This minor group comprises technical electrical trades, including electricians (except industrial and power system); industrial electricians; power system electricians; electrical power line and cable workers; telecommunications line and cable installers and repairers; and telecommunications equipment installation and cable television service technicians. They are employed by electrical contractors; maintenance departments of buildings, factories, plants, mines, shipyards and other industrial establishments; electric power generation, transmission and distribution companies and public utility commissions; cable and satellite television companies; and by telephone and other telecommunications services establishments; or they may be self-employed.