may be mounted in a single compartment to form a dual unit.3.12 main bonding jumper the connection between the grounded circuit conductor and the equipment grounding conductor at the service.3.13 motor control centre a floor-mounted assembly of one or more enclosed
37、 vertical sections typically having a horizontal common power bus and principally containing combination motor control units.NOTE Usually, units are mounted one above the other in the vertical sections. The sections normally incorporate vertical buses connected to the common power bus, thus extendin
38、g the common power supply to the individual units. Power may be supplied to the individual units by bus bar connections, by stab connections, or by suitable wiring.3.14 motor control centre section the vertical enclosure and assembly that is prevented by the structural framework from being physicall
39、y separated into smaller parts and is intended to receive individual combination motor control units. The function of the vertical section is to support the horizontal and vertical buses, units, covers, and doors when the doors are not mounted directly to the unit.3.15 service equipment the necessar
40、y equipment, usually consisting of a circuit-breaker or switch and fuses, and their accessories, located near the point of entrance of supply conductors to a building or other structure, or an otherwise defined area, and intended to constitute the main control and means of cut-off of the supply.3.16
41、 system bonding jumper the connection between the grounded circuit conductor and the equipment grounding conductor at a separately derived system.3.17 Type A wiring user (field) load and control wiring connected directly to device terminals internal to the unit. (See Annex H.)3.18 Type B wiring user
42、 (field) control wiring connected to unit terminal blocks; the field load wiring is connected either to power terminal blocks or directly to the device terminals. Terminal blocks are internal or adjacent to the unit. (See Annex H.)3.19 Type C wiring user (field) control wiring connected to master te
43、rminal blocks; the field load wiring is connected either to master power terminal blocks or directly to the device terminals. Master terminal blocks are mounted at the top or bottom of the vertical sections that contain combination motor-control units or control assemblies. (See Annex H.)4 Applicati
44、on information and components4.1 Recommended classifications and application information are given in Annex H.4.2 Components4.2.1 A component of a product covered by this standard shall comply with the requirements for that component. See Annex D for a list of standards covering components generally
45、 used in the products covered by this standard. A component shall comply with the ANCE, CSA, or UL standards as appropriate for the country where the product is to be used.4.2.2 A component shall be used in accordance with its rating established for the intended conditions of use except as otherwise
46、 permitted in this standard.10 JULY 15, 2011NMX-J-353-ANCE-2006 CSA C22.2 NO. 254-05 UL 845(c) termination and wiring information, as follows:(1) tightening torque for field-installed conductors (pound-inches, lb-in, or N-m). In Mexico, N-m is required as a minimum;(2) required temperature rating fo
47、r field installed power conductors (C);(3) material requirements for conductors (Cu, Al, Cu-Al, Al-Cu).6.2.2 The following information shall be given by the manufacturer for units:(a) electrical ratings (see Clause 5.1.2);(b) technical information, as follows:(1) wiring diagrams or tables;(2) curren
48、t element tables for overload relays, where applicable;(3) instantaneous-trip circuit-breaker setting information, where applicable.(c) service disconnect (see Annex G);(d) if applicable, suitability for use as service entrance equipment (see Annex G);(e) termination and wiring information, as follo
49、ws:(1) tightening torque for field-installed power conductors (pound-inches, lb-in, or N-m). In Mexico, N-m is required as a minimum;(2) required temperature rating for field-installed conductors (C);(3) material requirements for conductors (Cu, Al, Cu-Al, Al-Cu).6.3 Marking6.3.1 All markings shall be in the appropriate language (or symbols as noted in this standard), as necessary, for the country in which the motor control centre will be installed (Spanish for
