Electrical wiring

"Wiring" redirects here. Not to be confused with Wiring (software).
This article is about building wiring. For power distribution, see Electric power transmission and Electric power distribution.
For broader coverage of this topic, see Electrical cabling.
For wiring colours, see Electrical code.

Electrical installations
Wiring practice by region or country
Regulation of electrical installations
Cabling and accessories
Switching and protection devices
Electrical symbols for wiring[vague]

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 specifications. Wiring safety codes vary by locality, country, or region. The International Electrotechnical Commission (IEC) is attempting to harmonise wiring standards among member countries, but significant variations in design and installation requirements still exist.