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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 connectors are found mostly in industrial applications and are not common in residential and light commercial use.
One apparent disadvantage of twist-lock connectors is that in the event that the cable is accidentally pulled too hard, rather than the plug falling out of the receptacle, exposed conductors may come out of the plug, causing dangerous shorts or shock hazards if the circuit is live.
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]
Hubbell (surname) Hubbell Center, the museum, library, and archive of the Hubbell family in North America; Hubbell Incorporated, an electric and electronic products manufacturer; Hubbell connector, see "Twist-Lock connector"
Harvey Hubbell II (born 1857, Connecticut) was an American inventor, entrepreneur, and industrialist. His best-known inventions are the U.S. electrical plug [ 1 ] and the pull-chain light socket . [ 2 ]
A twistlock or twist lock, together with matching corner castings, as defined in norms including ISO 1161:1984, form a standardized (rotating) connector system, for connecting and securing intermodal, and predominantly ISO-standard international shipping containers.
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