This types of electrical wires and their uses pdf is about building wiring. For power distribution, see Electric power transmission and Electric power distribution.
Electrical wiring is an electrical installation of cabling and associated devices such as switches, distribution boards, sockets and light fittings in a structure. Wiring is subject to safety standards for design and installation. Allowable wire and cable types and sizes are specified according to the circuit operating voltage and electric current capability, with further restrictions on the environmental conditions, such as ambient temperature range, moisture levels, and exposure to sunlight and chemicals. Associated circuit protection, control and distribution devices within a building’s wiring system are subject to voltage, current and functional specification.
Wiring safety codes vary by locality, country or region. Wiring installation codes and regulations are intended to protect people and property from electrical shock and fire hazards.
NZS 3000 standard, commonly known as the “wiring rules”, specifies requirements for the selection and installation of electrical equipment, and the design and testing of such installations. In European countries, an attempt has been made to harmonise national wiring standards in an IEC standard, IEC 60364 Electrical Installations for Buildings. Hence national standards follow an identical system of sections and chapters.
However, this standard is not written in such language that it can readily be adopted as a national wiring code. Neither is it designed for field use by electrical tradesmen and inspectors for testing compliance with national wiring standards. By contrast, national codes, such as the NEC or CSA C22. 1, generally exemplify the common objectives of IEC 60364, but provide specific rules in a form that allows for guidance of those installing and inspecting electrical systems.