An electrical wire, cable or conduit, suspended in air by utility poles or transmission towers, or buried underground, used for the carrying of electricity either from a power source such as a generating station to a substation, or from a substation to a building such as a plant, commercial building or a home
A power line is a cable, especially above ground, along which electricity is passed to an area or building. a large wire carrying electricity above or under the ground
To Echelon, the power line is a physical media that LonWorks networks can communicate over The existing power wiring in your building, factory or home can be used as network wire by a LonWorks network