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In all versions with three or five contact pins (Types 12/13, 15, 23 and 25) the middle pole is the protective contact. Although the contact pins are of the same length, the protective contact is in advance because the sockets for the neutral conductor and phase conductor(s) are sunk deeper in the socket.
BS 546, Two-pole and earthing-pin plugs, socket-outlets and socket-outlet adaptors for AC (50–60 Hz) circuits up to 250 V is an older British Standard for three-pin AC power plugs and sockets: four sizes with current capacities from 2 A to 30 A. Originally published in April 1934, it was updated by a 1950 edition which is still current, [1 ...
This allows one to choose single-phase AC power at either 110–120 volts between phase and neutral or 220–240 volts between phase and phase. Since these two modes do not need three phases there is also a dark yellow-orange four-pin connector available designed for a single-phase 110–120 or 220–240 volt load.
The Type 2 connector has a maximum power output for 43 kW and can handle both single-, dual- and three-phase AC power. The IEC 62196-2 Type 1 connector (codified under SAE J1772) is the corresponding standard for single-phase AC charging in the United States, Canada, and South Korea. [12] J1772 has a maximum output of 19.2 kW. [13]
Semko 17 were 3/4-pin 3-phase connectors, with (4-pin) or without (3-pin) a neutral connector. Earth were provided via the shield. The connectors were available in different sizes, 16 A with rounded corners; 25 A and 63 A were rectangular. These connectors were used mainly in industrial and agricultural installations.
The numerals preceding the hyphen encode the number of poles (current-carrying terminals) and wires connected to it, the voltage, and single- or three-phase power. [citation needed] A connector with ground terminal has more wires than poles: two-pole, three-wire; or four-pole, five-wire; etc.
The socket is rectangular, with lateral key pins and indentations to maintain polarisation, and to prevent insertion of a plug with different current ratings. Three single-phase general purpose connectors were rated 10 A, 16 A and 20 A; and a three-phase industrial connector rated 10 A; all of them have different key-pin positioning so plugs ...
Given that a 480Y/277 VAC three-phase wye-connected four-wire supply is a common configuration supplied by utilities at commercial locations – under SAE J3400 and SAE J3068 the implied higher rating is taken; thus allowing single-phase charging at 277 VAC nominal for North American application.
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