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Supports cars and RV’s with adapters such as (Tesla Roadster)
NEMA power plug connector standards are used for mains electricity in North America and other countries that conform to the standards set by the U.S. National Electrical Manufacturers Association.
The NEMA 14 devices are four-wire grounding devices (hot-hot-neutral-ground) available in ratings from 15 A to 60 A. Of the straight-blade NEMA 14 devices, only the 14–30 and 14–50 are common. The 14–30 is used for electric clothes dryers and the 14–50 for electric cooking ranges. The voltage rating is 250 V. They are essentially the replacements for the NEMA 10 connectors above with the addition of a separate grounding connection.
All NEMA 14 devices offer two hots, a neutral and a ground, allowing for both 120 V and 240 V (or 120 V and 208 V if the supply system is three-phase rather than split phase). 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 will not fit in the slot of a 14–30.
NEMA 14–50 devices are frequently found in RV parks, since they are used for shore power connections of larger recreational vehicles. Also, it was formerly common for mobile homes to be connected to utility power via a 14–50 device.
Wikipedia Entry: http://en.wikipedia.org/wiki/NEMA_connector#NEMA_14