Transmission line can refer either to a single cable carrying electricity over a transmission system, or to the physical path travelled by electricity on its way from producer to consumer. Transmission line and distribution line are sometimes used interchangeably, but a distribution line is normally considered to be a line that carries less than 69,000 volts and is used to distribute power drawn from high-voltage transmission systems to end-use customers. Transmission lines may occasionally low voltage, notably lines used in networks that serve sparsely-populated areas.

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