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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.
Early GEC 2-pin plug and socket as depicted in the 1893 GEC catalogue. The earliest domestic plug and socket is believed to be that patented by T. T. Smith in 1883. [27] This was shortly followed by patents from W. B. Sayers and G. Hookham; these early designs had rectangular plugs with contact plates on either side.
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.
The plug will fit into the 16 A variety of the C 1 socket, but will not be grounded. C 4: CEE 7/7 16 A This is the compromise plug designed to be accepted and to be grounded in both the Schuko and French sockets. The plug will fit into the 16 A variety of the C 1 socket, but will not be grounded. C 5: CEE 7/16 Europlug 2.5 A (Type C)
BS 73:1915 is the original standard for 5 amp 2 pin plugs and sockets, superseded by BS 372. The correct place for old British 2 pin plug information is probably AC power plugs and sockets in a new sub-section under "Obsolete Types", and I propose to start that. Based on the poor quality and inappropriateness of the current paragraph in BS 546 ...
Created Date: 8/30/2012 4:52:52 PM
Wake Forest transfer Boopie Miller had 21 points for SMU (11-3, 2-1), which saw its seven-game winning streak snapped. Samet Yigitoglu, a 7-foot-2 freshman from Istanbul, had 10 points and 13 ...
Schuko sockets can accept two-pin unearthed Europlug (CEE 7/16) and CEE 7/17. Less safely, Schuko plugs can be inserted into many two-pin unearthed CEE 7/1 sockets and into some sockets with a different form of earth connection that will not mate with the earth contacts on the Schuko plug (e.g., some variants of the Danish socket).