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    NFPA 79-2018 Electrical Standard for Industrial Machinery (Effective Date 11 30 2017).pdf

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    NFPA 79-2018 Electrical Standard for Industrial Machinery (Effective Date 11 30 2017).pdf

    1、79 Electrical Standard for Industrial Machinery 2018 NFPAIMPORTANT NOTICES AND DISCLAIMERS CONCERNING NFPA STANDARDS NOTICE AND DISCLAIMER OF LIABILITY CONCERNING THE USE OF NFPA STANDARDS NFPA codes, standards, recommended practices, and guides (“NFPA Standards”), of which the document contained he

    2、rein is one, are developed through a consensus standards development process approved by the American 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

    3、process and establishes rules to promote fairness in the development of consensus, it does not independently 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 oth

    4、er damages of any nature whatsoever, whether special, indirect, consequential or compensatory, directly 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 her

    5、ein. In issuing and making NFPA Standards available, the NFPA is not undertaking to render professional 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

    6、his or her own independent judgment or, as appropriate, seek the advice of a competent professional 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 t

    7、he NFPA list, certify, test, or inspect products, designs, or installations for compliance with this 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

    8、 statement. REVISION SYMBOLS IDENTIFYING CHANGES FROM THE PREVIOUS EDITION Text revisions are shaded. A before a section number indicates that words within that section were deleted and a to the left of a table or gure number indicates a revision to an existing table or gure. When a chapter was heav

    9、ily revised, the entire chapter is marked throughout with the symbol. Where one or more sections were deleted, a is placed between the remaining sections. Chapters, annexes, sections, gures, and tables that are new are indicated with an N. Note that these indicators are a guide. Rearrangement of sec

    10、tions may not be captured in the markup, but users can view complete revision details in the First and Second Draft Reports located in the archived revision information section of each code at www.nfpa.org/docinfo. Any subsequent changes from the NFPA Technical Meeting, Tentative Interim Amendments,

    11、 and Errata are also located there. ALERT: THIS STANDARD HAS BEEN MODIFIED BY A TIA OR ERRATA Users of NFPA codes, standards, recommended practices, and guides (“NFPA Standards”) should be aware that NFPA Standards may be amended from time to time through the issuance of a Tentative Interim Amendmen

    12、t (TIA) or corrected by Errata. An ofcial NFPA Standard at any point in time consists of the current edition of the document together with any TIAs and Errata then in effect. To determine whether an NFPA Standard has been amended through the issuance of Tentative Interim Amendments or corrected by E

    13、rrata, go to www.nfpa.org/docinfo to choose from the list of NFPA Standards or use the search feature to select the NFPA Standard number (e.g., NFPA 13). The document information page provides up-to-date document-specic information as well as postings of all existing TIAs and Errata. It also include

    14、s the option to register for an “Alert” feature to receive an automatic email notication when new updates and other information are posted regarding the document. ISBN: 978-145591898-0 (Print) ISBN: 978-145591899-7 (PDF) ISBN: 978-145591900-0 (eBook)IMPORTANT NOTICES AND DISCLAIMERS CONCERNING NFPA

    15、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 documents may be superseded at any time by the issuance of new editions or may be amended from time to time through

    16、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 Interim Amendments and any Errata then in effect. In order to determine whether a given document is the curren

    17、t 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 the National Fire Codes Subscription Service, visit the NFPA website at www.nfpa.org, or contact the NFPA at the a

    18、ddress 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 NFPA Standards shall not be considered the ofcial position of NFPA or any of its Committees and shall not be conside

    19、red 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 asserted in connection with an NFPA Standard. The users of NFPA Standards bear the sole responsibility for determinin

    20、g 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 or reliance on NFPA Standards. NFPA adheres to the policy of the American National Standards Institute (ANSI) re

    21、garding 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 called to the possibility that compliance with an NFPA Standard may require use of an invention covered by patent

    22、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. If, in connection with the ANSI Patent Policy, a patent holder has led a statement of willingness to grant licen

    23、ses 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, from NFPA. For further information, contact the NFPA at the address listed below. Law and Regulations Users of N

    24、FPA 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, intend to urge action that is not in compliance with applicable laws, and these documents may not be construed as doin

    25、g 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, and use in private self-regulation, standardization, and the promotion of safe practices and methods. By making

    26、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 regulatory purposes should be accomplished through adoption by reference. The term “adoption by reference” means the c

    27、iting 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 order to assist NFPA in following the uses made of its documents, adopting authorities are requested to notify t

    28、he 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. For Further Information All questions or other communications relating to NFPA Standards and all requests for inf

    29、ormation on NFPA procedures governing its codes and standards development process, including information on the procedures for requesting Formal Interpretations, for proposing Tentative Interim Amendments, and for proposing revisions to NFPA standards during regular revision cycles, should be sent t

    30、o 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 information about NFPA, visit the NFPA website at www.nfpa.org. All NFPA codes and standards can be viewed at no c

