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External pattress boxes: power and data sockets. A pattress or pattress box or fitting box (in the United States and Canada, electrical wall switch box, electrical wall outlet box, electrical ceiling box, switch box, outlet box, electrical box, etc.) is the container for the space behind electrical fittings such as power outlet sockets, light switches, or fixed light fixtures.
Amended (no. 1) and reprinted in 2011 (green cover), amended (no. 2) Aug 2013, amended (no. 3) and reprinted 2015 (yellow cover). Amendment 1 replaced Periodic inspection reports (PIRs) with Electrical Installation Condition Reports (EICRs), a section on surge protection devices (SPDs) was introduced, and some details relating to medical ...
Left: a typical moulded BS 1363 plug, showing the fuse access from the underside of the plug. Right: a typical rewireable plug (before installation); the large central screw releases the cover, allowing access to the terminals and also the fuse; the two smaller screws secure an internal strain relief bar. BS546 plug and socket
NEMA 1-15P (two-pole, no ground) and NEMA 5-15P (two-pole with ground pin) plugs are used on common domestic electrical equipment, and NEMA 5-15R is the standard 15-ampere electric receptacle (outlet) found in the United States, and under relevant national standards, in Canada (CSA C22.2 No. 42 [1]), Mexico (NMX-J-163-ANCE) and Japan (JIS C 8303).
Diagram of a possible configuration of ring final circuit. Consumer unit is at bottom left. The ring starts at the consumer unit (also known as fuse box, distribution board, or breaker box), visits each socket in turn, and then returns to the consumer unit. The ring is fed from a fuse or circuit breaker in the consumer unit.
An outlet is defined by the NEC as "a point in the wiring system at which current is taken to utilization equipment". [1] This definition includes receptacles, lighting, motors, etc. Ordinary switches control but do not consume electricity, and therefore are not defined as outlets in this sense.
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The International Electrotechnical Commission (IEC) maintains a guide with letter designations for generally compatible types of plugs, [7] which expands on earlier guides published by the United States Department of Commerce. This is a de facto naming standard and guide to travellers. Some letter types correspond to several current ratings or ...
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