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Emergency power
Normally, failures of electrical installations are sudden and so unexpected, that most often people who are affected by this problem do not have in store leads to a specific electrician who could quickly and efficiently remove the fault. In such cases it may refer to an electrical emergency, which most often work electricians with high seniority and professional experience in the repair of different faults. Repair of electrical installations often require even late at night, especially when this problem affects more people who, for example, live in the specified object. Electrical services, which provides, for example, emergency power can be ordered by phone.
Orders for electricians
Jobs electrician relies primarily on the installation of electrical equipment. Additional duties of the repair of electrical installations, but more often during the installation electricians team takes care of it to ensure the longest operating electricity networks in a specific object without intervention. Very often, electricians during the installation of their own select appropriate cables, and so on, and the role of the customer is limited to the financing of the project. This is due to the fact that the electrician with extensive experience certainly much better than the person selects the equipment which has no idea about electrical engineering.
About wires
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