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Edward F. Caldwell, a portrait painter originally from Waterville, New York, became part of an active community of designers in New York City during the early 1880s.By the end of that decade and into the 1890s, Caldwell worked for, and later became chief designer and vice president of, the Archer & Pancoast Manufacturing Company of New York, top designers of gas lighting fixtures.
Wiring devices such as light switches, receptacle outlets, and lamp sockets were either surface-mounted, suspended, or flush-mounted within walls and ceilings. Only in the last case were metal boxes always used to enclose the wiring and device.
The parallel and tandem socket accepts normal parallel NEMA 1‐15 plugs and also tandem NEMA 2‐15 plugs. Both pairs of sockets are fed internally by the same supply. A more recent and fairly common version of this type is the T-slot socket, in which the locations of the tandem and the parallel slots were combined to create T-shaped slots.
Chinese dual sockets have both an unearthed socket complying with figure 5 of GB 1002-2008 (both flat pin and 4.8 mm round pin), and an earthed socket complying with figure 4 of GB 1002-2008. Both Thai and Chinese dual sockets also physically accept plugs normally fitted to 120 V appliances (e.g. 120 V rated NEMA 1-15 ungrounded plugs).
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 ...
One product, the Multy Kontact spring grip socket (3-pin plug), soon became a market leader and the British Engineering Standards Association (BESA) changed standards to adopt this new product. By 1923 demand for these new products was growing rapidly and new production facilities were built in Edmonton, Middlesex .
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