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The NEC contracts now form a suite of contracts, with NEC being the brand name for the "family" of contracts. [16] When it was first launched in 1993, it was simply the "New Engineering Contract". This specific contract has been renamed the "Engineering and Construction Contract" which is the main contract used for any construction based project.
NEC-4 modified NEC-3 to better model very small antennas, like those on cell phones and WiFi routers. The most recent version, 4.2, includes a better version of the Sommerfeld model used in NEC-3 for in- and near-ground wires, added current sources instead of just voltage sources as in earlier models, and used a new memory management system ...
The National Electrical Code, 2008 edition. The National Electrical Code (NEC), or NFPA 70, is a regionally adoptable standard for the safe installation of electrical wiring and equipment in the United States. It is part of the National Fire Code series published by the National Fire Protection Association (NFPA), a private trade association. [1]
For example, types 3, 4 and 6 are intended for outdoor use, but type 5 is not. A NEMA enclosure rating does not mean that it also meets the same UL enclosure rating. [2] NFPA is National Fire Protection Association, and NEC is National Electrical Code (U.S.A.)
NEC was the main (title) sponsor of the Davis Cup competition until 2002, when BNP Paribas took over the sponsorship. [86] NEC between 1982 and 2012 sponsored the NEC Cup, a Go tournament in Japan. [citation needed] NEC between 1986 and 2003 sponsored the NEC Shun-Ei, a Go tournament for young players in Japan.
The system powers 226.6 miles (364.7 km) of the NEC between New York City [a] and Washington, D.C., [b] the entire 104-mile (167 km) Keystone Corridor, a portion of NJ Transit's North Jersey Coast Line (between the NEC and Matawan), along with the entirety of SEPTA's Airport, Chestnut Hill West, Cynwyd, and Media/Wawa lines.
The historical timeline of publication can be found within documents published by the IET, such as within the PDF detailing amendment 3 to the 18th edition ([8]), and is summarised below, along with some notable other events. Only major changes between editions/amendments are noted.
Unlike ATEX which uses numbers to define the safety "Category" of equipment (namely 1, 2, and 3), the IEC continued to utilise the method used for defining the safe levels of intrinsic safety namely "a" for zone 0, "b" for zone 1 and "c" for zone 2 and apply this Equipment Level of Protection to all equipment for use in hazardous areas since ...