The 2002 National Electrical Code uses a dual system of measurements.
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National Electrical Code 2002 (softcover) (National Fire Protection Association National Electrical Code)


The #1 electrical reference, the 2002 National Electrical Code, is now available through today's #1 electrical publisher, Delmar Publishers! The single most important reference in the electrical industry, the National Electrical Code (NEC), is updated every three years and outlines minimum standards for all types of electrical installations. Adopted as law by states, cities, and municipalities, the 2002 edition of the NEC features newly adopted articles on transient voltage surge suppressors (Article 285), sensitive electronic equipment (Article 647), fuel cells (Article 692), and more! The latest administrative rules (e.g., Article 80) and safety rules (e.g., Article 100 on flash protection and Article 430 on motor disconnect locations) are also included. An excellent resource for anyone involved in electrical design, installation, and inspection, NEC 2002 provides 100% of the information needed to meet Code and avoid costly errors in electrical installations of all types. Delmar is pleased to make this authoritative reference by the NFPA - containing the most widely accepted and most frequently used criteria for electrical installations in the U.S. - available directly from us for the convenience of our customers who work in and around the electrical trades. It may be used independently or as a companion to any electrical book, including Delmar's best-selling wiring series as well as our guides to understanding and using the NEC.

It should be noted that the 2002 National Electrical Code doesn’t contain equivalent metric dimensions for conductor sizes. Conductors sizes are still expressed in AWG (American Wire Gauge) for sizes 27 through 4/0, and in kcmil (thousand circular mils) for sizes 250 through 2000. What about electrical units? All standard electrical units used in the NEC such as volts, amperes, volt-amperes, kilowatts, ohms, farads, henries, etc. are an accepted part of the International System of Units (SI). So there is no change in these familiar quantities for the new 2002 edition. How is compliance judged? Section 90.9(D) specifically states that the conversion from inch-pound to metric units can be approximate, and that complying with either set of numbers constitutes compliance with the Code. In other words, if 110.31 requires a fence not less than 2.1 m (7 ft) high around electrical equipment operating at more than 600 volts, the authority having jurisdiction can measure its height with either an inch-foot ruler or a centimeter-meter ruler. If the fence measures either 2.1 meters or 7 feet high, it is considered to be in compliance with the requirements of NEC 110.31.