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Zinsco would remain with copper in both their panels and breakers until the third major copper shortage in the early 1960s, when they would switch to an aluminum bus. In 1963, Zinsco introduced the R-38 twin breaker, which was the only twin circuit breaker that also made contact on both bus-bars for 240 volts in a single breaker space.
Cable car on Broadway just north of 2nd Street looking south, Los Angeles, c. 1893–1895 Above image zoomed out, Los Angeles, c. 1893–1895 The Women's Christian Temperance Union building, also known as Temperance Temple, at Temple and Fort (now Broadway) streets, with a Temple Street Cable Railway car, 1890
Craigslist headquarters in the Inner Sunset District of San Francisco prior to 2010. The site serves more than 20 billion [17] page views per month, putting it in 72nd place overall among websites worldwide and 11th place overall among websites in the United States (per Alexa.com on June 28, 2016), with more than 49.4 million unique monthly visitors in the United States alone (per Compete.com ...
The busbar's material composition and cross-sectional size determine the maximum current it can safely carry. Busbars can have a cross-sectional area of as little as 10 square millimetres (0.016 sq in), but electrical substations may use metal tubes 50 millimetres (2.0 in) in diameter or more as busbars.
Feeder busway is used to interconnect equipment, such as between a transformer and a switchgear line up. A variant type is a low-impedance busway, which is designed to have lower voltage drop by virtue of close spacing of bus bars, which reduces inductive reactance. A trolley busway provides power to equipment that must be frequently moved.
Flanked by members of the Los Angeles Police Department and Caltrans, City Council President Paul Krekorian announced that 16,000 pounds of copper wire valued at $40,000 has been recovered during ...