    31、ost at www.nfpa.org/docinfo.79-1 NFPA and National Fire Protection Association are registered trademarks of the National Fire Protection Association, Quincy, Massachusetts 02169. Copyright 2017 National Fire Protection Association . All Rights Reserved. NFPA 79 Electrical Standard for Industrial Mac

    32、hinery 2018 Edition This edition of NFPA 79, Electrical Standard for Industrial Machinery, was prepared by the Technical Committee on Electrical Equipment of Industrial Machinery and released by the Correlating Committee on National Electrical Code . It was issued by the Standards Council on Novembe

    33、r 10, 2017, with an effective date of November 30, 2017, and supersedes all previous editions. This edition of NFPA 79 was approved as an American National Standard on November 30, 2017. Origin and Development of NFPA 79 This standard was rst submitted at the 1961 NFPA Annual Meeting under the title

    34、 Electrical Standard for Machine Tools and was tentatively adopted subject to comments. It was extensively revised and resubmitted at the 1962 Annual Meeting, where it was ofcially adopted. In 1965 a revised edition was adopted, reconrmed in 1969, and in 1970, 1971, 1973, 1974, 1977, 1980, 1985, 198

    35、7, 1991, 1994, 1997, 2002 and 2007, revised editions were adopted. In September 1941, the metalworking machine tool industry wrote its rst electrical standard to make machine tools safer to operate, more productive, and less costly to maintain, and to improve the quality and performance of their ele

    36、ctrical components. That particular standard served as an American “War Standard.” To study the special electrical problems involved with machine tools, in 1941 the Electrical Section of the National Fire Protection Association sanctioned a Special Subcommittee on Wiring, Overcurrent Protection, and

    37、 Control of Motor-Operated Machine Tools. This subcommittee, cooperating with machine tool builders, manufacturers of control equipment, and Underwriters Laboratories Inc., conducted tests and investigated the peculiar conditions involved with machine tools that might warrant exception to certain sp

    38、ecic National Electrical Code requirements. This investigation resulted, on August 4, 1942, in a Tentative Interim Amendment and rst appeared in a 1943 supplement to the 1940 edition of NFPA 70 , National Electrical Code (NEC), as Article 670, “Machine Tools.” It remained essentially unchanged throu

    39、gh the 1959 edition. Meanwhile, manufacturers of other types of industrial equipment erroneously began to follow the specialized practices permitted by Article 670. Late in 1952, a Technical Subcommittee on Fundamentals of Electrically Operated Production Machinery and Material Handling and Processi

    40、ng Equipment for Fixed Locations was organized to attempt to group the special requirements of this broad eld into one article. The extremely broad scope introduced so many problems that, in December 1956, this technical subcommittee was reorganized into an NFPA committee whose scope was limited to

    41、machine tools and whose objective was the preparation of this NFPA standard with corresponding revisions in Article 670 in the National Electrical Code. Modern machine tool electrical equipment may vary from that of single-motor machines, such as drill presses, that perform simple, repetitive operat

    42、ions, to that of very large, multimotored automatic machines that involve highly complex electrical control systems, including electronic and solid-state devices and equipment. Generally these machines are specially designed, factory wired, and tested by the builder and then erected in the plant in

    43、which they will be used. Because of their importance to plant production and their usually high cost, they are customarily provided with many safeguards and other devices not often incorporated in the usual motor and control application as contemplated by the National Electrical Code. Although these

    44、 machines may be completely automatic, they are constantly attended, when operating, by highly skilled operators. The machine usually incorporates many special devices to protect the operator, protect the machine and building against res of electrical origin, protect the machine and work in process

    45、against damage due to electrical failures, and protect against loss ofINDUSTRIAL MACHINERY 79-2 2018 Edition production due to failure of a machine component. To provide these safeguards, it may be preferable to deliberately sacrice a motor or some other component, rather than to chance injury to th

    46、e operator, the work, or the machine. It is because of such considerations that this standard varies from the basic concepts of motor protection as contained in the National Electrical Code. As NFPA 79 evolved, it became apparent that certain classes of light industrial machinery (e.g., small drill

    47、presses, bench grinders, sanders) were not appropriately covered. The 1977 edition of the standard recognized this problem and purposely excluded tools powered by 2 hp or less. Subsequent to publication of the 1977 standard, a light industrial machinery standard development activity was initiated by

    48、 the Power Tool Institute. The 1985 edition of NFPA 79 reects this activity, and appropriate requirements are now included in the standard. In 1975, the Society of the Plastics Industry requested that this standard be enlarged in scope to include plastics machinery. A formal request was received by

    49、NFPA in September 1978, and, through the combined efforts of the NFPA 79 committee and representatives of the Society of the Plastics Industry, the scope was broadened to include such machinery in the 1980 edition. In June 1981, the Joint Industrial Council (JIC) Board of Directors acknowledged the dated state of the electrical and electronic standards and requested that NFPA 79 incorporate into its standard the material and topics covered by the JIC electrical (EMP-1-67, EGP-1-67) and electronic (EL-1-71) standards with the intention that the JI


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