1、NFPA 70EStandard for Electrical Safety in the Workplace 2015 Edition NFPA, 1 Batterymarch Park, Quincy, MA 02169-7471 An International Codes and Standards Organization 1/14ISBN: 978-145590893-6 (Print)ISBN: 978-145590926-1 (PDF)IMPORTANT NOTICES AND DISCLAIMERS CONCERNING NFPASTANDARDS NOTICE AND DI
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29、ed at no cost at www.nfpa.org/freeaccess.Copyright 2014, National Fire Protection Association. All Rights ReservedNFPA 70EStandard forElectrical Safety in the Workplace2015 EditionThis edition of NFPA 70E, Standard for Electrical Safety in the Workplace, was prepared by theTechnical Committee on Ele
30、ctrical Safety in the Workplace and released by the Correlating Committeeon National Electrical Code. It was issued by the Standards Council on July 14, 2014, with an effectivedate of July 29, 2014, and supersedes all previous editions.A Tentative Interim Amendment (TIA) to 130.7(C)(10)(b)(1) and Ta
31、bles H.3(a) and (b) was issuedon August 14, 2014. For further information on tentative interim amendments, see Section 5 of theRegulations Governing the Development of NFPA Standards, available at http:/www.nfpa.org/regsThis edition of NFPA 70E was approved as an American National Standard on July 2
32、9, 2014.Foreword to NFPA 70EThe Standards Council of the National Fire Protection Association announced on January 7, 1976,the formal appointment of a new electrical standards development committee. Entitled the Committeeon Electrical Safety Requirements for Employee Workplaces, NFPA 70E, this new c
33、ommittee reportedto the Association through the Technical Correlating Committee on National Electrical Code. Thiscommittee was formed to assist OSHA in preparing electrical safety standards that would serve OSHAsneeds and that could be expeditiously promulgated through the provisions of Section 6(b)
34、 of theOccupational Safety and Health Act. OSHA found that in attempting to utilize the latest edition ofNFPA 70, National Electrical Code(NEC), it was confronted with the following problems:(1) Updating to a new edition of the NEC would have to be accomplished through the OSHA 6(b)procedures. OSHA
35、adopted the 1968 and then the 1971 NEC under Section 6(a) procedures of theOccupational Safety and Health Act of 1970. Today, however, OSHA can only adopt or modify astandard by the procedures of Section 6(b) of the OSHA Act, which provide for public notice,opportunity for public comment, and public
36、 hearings. The adoption of a new edition of the NEC bythese procedures would require extensive effort and application of resources by OSHA and others.Even so, going through the Section 6(b) procedures might result in requirements substantiallydifferent from those of the NEC, thereby creating the pro
37、blem of conflict between the OSHAstandard and other national and local standards.(2) The NEC is intended for use primarily by those who design, install, and inspect electrical installa-tions. OSHAs electrical regulations address employers and employees in their workplaces. Thetechnical content and c
38、omplexity of the NEC is extremely difficult for the average employer andemployee to understand.(3) Some of the detailed provisions within the NEC are not directly related to employee safety and,therefore, are of little value for OSHAs needs.(4) Requirements for electrical safety-related work practic
39、es and maintenance of the electrical systemconsidered critical to safety are not found in the NEC, which is essentially an electrical installationdocument. However, OSHA must also consider and develop these safety areas in its regulations.With these problem areas, it became apparent that a need exis
40、ted for a new standard, tailored tofulfill OSHAs responsibilities, that would still be fully consistent with the NEC.The foregoing issues led to the concept that a document be put together by a competent group,representing all interests, that would extract suitable portions from the NEC and from oth
41、er documentsapplicable to electrical safety. This concept and an offer of assistance was submitted in May 1975 to theAssistant Secretary of Labor for OSHA, who responded as follows: “The concept, procedures, andscope of the effort discussed with my staff for preparing the subject standard appear to
42、have great merit,and an apparent need exists for this proposed consensus document which OSHA could consider forNFPA 70E, Standard for Electrical Safety in the Workplace, NFPA, and National Fire Protection Association are registered trademarks of theNational Fire Protection Association, Quincy, Massa
43、chusetts, 02169.70E1promulgation under the provisions of Section 6(b) of the Act. OSHA does have an interest in this effort andbelieves the proposed standard would serve a useful purpose.” With this positive encouragement from OSHA, aproposal to prepare such a document was presented to the NFPA Elec
44、trical Section, which unanimously sup-ported a recommendation that the NEC Correlating Committee examine the feasibility of developing a documentto be used as a basis for evaluating electrical safety in the workplace. In keeping with the recommendation of theElectrical Section and Correlating Commit
45、tee, the Standards Council authorized the establishment of a committeeto carry out this examination.The committee found it feasible to develop a standard for electrical installations that would be compatiblewith the OSHA requirements for safety for the employee in locations covered by the NEC. The n
46、ew standard wasvisualized as consisting of four major parts: Part I, Installation Safety Requirements; Part II, Safety-Related WorkPractices; Part III, Safety-Related Maintenance Requirements; and Part IV, Safety Requirements for SpecialEquipment. Although desirable, it was not considered essential
47、for all of the parts to be completed before thestandard was published and made available. Each part is recognized as being an important aspect of electricalsafety in the workplace, but the parts are sufficiently independent of each other to permit their separate publica-tion. The new standard was na
48、med NFPA 70E, Standard for Electrical Safety Requirements for EmployeeWorkplaces. The first edition was published in 1979 and included only Part I.The second edition was published in 1981. It included Part I as originally published and a new Part II. In1983, the third edition included Part I and Par
49、t II as originally published and a new Part III. In 1988, the fourthedition was published with only minor revisions.The fifth edition, published in 1995, included major revisions to Part I, updating it to conform to the 1993edition of NFPA 70, National Electrical Code (NEC). In Part II of the fifth edition, the concepts of “limits ofapproach” and establishment of an “arc” were introduced. In 2000, the sixth edition included a complete Part Iupdate to the 1999 NEC, as well as a new Part IV. Part II continued to focus on establishing flash protectionboundaries and the us
