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A distribution board (also known as panelboard, circuit breaker panel, breaker panel, electric panel, fuse box or DB box) is a component of an electricity supply system that divides an electrical power feed into subsidiary circuits while providing a protective fuse or circuit breaker for each circuit in a common enclosure.
The 1965 edition of the NEC, article 384-15 was the first reference to the circuit total limitation of panelboards. [1] As of 2008, the location of this language is at Article 408.54 now titled "Maximum Number of Overcurrent Devices."
An Eaton Corporation office building in Brossard, Quebec. Eaton Corporation plc is an American-Irish-domiciled [2] multinational power management company, with a primary administrative center in Beachwood, Ohio. [3] Eaton has more than 85,000 employees and sells products to customers in more than 175 countries. [4]
Below is a list of NEMA enclosure types; these types are further defined in NEMA 250- Enclosures for Electrical Equipment. Each type specifies characteristics of an enclosure, but not, for example, a specific enclosure size. Note that higher numbers do not include the lower-numbered tests. For example, types 3, 4 and 6 are intended for outdoor ...
No. 7/0, the largest size, is 0.50 in. (500 thou or 12.7 mm) dia., No. 1 is 0.30 in. (300 thou), and the smallest, No. 50, is 0.001 in. (1 thou or 25.4 µm). The system as a whole approximates an exponential curve, plotting diameter against gauge-number (each size is a approximately a constant multiple of the previous size). The weight per unit ...
NEMA (National Electrical Manufacturers Association) contactors and motor starters are rated by sizes. These sizes are grouped by rated current and power. [1] [2]
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