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The United States National Electrical Code (NEC) specifies minimum acceptable wiring methods and materials for many states and municipalities. [2] It is sponsored by the National Fire Protection Association (NFPA) and has been periodically revised since 1897. Local jurisdictions usually adopt the NEC or another published code and then ...
Created tax incentives for electric vehicles. Extended and modified renewable energy tax incentives and defined electricity as a clean fuel. 2009 American Recovery and Reinvestment Act of 2009: Provided funding for an electric smart grid. Created and modified renewable energy tax cuts. Weatherized modest-income homes.
In the United States [13] [14] and Canada, [15] national standards specify that the nominal voltage at the source should be 120 V and allow a range of 114 V to 126 V (−5% to +5%). Historically, 110 V, 115 V and 117 V have been used at different times and places in North America.
1937 poster celebrating the United States' first foreign trade zone, Staten Island In the United States, a foreign-trade zone (FTZ) is a geographical area, in (or adjacent to) a United States port of entry, where commercial merchandise, both domestic and foreign, receives the same Customs treatment it would if it were outside the commerce of the United States.
WASHINGTON (Reuters) -U.S. single-family homebuilding increased to a 10-month high in December, indicating that construction activity regained some momentum at the end of the year, though rising ...
The waveform of 230 V and 50 Hz compared with 120 V and 60 Hz. The utility frequency, (power) line frequency (American English) or mains frequency (British English) is the nominal frequency of the oscillations of alternating current (AC) in a wide area synchronous grid transmitted from a power station to the end-user.
Title 47 CFR Part 68 is a section of the Code of Federal Regulations of the United States that regulates the direct electrical connection of telecommunications equipment and customer premises wiring with the public switched telephone network, certain private line services, and connection of private branch exchange (PBX) equipment to certain telecommunication interfaces.
Unlike a linear power supply, the pass transistor [a] of a switching-mode supply continually switches between low-dissipation, full-on and full-off states, and spends very little time in the high-dissipation transitions, which minimizes wasted energy. Voltage regulation is achieved by varying the ratio of on-to-off time (also known as duty ...