The National Electrical Code (NEC), published by the National Fire Protection Association, is in a sense the Bible that we live by when designing electrical systems. Like the Bible, it is complex, subject to interpretation, and sometimes difficult to understand. Unlike the Bible, however, the NEC is revised every three years. Each new edition becomes law when it is adopted by the state or local jurisdiction that regulates building permits and inspections.
As we approach the end of the year, the 2005 NEC has been adopted by most jurisdictions. This month, we'll look at a few of the changes that are likely to have impact on design and specification of electrical systems and equipment for HVACR and industrial projects. Further information on these and other changes can be found in Analysis of Changes - 2005 NEC, published by the International Association of Electrical Inspectors.