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Electricians were originally people who demonstrated or studied the principles of electricity, often electrostatic generators of one form or another. [2]In the United States, electricians are divided into two primary categories: lineperson, who work on electric utility company distribution systems at higher voltages, and wiremen, who work with the lower voltages utilized inside buildings.
Lineworkers repairing electricity distribution lines that supply power to homes. A lineworker (also called a lineman or powerline worker) constructs and maintains the electric transmission and distribution facilities that deliver electrical energy to industrial, commercial, and residential establishments.
An electrical contractor is a business person or firm that performs specialized construction work related to the design, installation, and maintenance of electrical systems. [1]
The most common residential and small commercial service in Canada and the U.S., single split-phase, 240 V, features a neutral and two hot legs, 240 V to each other, and 120 V each to the neutral. The most common three-phase system will have three hot legs, 208 V to each other and 120 V each to the neutral.
They must also resist corrosion caused by salt water or salt spray, which is accomplished through the use of thicker, specially constructed jackets, and by tinning the individual wire stands. US single-phase residential power distribution transformer, showing the two insulated line conductors and the bare neutral conductor (derived from the ...
A unit (US) A BNSF Railway A unit A diesel locomotive (or more rarely an electric locomotive) equipped with a driving cab and a control system to control other locomotives in a multiple unit, and therefore able to be the lead unit in a consist of several locomotives controlled from a single position [9]
A four layer semiconductor switching device that can stand off an applied voltage until triggered by an electrical pulse on a control lead. Silicon Valley Initially, a region of California known for a large number of electronics technology firms. sine wave The waveform of the mathematical sine function; a fundamental wave shape, free of harmonics.
The O*NET system varies from the DOT in a number of ways. It is a digital database which offers a "flexible system, allowing users to reconfigure data to meet their needs" as opposed to the "fixed format" of the DOT; it reflects the employment needs of an Information society rather than an Industrial society; costs the government and users much less than a printed book would, and is easier to ...