NFPA 70B-2016 Recommended Practice for Electrical Equipment Maintenance (Effective Date 12 4 2015).pdf

1、70B NFPA Recommended Practice for Electrical Equipment Maintenance 2016 ORDER T o order or for more details on other NFPA products or seminars, call 1-800-344-3555. For orders outside the U.S., call 617-770-3000. VISIT our online catalog at catalog.nfpa.org.IMPORTANT NOTICES AND DISCLAIMERS CONCERNI

2、NG NFPA DOCUMENTS NOTICE AND DISCLAIMER OF LIABILITY CONCERNING THE USE OF NFPA DOCUMENTS NFPA codes, standards, recommended practices, and guides (“NFPA Standards”), of which the document contained herein is one, are developed through a consensus standards development process approved by the Americ

3、an National Standards Institute. This process brings together volunteers representing varied viewpoints and interests to achieve consensus on re and other safety issues. While the NFPA administers the process and establishes rules to promote fairness in the development of consensus, it does not inde

4、pendently test, evaluate, or verify the accuracy of any information or the soundness of any judgments contained in NFPA Standards. The NFPA disclaims liability for any personal injury, property or other damages of any nature whatsoever, whether special, indirect, consequential or compensatory, direc

5、tly or indirectly resulting from the publication, use of, or reliance on NFPA Standards. The NFPA also makes no guaranty or warranty as to the accuracy or completeness of any information published herein. In issuing and making NFPA Standards available, the NFPA is not undertaking to render professio

6、nal or other services for or on behalf of any person or entity. Nor is the NFPA undertaking to perform any duty owed by any person or entity to someone else. Anyone using this document should rely on his or her own independent judgment or, as appropriate, seek the advice of a competent professional

7、in determining the exercise of reasonable care in any given circumstances. The NFPA has no power, nor does it undertake, to police or enforce compliance with the contents of NFPA Standards. Nor does the NFPA list, certify, test, or inspect products, designs, or installations for compliance with this

8、 document. Any certication or other statement of compliance with the requirements of this document shall not be attributable to the NFPA and is solely the responsibility of the certier or maker of the statement. REMINDER: UPDATING OF NFPA STANDARDS Users of NFPA codes, standards, recommended practic

9、es, and guides (“NFPA Standards”) should be aware that NFPA Standards may be amended from time to time through the issuance of Tentative Interim Amendments or corrected by Errata. An ofcial NFPA Standard at any point in time consists of the current edition of the document together with any Tentative

10、 Interim Amendment and any Errata then in effect. In order to determine whether an NFPA Standard has been amended through the issuance of Tentative Interim Amendments or corrected by Errata, visit the Document Information Pages on NFPAs website. The Document Information Pages provide up-to-date, doc

11、ument specic information including any issued Tentative Interim Amendments and Errata. To access the Document Information Page for a specic NFPA Standard, go to http:/ www.nfpa.org/docinfo to choose from the list of NFPA Standards or use the search feature on the right to select the NFPA Standard nu

12、mber (e.g., NFPA 101). The Document Information page includes postings of all existing Tentative Interim Amendments and Errata. It also includes the option to register for an “Alert” feature to receive an automatic email notication when new updates and other information are posted regarding the docu

13、ment. ISBN: 978-145591302-2 (Print) ISBN: 978-145591332-9 (PDF)IMPORTANT NOTICES AND DISCLAIMERS CONCERNING NFPA STANDARDS ADDITIONAL NOTICES AND DISCLAIMERS Updating of NFPA Standards Users of NFPA codes, standards, recommended practices, and guides (“NFPA Standards”) should be aware that these doc

14、uments may be superseded at any time by the issuance of new editions or may be amended from time to time through the issuance of Tentative Interim Amendments or corrected by Errata. An ofcial NFPA Standard at any point in time consists of the current edition of the document together with any Tentati

15、ve Interim Amendments and any Errata then in effect. In order to determine whether a given document is the current edition and whether it has been amended through the issuance of Tentative Interim Amendments or corrected through the issuance of Errata, consult appropriate NFPA publications such as t

16、he National Fire Codes Subscription Service, visit the NFPA website at www.nfpa.org, or contact the NFPA at the address listed below. Interpretations of NFPA Standards A statement, written or oral, that is not processed in accordance with Section 6 of the Regulations Governing the Development of NFP

