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Industrial outlets may have weatherproof covers, waterproofing sleeves, or may be interlocked with a switch to prevent accidental disconnection of an energized plug. Some types of connectors are approved for hazardous areas such as coal mines or petrochemical plants, where flammable gas may be present.
Special purpose sockets may be found in residential, industrial, commercial or institutional buildings. Examples of systems using special purpose sockets include: "Clean" (low electrical noise) earth for use with computer systems, Device for Connection of Luminaires (DCL) is a European standard for ceiling- and hanging light fixtures.
A red receptacle may indicate a special-service outlet such as one connected to an emergency standby power source. The Canadian Electrical Code requires that "essential" receptacles in hospitals, connected to emergency power systems, must be red. [43] At least one manufacturer makes a yellow receptacle, which identifies it as corrosion-resistant.
IEC 60309 (formerly IEC 309 and CEE 17, also published by CENELEC as EN 60309) is a series of international standards from the International Electrotechnical Commission (IEC) for "plugs, socket-outlets and couplers for industrial purposes".
Gangbox (also gang box) is a colloquial term utilized in the construction industry, referring to a toolbox or workbox that can be accessed by multiple workers.. A gang box is a type of electrical box or junction box in building materials, which is a purpose-built enclosures that serve as a centralized hub for housing and organizing multiple electrical devices, such as switches, outlets, or ...
The special plugs are preferred for test equipment and adapters, which may be rapidly connected to a large number of corresponding connectors in quick succession for testing purposes. The use of the special plugs avoids inadvertent damage to the equipment under test, even when a narrower plug is inserted into a nominally incompatible wider jack.
Dual 3-pin socket-outlet construction Switched dual 3-pin socket-outlet Socket-outlet, using insulation displacement as a means of connecting to low voltage (230 V) supply conductors AS/NZS 3112 compliant plugs have two flat pins forming an inverted V-shape plus a vertical earthing pin.
CEE 7 is a standard for alternating-current plugs and sockets.First published in 1951 by the former International Commission on the Rules for the Approval of Electrical Equipment (), it unified standards produced by several continental European countries.