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The 5-20R receptacle has a T-shaped neutral hole, to accept both 5-15P and 5-20P plugs. An acceptable alternative version of the 5-20R receptacle has a rectangular slot that will only accept 5-20P plugs. The 5-30 and 5-50 are physically larger, with 1 in (25.4 mm) between power pins; 5-30 also has an L-shaped neutral blade. [17]
Because the breaker rating is much higher than that of any one socket outlet, the system can only be used with fused plugs or fused appliance outlets. They are generally wired with 2.5 mm 2 cable and protected by a 30 A fuse, an older 30 A circuit breaker, or a European harmonised 32 A circuit breaker.
For example, there is one group that consists of 32 A, 40 A and 50 A connectors, and another group of 50 A, 63 A and 80 A connectors. The 32 A plug can be connected to any of the 32 A, 40 A or 50 A sockets in the first group, however it cannot be connected to any of the 50 A, 63 A or 80 A sockets in the second group.
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.
Main electrical distribution room in a large building. The back of an antique electrical room, still operational at a US plant as of 2014. All conducting busbars are open and operators must be careful not to touch them. An electrical room is a technical room or space in a building dedicated to electrical equipment. Its size is usually ...
In Italy, CEI 23-50 is the dominant standard and it also includes Schuko sockets (P 30 = CEE 7/3) and plugs (S 30 = CEE 7/4, S 31 = CEE 7/7, S 32 = CEE 7/17). Appliances are commonly sold with Schuko-type plugs (as well as Europlugs ), while Italian-type plugs have become rare today and almost only power strips, cable reels and adaptors are ...