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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.
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.
Why in many places it is still necessary to employ an electrician?
Although many people think that minor electrical repairs do not require the employment of a specialist such as a qualified electrician, the majority of jobs decides to offer a permanent job for an electrician. Why is this happening? Well, according to the law serious fault electrical installations may only be carried out by specialists. It is a profession of high risk and therefore must have the expertise to carry it out. In the absence of skills and knowledge of repair system can lead to severe injury or even a real tragedy.