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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
