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These can be flush-mount fixtures mounted into the ceiling, or semi-flush fixtures separated by a small distance (usually about 3–12"). Open ceiling dome – the translucent dome is suspended a short distance below the ceiling by a mechanism that is hidden with the exception of a screw-knob or other device appearing on the outer dome face ...
The electrical components and wires must be designed to carry the intended current plus a safety factor. The contact surface area, thickness and conductivity of the metal, connection methods and maximum operating temperature must all be considered in the design of a new socket.
Wiring devices such as light switches, receptacle outlets, and lamp sockets were either surface-mounted, suspended, or flush-mounted within walls and ceilings. Only in the last case were metal boxes always used to enclose the wiring and device.
The term "flush box" is used for a mounting box that goes inside the wall, although some use the term "wall box". Boxes for installation within timber or plasterboard walls are usually called "cavity boxes" or "plasterboard boxes". A ceiling-mounted pattress (most often used for light fixtures) is referred to as a "ceiling pattress" or "ceiling ...
The International Electrotechnical Commission publishes IEC 60050, the International Electrotechnical Vocabulary. [2]Generally the plug is the movable connector attached to an electrically operated device's mains cable, and the socket is fixed on equipment or a building structure and connected to an energised electrical circuit.
Cartridge fuses and fuse block, lamp holders, key sockets, soon followed the same path Later, Hubbell's "separable plug" design took shape on the drawing board back in Bridgeport, and then submitted to the patent office in Washington, D.C. Additional designs based on that basic concept separable plugs in different configurations, a single flush ...
The history of electric light is well documented, [11] and with the developments in lighting technology the profession of lighting developed alongside it. The development of high-efficiency, low-cost fluorescent lamps led to a reliance on electric light and a uniform blanket approach to lighting, but the energy crisis of the 1970s required more design consideration and reinvigorated the use of ...
Hubbell's first design was a socket which screwed into a lampholder (like the early lampholder plugs), but with a separable plug with pins (U.S. patent 774,250) or blades (US patent 774251). The 1906 Hubbell catalog [4] shows the blade plug with a flush mounting socket for use in wall or floor. Other manufacturers adopted the Hubbell pattern ...