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2. NEMA connector - Wikipedia

   en.wikipedia.org/wiki/NEMA_connector

   L21-30 plug and receptacle. NEMA L21 are four-pole and ground connectors rated for 120/208 V. Intended for wye three-phase circuits with both neutral and ground. The pin in the middle is ground, and the blade with a right angle on the tab is neutral. These connectors are common in live event power distribution.

3. AC power plugs and sockets - Wikipedia

   en.wikipedia.org/wiki/AC_power_plugs_and_sockets

   BS 546, "Two-pole and earthing-pin plugs, socket-outlets and socket-outlet adaptors for AC (50-60 Hz) circuits up to 250 V" describes four sizes of plug rated at 2 A, 5 A (Type D), 15 A (Type M) and 30 A. The plugs have three round pins arranged in a triangle, with the larger top pin being the earthing pin.

4. IEC 60309 - Wikipedia

   en.wikipedia.org/wiki/IEC_60309

   IEC 60309 (formerly IEC 309 and CEE 17, also published by CENELEC as EN 60309) is a series of international standards from the International Electrotechnical Commission (IEC) for "plugs, socket-outlets and couplers for industrial purposes".

5. AC power plugs and sockets: British and related types

   en.wikipedia.org/wiki/AC_power_plugs_and_sockets:...

   In the United Kingdom and in Ireland, this system is usually referred to simply as a "13 amp plug" or a "13 amp 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.

6. Industrial and multiphase power plugs and sockets - Wikipedia

   en.wikipedia.org/wiki/Industrial_and_multiphase...

   30 A 208Y/120 V L21-30 receptacle L21-30 plug. ... rated at 20 A, IP56. Single-phase dual 10 Amp Australian socket outlets are seen in the background.

7. History of AC power plugs and sockets - Wikipedia

   en.wikipedia.org/wiki/History_of_AC_power_plugs...

   U.S. patent 774,250.The first US power plug and socket dated 1904. Several early American electrical plug and socket arrangements were invented by Harvey Hubbell.On 26 February 1903 he filed two patent applications featuring 2-pin plugs and adaptors for using his plugs with existing designs of lamp sockets and wall receptacles.