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U.S. patent 774,250.The first US power plug and socket dated 1904. Several early American electrical plug and socket arrangements were invented by Harvey Hubbell.On 26 February 1903 he filed two patent applications featuring 2-pin plugs and adaptors for using his plugs with existing designs of lamp sockets and wall receptacles.
BS 4573 British Standard Specification for two-pin reversible plugs and shaver socket-outlets defines a plug for use with electric shavers. The pin dimensions are the same as those of the 5 A plug specified in the obsolete BS 372:1930 part 1 (as shown in the table above). [29]
Reconstruction included enhancements of landscaping, green infrastructure, irrigation, bollards, planters, LED street lighting, electrical outlets for holiday displays, benches, trash receptacles, bus shelters, mid-block crossings, way-finding signage, historic interpretive panels, shared-use pathways, and sidewalks.
Single-phase sockets have receptacles for two power pins, one to carry the electrical current from the power source to the connected device (called live, line, or phrase pin) and another one to carry it back to the power source (called neutral pin). Many sockets have a third receptacle or pin for a safety connection to earth ground.
NEMA 1-15P (two-pole, no ground) and NEMA 5-15P (two-pole with ground pin) plugs are used on common domestic electrical equipment, and NEMA 5-15R is the standard 15-ampere electric receptacle (outlet) found in the United States, and under relevant national standards, in Canada (CSA C22.2 No. 42 [1]), Mexico (NMX-J-163-ANCE) and Japan (JIS C 8303).
One of the most successful and familiar today, was the duplex receptacle which is still found everywhere that electrical power is used. In 1901, Hubbell published a 12-page catalogue that listed 63 electrical products of his company's manufacture, and four years later he incorporated his enterprise as Harvey Hubbell, Incorporated.