Some plug/socket combinations are designed in a way that a plug can be inserted only one possible way - this is referred to as a polarized plug (not to be confused with positive and negative polarity). In some installations, there may be two live conductors, either being two phases from a three-phase system or being both phases from a split phase system. The voltage varies by country, as set by national standards. The live contact (also known as phase, hot or active) carries alternating current from the power source to the equipment. Many plugs and sockets include a third contact used for a protective earth ground, which only carries current in case of a fault in the connected equipment. In most countries, household power is single-phase electric power, in which a single live conductor brings alternating current into a house, and a neutral returns it to the power supply. Note: the colours in this table represent the most common and preferred standard colours however others may be in use, especially in older installations.
Green & yellow (core is usually bare and should be sleeved at terminations) Some sockets have one or more pins that connect to holes in the plug.ĮU, Australia & South Africa ( IEC 60446)ĮU ( IEC 60446) including UK from 31 March 2004 Sockets are usually designed to reject any plug which is not built to the same electrical standard.
Power sockets are female electrical connectors that have slots or holes which accept the pins or blades of power plugs inserted into them and deliver electricity to the plugs. The contacts may be brass, tin or nickel plated. Many plugs make no distinction between the live and neutral contacts, and in some cases they have two live contacts. Plugs usually have a live or hot contact, a neutral contact, and an optional earth or ground contact. They have contacts that are pins or blades which connect mechanically and electrically to holes or slots in the socket. Power plugs are male electrical connectors that fit into female electrical sockets. For less common plugs and sockets see unusual and obsolete plugs and sockets.ĭomestic AC power plugs and sockets are devices that connect the home appliances and portable light fixtures commonly used in homes to the commercial power supply so that AC electric power can flow to them. For plugs and sockets used for industrial applications, or with more than two current carrying conductors, see Industrial & multiphase power plugs & sockets. This article covers only plugs and sockets intended for common domestic use.
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