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  2. NEMA connector - Wikipedia

    en.wikipedia.org/wiki/NEMA_connector

    NEMA 5-15P plug and NEMA 5-15R receptacle (different scales, blade spacing is 0.5 inches (12.7 mm) for both.) Each receptacle also accepts an ungrounded plug, whether polarized or unpolarized. Typical 5-15R residential receptacle 5-20R T-slot receptacle mounted with the hole for the ground pin at the top. The neutral connection is the wider T ...

  3. History of AC power plugs and sockets - Wikipedia

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

    Incidentally, a NEMA 5‐20, NEMA 6-15, or NEMA 6‐20 plug with a missing earth pin would fit this socket. This receptacle type has been unavailable at retail since the 1960s but still available from the manufacturer Leviton (model 5000-I) for replacement only, not for new installations and is not "UL listed". [23] Harvey Hubbell had patented ...

  4. Industrial and multiphase power plugs and sockets - Wikipedia

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

    Industrial devices may also be constructed to be dust or water-tight. NEMA wiring devices are made in current ratings from 15–60 A, and voltage ratings from 125–600 V. There are two basic configurations of NEMA plug and socket: straight-blade and locking. Numbers prefixed by L are twist-lock, others are straight blade. Locking type ...

  5. Harvey Hubbell - Wikipedia

    en.wikipedia.org/wiki/Harvey_Hubbell

    His best-known inventions are the U.S. electrical plug [1] and the pull-chain light socket. [2] In 1888, at the age of 31, Hubbell quit his job as a manager of a manufacturing company and founded Hubbell Incorporated in Bridgeport, Connecticut, a company which is still in business today, still headquartered near Bridgeport. Hubbell began ...

  6. AC power plugs and sockets - Wikipedia

    en.wikipedia.org/wiki/AC_power_plugs_and_sockets

    The generally used hybrid socket is also defined in TIS 166-2547, in addition to a plain three-round-pin socket, with plans to eventually replace the former and phase out support for NEMA-compatible plugs. Sockets are polarised (as in NEMA 5-15). [62] The grounded plug is similar to, but not interchangeable with, the Israeli SI32 plug.

  7. File:NEMA simplified pins.svg - Wikipedia

    en.wikipedia.org/wiki/File:NEMA_simplified_pins.svg

    Ground pins are all shown in the up direction. Reorienting 14-30 and 14-50 this way makes the diagram match most commercially available cables. Reorienting 5-15 is controversial because most residential installations use ground down, but many commercial or healthcare installations use ground up, and I'd like the diagram to be consistent.

  8. Power connector - Wikipedia

    en.wikipedia.org/wiki/Power_connector

    NEMA connector, the standard for much of the Americas and Japan for such plugs and sockets; Industrial power plug; DC connector, an electrical connector for supplying direct current (DC) power; Blade connector, commonly found in cars for quick connection of wiring to electrical components; IEC 60309 (BS 4343), so-called "Commando" plug and socket

  9. Three-prong adaptor - Wikipedia

    en.wikipedia.org/wiki/Three-prong_adaptor

    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]

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