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These sockets and plugs are four prong (see receptacle chart above) grounding devices (hot–hot–neutral–ground) available in ratings from 15 to 60 A. The voltage rating is 250 V. Of the straight-blade NEMA 14 devices, only 14-50 and 14-30 are in common use and either may be used for home charging of electric vehicles .
Power cord, with plug at end, plugged into a Japanese outlet with ground post, for a washing machine. North American power cord with IEC 60320 C13 appliance connector and NEMA 5-15 wall plug. A power cord , line cord , or mains cable is an electrical cable that temporarily connects an appliance to the mains electricity supply via a wall socket ...
In some designs, polarised plugs cannot be mated with non-polarised sockets. In NEMA 1 plugs, for example, the neutral blade is slightly wider than the hot blade, so it can only be inserted one way. Wiring systems where both circuit conductors have a significant potential with respect to earth do not benefit from polarised plugs.
The neutral wire is identified by gray or white insulated wire, perhaps using stripes or markings. With lamp cord wire the ribbed wire is the neutral, and the smooth wire is the hot. NEC 2008 400.22(f) allows surface marking with ridged, grooves or white stripes on the surface of lamp cord. With transparent cord the hot wire is copper colored ...
The standards of China and Argentina also use the Type I plug and socket, though the live (active) and neutral pins are swapped in Argentina, and neither includes insulation on these prongs. In both countries the voltage is 220 V, and the outlet is mounted upside-down with the earth pin at the top for safety.
Diagram showing positive tip polarity on the left and negative tip polarity on the right. To read diagram: The center positive drawing on the left indicates that the center (also known as the tip) of the output plug is positive (+) and the barrel (ring) of the output plug is negative (−). Center positive symbol Center negative symbol
Three-phase electric motors do not need the neutral wire to function, so that there is also a red four pin variant (3 phases and earth) of the IEC 60309 plugs for three phase power. The two styles are not intermatable, to prevent a potential floating neutral.
Neutral is a circuit conductor that normally completes the circuit back to the source. NEC states that the neutral and ground wires should be connected at the neutral point of the transformer or generator, or otherwise some "system neutral point" but not anywhere else. [1]