![]() The first light switch employing "quick-break technology" was invented by John Henry Holmes in 1884 in the Shieldfield district of Newcastle upon Tyne. The switch box is covered by a decorative plate. The switch on the right is a dimmer switch. History, culture, examples, and style Two light switches in one box. These covers are usually quite easy to mount. Wall plates are available in different styles and colours to blend in with the style of a room, also available in weatherproof varieties for outdoors. Each kind uses some form of a plastic, ceramic, or metal cover to prevent accidental contact with live terminals of the switch. These light switch boxes (a pattress box) are designed to house and mount the switch(s), protect the wiring and contain any heat or fire. Surface mounting of enclosures is also fairly common though is seen more in commercial industrial and outbuilding settings than in residential structures. The switch mounting boxes, or enclosures are often recessed within a finished wall. Mounting height, visibility, and other design factors vary from country to country. Residential and commercial buildings usually have wall-mounted light switches to control lighting within a room. Switches for lighting may be in hand-held devices, moving vehicles, and buildings. Light switches are also found in flashlights, vehicles, and other devices. Manually operated on/off switches may be substituted by dimmer switches that allow controlling the brightness of lamps as well as turning them on or off, time-controlled switches, occupancy-sensing switches, and remotely controlled switches and dimmers. ![]() Portable lamps such as table lamps may have a light switch mounted on the socket, base, or in-line with the cord. ![]() In electrical wiring, a light switch is a switch most commonly used to operate electric lights, permanently connected equipment, or electrical outlets. ![]() This "double gang" (two unit) installation uses non-metallic-sheathed cable and twist-on wire connectors. Shown here will be fastened to this recessed, non-metallic box, then a cover plate is installed. Type of switch in electrical wiring Two decorator-style rocker switches and wiring (often called "Decora switches", after the trademarked Leviton switches ), as installed in the United States. ![]()
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