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The 14-30 has a rating of 30 A, and an L-shaped neutral blade. The 14-50 has a rating of 50 A, and a straight neutral blade sized so that it does not mate with 14-30 connectors. NEMA 14-50 devices are frequently found in RV parks, since they are used for "shore power" connections of larger recreational vehicles.
NEMA 5-20R outlets, which are similar to type B but have a T-shaped neutral slot, are sometimes used for higher current 120 V equipment (up to 20 A). Homes are typically provided with 120/240 V split-phase power; NEMA 14-30R and 14-50R receptacles are provided on 240 V circuits for clothes dryers and electric stoves. [19] Cape Verde: C, F 220 V ...
Ground pins are all shown in the up direction. Reorienting 14-30 and 14-50 this way makes the diagram match most commercially available cables. Reorienting 5-15 is controversial because most residential installations use ground down, but many commercial or healthcare installations use ground up, and I'd like the diagram to be consistent.
In 1930, the BS 196 standard for industrial plugs and sockets was introduced. The plugs are available in 5 A, 15 A and 30 A variants, with various configurations of keyways and pins to cater for different voltages. BS 196 plugs have now been superseded by BS 4343 connectors in most modern applications. [17]
The National Electrical Manufacturers Association (NEMA) [5] is the largest trade association of electrical equipment manufacturers in the United States. [6] Founded in 1926, it advocates for the industry and publishes standards for electrical products. Notably, the form of US household electrical outlets and plugs is specified by NEMA.
English: NEMA 14–30R and 14–50R split-phase receptacles. These differ only in shape of the neutral prong and in current rating (see NEMA 14-30 and 14-50 for more information). Clockwise from the top of each receptacle, the pin designations are: ground, live, neutral, live. Note: Anti-clockwise it's the very same!