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1015™ IEEE Recommended Practice for Applying Low Voltage Circuit Breakers Used in Industrial and Commercial Power Systems Published by the Institute of Electrical and Electronics Engineers, Inc. IEEE Std 1015™-2006 (Revision of IEEE Std 1015-1997) Recognized as an American National Standard (ANSI) IEEE Std 1015™-2006 (Revision of IEEE Std 1015-1997) IEEE Recommended Practice for Applying Low-Voltage Circuit Breakers Used in Industrial and Commercial Power Systems Sponsor Power Systems Protection Committee of the IEEE Industry Applications Society Approved 5 September 2006 American National Standards Institute Approved 30 March 2006 IEEE-SA Standards Board Abstract: Information is provided for selecting the proper circuit breaker for a particular application. This recommended practice helps the application engineer specify the type of circuit breaker, ratings, trip functions, accessories, acceptance tests, and maintenance requirements. It also discusses circuit breakers for special applications, e.g., instantaneous only and switches. In addition, it provides information for applying circuit breakers at different locations in the power system, and for protecting specific components. Guidelines are also given for coordinating combinations of line-side and load-side devices. Keywords: circuit breakers, circuit breaker evaluation, insulated case, insulatedcase circuit breakers, low-voltage circuit breaker, low-voltage power circuit breaker, low-voltage protection, low-voltage protection device, molded case, molded-case circuit breaker, overcurrent protection, power circuit breaker, rating, testing Grateful acknowledgement is made to the following organizations for having granted permission to reprint material in this document as follows: Siemens Energy & Automation, Inc., Switchgear & Motor Control, P.O. Box 29503, Raleigh, NC 27626-0503, for Figure 1-2 and Figure 6-1 (right photo). Square D Company, Distribution Equipment Business, Box 3069, 3700 Sixth Street S.W., Cedar Rapids, IA 52406, for Figure 1-1, Figure 6-1 (left photo), and Figure 6-2. The Institute of Electrical and Electronics Engineers, Inc. 3 Park Avenue, New York, NY 10016-5997, USA Copyright © 2006 by the Institute of Electrical and Electronics Engineers, Inc. All rights reserved. Published 29 September 2006. Printed in the United States of America. IEEE is a registered trademark in the U.S. Patent & Trademark Office, owned by the Institute of Electrical and Electronics Engineers, Incorporated. National Electrical Safety Code and NESC are registered trademarks and service marks in the U.S. Patent & Trademark Office, owned by the Institute of Electrical and Electronics Engineers, Incorporated. National Electrical Code and NEC are registered trademarks in the U.S. Patent & Trademark Office, owned by The National Fire Protection Association. Print: PDF: ISBN 0-7381-4954-3 SH95531 ISBN 0-7381-4955-1 SS95531 No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. IEEE Standards documents are developed within the IEEE Societies and the Standards Coordinating Committees of the IEEE Standards Association (IEEE-SA) Standards Board. The IEEE develops its standards through a consensus development process, approved by the American National Standards Institute, which brings together volunteers representing varied viewpoints and interests to achieve the final product. Volunteers are not necessarily members of the Institute and serve without compensation. While the IEEE administers the process and establishes rules to promote fairness in the consensus development process, the IEEE does not independently evaluate, test, or verify the accuracy of any of the informa