Electricians (except industrial and power system) lay out, assemble, install, test, troubleshoot and repair electrical wiring, fixtures, control devices and related equipment in buildings and other structures. They are employed by electrical contractors and maintenance departments of buildings and other establishments, or they may be self-employed. Apprentices are also included in this unit group.

Industrial electricians install, maintain, test, troubleshoot and repair industrial electrical equipment and associated electrical and electronic controls. They are employed by electrical contractors and maintenance departments of factories, plants, mines, shipyards and other industrial establishments. Apprentices are also included in this unit group.

Power system electricians install, maintain, test and repair electrical power generation, transmission and distribution system equipment and apparatus. They are employed by electric power generation, transmission and distribution companies. Apprentices are also included in this unit group.

Electrical power line and cable workers construct, maintain and repair overhead and underground electrical power transmission and distribution systems. They are employed by electric power generation, transmission and distribution companies, electrical contractors and public utility commissions. Apprentices are also included in this unit group.

Telecommunications line and cable installers and repairers install, repair and maintain telecommunication lines and cables, cable television transmission and distribution systems and associated hardware. They are employed by cable television, telephone and other telecommunications service companies. Apprentices are also included in this unit group.

Telecommunications equipment installation and cable television service technicians install, test, maintain and repair cable and satellite television, internet signal and associate equipment, telephones, telephone switching equipment and other telecommunications equipment related to transmission and processing of voice, video signals and other data over a variety of media including fibre optics, microwave, radio and satellite. They are employed by cable and satellite television, telephone and other telecommunications transmission service companies. Apprentices are also included in this unit group.