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  2. 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 ...

  3. 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 ...

  4. Harvey Hubbell - Wikipedia

    en.wikipedia.org/wiki/Harvey_Hubbell

    Hubbell received at least 45 patents, [3] most of which were for electric products. The pull-chain electrical light socket was patented in 1896, and his most famous invention, the U.S. electrical power plug, in 1904. It allowed the adoption in the U.S. of convenient, portable electrical devices, which Great Britain had enjoyed since the early ...

  5. Hubbell Incorporated - Wikipedia

    en.wikipedia.org/wiki/Hubbell_Incorporated

    Hubbell Incorporated was founded as a proprietorship in 1888 by Harvey Hubbell II. Born in Connecticut in 1857, he was a U.S. inventor, entrepreneur, and industrialist. Hubbell's best-known inventions are the U.S. electrical plug [3] and the pull-chain light socket. [4]

  6. 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]

  7. AS/NZS 3112 - Wikipedia

    en.wikipedia.org/wiki/AS/NZS_3112

    [5] [6] The design was based on an American plug and socket-outlet first intended for use at 120 V which was patented in 1916 under U.S. patent 1,179,728 by Harvey Hubbell. [7] By the early 1930s this design had been up-rated to 250 V 10 A capacity and Hubbell had supplied the Australian electrical industry with his sockets. [ 8 ]

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