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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.
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.
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.
BS 73:1915 is the original standard for 5 amp 2 pin plugs and sockets, superseded by BS 372.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 ...
GEC_Plug_and_Socket,_1893.jpg (187 × 265 pixels, file size: 42 KB, MIME type: image/jpeg) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
Companies using these plugs include Vernier, TI and Casio, for interfaces connecting to their graphical calculators, and in the Netherlands CMA. The BS 6312 specification defines the terminal numbering of a socket-outlet in the opposite direction to the pin numbers of the socket. Thus terminal 1 is connected to pin 6, terminal 2 to pin 5 and so on.
The plugs have openings on the sides that allow both the car and the charger to lock the plug automatically to prevent unwanted interruption of charging, or theft of the cable. As modified by Tesla for its European Supercharger network (up to Version 2), it is capable of outputting 150 kW using direct current (DC) via two pins each, with a ...
This plug-and-socket system is equivalent to the IEC "Plug Type D" system. [23] SANS 164-4: Dedicated System, 16 A 250 V [24] [25] These plugs and sockets, unique to South Africa, [2] are similar to the SANS 164-1 connectors, but have the earth pin flattened on one side to prevent conventional plugs from being inserted into dedicated sockets ...