17、A Standards shall not be considered the ofcial position of NFPA or any of its Committees and shall not be considered to be, nor be relied upon as, a Formal Interpretation. Patents The NFPA does not take any position with respect to the validity of any patent rights referenced in, related to, or asse

18、rted in connection with an NFPA Standard. The users of NFPA Standards bear the sole responsibility for determining the validity of any such patent rights, as well as the risk of infringement of such rights, and the NFPA disclaims liability for the infringement of any patent resulting from the use of

19、 or reliance on NFPA Standards. NFPA adheres to the policy of the American National Standards Institute (ANSI) regarding the inclusion of patents in American National Standards (“the ANSI Patent Policy”), and hereby gives the following notice pursuant to that policy: NOTICE: The users attention is c

20、alled to the possibility that compliance with an NFPA Standard may require use of an invention covered by patent rights. NFPA takes no position as to the validity of any such patent rights or as to whether such patent rights constitute or include essential patent claims under the ANSI Patent Policy.

21、 If, in connection with the ANSI Patent Policy, a patent holder has led a statement of willingness to grant licenses under these rights on reasonable and nondiscriminatory terms and conditions to applicants desiring to obtain such a license, copies of such led statements can be obtained, on request,

22、 from NFPA. For further information, contact the NFPA at the address listed below. Law and Regulations Users of NFPA Standards should consult applicable federal, state, and local laws and regulations. NFPA does not, by the publication of its codes, standards, recommended practices, and guides, inten

23、d to urge action that is not in compliance with applicable laws, and these documents may not be construed as doing so. Copyrights NFPA Standards are copyrighted. They are made available for a wide variety of both public and private uses. These include both use, by reference, in laws and regulations,

24、 and use in private self-regulation, standardization, and the promotion of safe practices and methods. By making these documents available for use and adoption by public authorities and private users, the NFPA does not waive any rights in copyright to these documents. Use of NFPA Standards for regul

25、atory purposes should be accomplished through adoption by reference. The term “adoption by reference” means the citing of title, edition, and publishing information only. Any deletions, additions, and changes desired by the adopting authority should be noted separately in the adopting instrument. In

26、 order to assist NFPA in following the uses made of its documents, adopting authorities are requested to notify the NFPA (Attention: Secretary, Standards Council) in writing of such use. For technical assistance and questions concerning adoption of NFPA Standards, contact NFPA at the address below.

27、For Further Information All questions or other communications relating to NFPA Standards and all requests for information on NFPA procedures governing its codes and standards development process, including information on the procedures for requesting Formal Interpretations, for proposing Tentative I

28、nterim Amendments, and for proposing revisions to NFPA standards during regular revision cycles, should be sent to NFPA headquarters, addressed to the attention of the Secretary, Standards Council, NFPA, 1 Batterymarch Park, P.O. Box 9101, Quincy, MA 02269-9101; email: stds_adminnfpa.org For more in

29、formation about NFPA, visit the NFPA website at www.nfpa.org. All NFPA codes and standards can be viewed at no cost at www.nfpa.org/freeaccess.70B-1 NFPA and National Fire Protection Association are registered trademarks of the National Fire Protection Association, Quincy, Massachusetts 02169. Copyr

30、ight 2015 National Fire Protection Association . All Rights Reserved. NFPA 70B Recommended Practice for Electrical Equipment Maintenance 2016 Edition This edition of NFPA 70B, Recommended Practice for Electrical Equipment Maintenance, was prepared by the Technical Committee on Electrical Equipment M

31、aintenance and released by the Correlating Committee on National Electrical Code . It was issued by the Standards Council on November 14, 2015, with an effective date of December 4, 2015, and supersedes all previous editions. This edition of NFPA 70B was approved as an American National Standard on

32、December 4, 2015. Origin and Development of NFPA 70B The National Electrical Code Committee had received several requests to include maintenance recommendations in the National Electrical Code (NEC ). The National Electrical Code Correlating Committee determined that the NEC was not the proper docum

33、ent in which to cover the maintenance of electrical equipment. However, the committee recognized that “lack-of- maintenance” frequently resulted in serious injuries and fatalities as well as high monetary damage. An ad hoc committee on electrical equipment maintenance was authorized by NFPA in 1967

