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Three-prong plugs do not fit into the older, two-prong receptacles. [7] When used as intended, the ground pin of the 3-wire receptacle is to be connected to a grounded cover screw, or to an external ground. In 1969, Underwriters Laboratories mandated three-prong plugs on major appliances for safety. [7]
The addition is a 3 ⁄ 16-inch (4.8 mm) diameter round or U-shaped ground pin, 1 ⁄ 8 in (3.2 mm) longer than the power blades (so the device is grounded before the power is connected) and located from them by 1 ⁄ 4 in (6.4 mm) edge-to-edge or 15 ⁄ 32 in (11.9 mm) center-to-center.
Again, the three-phase power socket is compatible with single-phase plugs, either of 10 A or 16 A ratings: [55] The type 25 plug has three rectangular pins of the same dimensions as type 23, plus two rectangular pins of the same dimensions as type 15. The corresponding type 25 socket is recessed and will accept plugs of types 11, 12, 15, 21, 23 ...
Guide to Electrical Equipment for Travelers/Plug adapters; Guide to Electrical Equipment for Travelers/Printable version; Usage on en.wikivoyage.org Electrical systems; Usage on eo.wikipedia.org Konektingo; Usage on es.wikipedia.org Enchufe; Anexo:Enchufes, voltajes y frecuencias por país; Usage on fa.wikipedia.org بزرگراه بروس
This diagram shows the wiring of a British type G three pin plug. Externally it looks like this:en:Image:G plug.jpg: Date: 23 April 2011: Source: Traced from File:Three pin mains plug (UK).png: Author: Slashme: Other versions {Three pin mains plug (UK).png:
AC power plugs are also commonly circular, for example, Schuko plugs and IEC 60309. NMEA 2000 cabling using M12 connectors The M12 connector , specified in IEC 61076-2-101, is a circular electrical plug/receptacle pair with 12mm OD mating threads, used in NMEA 2000 , DeviceNet , IO-Link , some kinds of Industrial Ethernet , etc. [ 16 ] [ 17 ]
A receptacle tester for North American wiring. An electrical outlet tester, receptacle tester, or socket tester is a small device containing a 3-prong power plug and three indicator lights, used for quickly detecting some types of incorrectly-wired electrical wall outlets or campsite supplies.
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".