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Variety of electrical contractors
Electrical contractors are generally classified by three major types of work performed.
"Outside" or "line" contractors are responsible for high-voltage power transmission and distribution lines. Line contractors build and maintain the infrastructure required to transport electricity generated at a power plant through a series of high-voltage lines and substations before it is used to power facilities, buildings, and homes.
"Inside" electrical contractors provide electricity to any structure within a property?s boundary lines, including outdoor lighting or substations. Under current construction specification guidelines, "inside" electrical contractors can serve as prime contractors for all electrical and cabling design, installation, and maintenance for commercial, institutional, and residential buildings. Projects also include Database Centers/Infrastructure and Pharmaceutical Work.
"Integrated building systems" (IBS) or "Voice/Data/Video" (VDV) electrical contractors work primarily with low-voltage installations such as back-up power, climate controls, wireless networks, energy-efficient lighting, telecommunications, fiber optics, and security systems. IBS contractors are particularly skilled at integrating these system controls to work together for maximum energy efficiency and building performance.
Źródło: https://en.wikipedia.org/wiki/Electrical_contractor
Wikipedia about responsibilities of electricians
The master electrician supervises and is responsible for all other electricians working on any construction or installation project. Only the master electrician can pull the permits with the electrical authority, and they can only be registered with one electrical contracting company at any one time. Other electrical duties performed by any electrician include:
Inventory and repair and maintenance of all lighting fixtures, cables, effects, power distribution, dimmers, networking and lighting control consoles.
Organization and purchasing of all consumables including color gel, gobos, Sharpies, and gaffer tape.
Planning and implementing of the cabling (circuiting) of lights and electric power distribution.
Documenting and tracking of all circuiting, addressing, and system configuration in cooperation with the Lighting Designer.
Patching assignments of the control console based on the paperwork generated by the lighting designer and the planned circuiting.
Occupational safety and health of workers and operational decisions as the head of the electrics department.
Źródło: https://en.wikipedia.org/wiki/Master_electrician
Wikipedia about wires and cables
Building wiring is the electrical wiring and associated devices such as switches, meters and light fittings used in buildings or other structures. Electrical wiring uses insulated conductors.
Wires and cables are rated by the circuit voltage, temperature and environmental conditions (moisture, sunlight, oil, chemicals) in which they can be used, and their maximum current. Wiring safety codes vary by country, and the International Electrotechnical Commission (IEC) is attempting to standardise wiring amongst member countries. Colour codes are used to distinguish line, neutral and earth (ground) wires.
Źródło: https://en.wikipedia.org/wiki/Electrical_wiring