34、to determine the need for the development of a document on the subject. The document would give recommendations on the maintenance of various types of electrical installations, apparatus, and equipment usually found in industrial and large commercial-type installations. The ad hoc committee noted th

35、at electrical safety information broke down logically into four main subdivisions: (1) design or product standards, (2) installation standards (the NEC and the National Electrical Safety Code ), (3) maintenance recommendations, and (4) use instructions. Work had not yet started on NFPA 70E , Standar

36、d for Electrical Safety in the Workplace. In the interest of electrical safety, the committee explored whether something more needed to be done on the maintenance of electrical equipment. Equipment manufacturers typically provide maintenance needs for specic types of equipment, and general maintenan

37、ce guidance was available from a number of sources. Therefore, it was determined that compiling that information into a single document under the NFPA procedure in the form of general guidelines was advantageous. To this end, a tentative scope was presented to the NFPA Board of Directors with a reco

38、mmendation that a committee on electrical equipment maintenance be authorized. On June 27, 1968, NFPA authorized the establishment of the Committee on Electrical Equipment Maintenance with the following scope: “To develop suitable texts relating to preventive maintenance of electrical systems and eq

39、uipment used in industrial-type applications with the view of reducing loss of life and property. The purpose is to correlate generally applicable procedures for preventive maintenance that have broad application to the more common classes of industrial electrical systems and equipment without dupli

40、cating or superseding instructions that manufacturers normally provide. Reports to the Association through the Correlating Committee of the National Electrical Code Committee.” In 1973, NFPA 70B-T, Tentative Recommended Practice for Electrical Equipment Maintenance, represented the cumulative effort

41、 of the committee. The chapters covered “Why an Electrical Preventive Maintenance (EPM) Program Pays Dividends,” “What Is an Effective Electrical Preventive Maintenance Program?,” and “Planning and Developing an Electrical Preventive Maintenance Program.” The document was revised in 1974 to include

42、a chapter on the fundamentals of electrical equipment maintenance, general maintenance requirements for various types of equipment, and a new appendix, “How to Instruct.” The tentative recommended practice was adopted as NFPA 70B, Recommended Practice for Electrical Equipment Maintenance, in 1975.EL

43、ECTRICAL EQUIPMENT MAINTENANCE 70B-2 2016 Edition For the 1977 edition, titles of added chapters included Electronic Equipment, Ground-Fault Protection, Wiring Devices, and Maintenance of Electrical Equipment Subject to Long Intervals Between Shutdowns. New appendices addressed NEMA plug and recepta

44、cle congurations and guidelines for long-term maintenance. In the 1983 edition, chapters on cable tray systems and on deenergizing and grounding of equipment to provide protection for maintenance personnel were added. An appendix covering equipment storage and maintenance during construction was als

45、o added. The 1987 edition included distribution transformers as well as power transformers. A chapter on uninterruptible power supply systems was added in the 1990 edition. The chapter Testing and Test Methods was amended by the addition of diagrams of different wave shapes for detecting problems in

46、 motors and generators using surge testing. Three new chapters were added to the 1994 edition to cover power system studies, power quality, and vibration analysis pertaining to rotating machinery. The additions included a table on suggested vibration limits and a vibration severity chart for various

47、-sized machines. Other revisions were made to comply with the NFPA Manual of Style. For the 1998 edition, the chapter on power quality was rewritten and expanded. Maintenance techniques for stationary batteries and infrared inspections were updated and revised. Special handling and disposal consider

48、ations were introduced, and employee training was focused to emphasize workplace safety. The 2002 edition was restructured to comply with the Manual of Style for NFPA Technical Committee Documents. The scope was revised to include preventive maintenance for electronic and communications equipment. A

49、 chapter added for grounding provided denitions, symptoms, inspection, testing techniques, and solutions to grounding issues. A new section for gas insulated substations addressed the maintenance issues resulting from regulatory changes in the electrical utility industry. Charts were added for troubleshooting motor controllers, switchboards, and panelboards. The chapter on power quality was enhanced with information on the latest technology on voltage uctuation. A new annex suggested maintenance intervals for electrical equipment. The 2006 edition includ