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  2. 3-way lamp - Wikipedia

    en.wikipedia.org/wiki/3-way_lamp

    A 3-way lamp, also known as a tri-light, is a lamp that uses a 3-way light bulb to produce three levels of light in a low-medium-high configuration. A 3-way lamp requires a 3-way bulb and socket, and a 3-way switch. In 3-way incandescent light bulbs, each of the filaments operates at full voltage. Lamp bulbs with dual carbon filaments were ...

  3. Multiway switching - Wikipedia

    en.wikipedia.org/wiki/Multiway_switching

    The "California 3-way" or "Coast 3-way" connection never connects the lamp socket shell to the line (hot) terminal. An optional additional lamp can be connected at Terminal A as a pilot lamp, or to illuminate a long corridor. An optional receptacle can be connected at Terminal B, since that terminal is always live. Comparison of the traveler (1 ...

  4. Electrical wiring - Wikipedia

    en.wikipedia.org/wiki/Electrical_wiring

    The first rubber-insulated cables for US building wiring were introduced in 1922 with US patent 1458803, Burley, Harry & Rooney, Henry, "Insulated electric wire", issued 1923-06-12, assigned to Boston Insulated Wire and Cable . These were two or more solid copper electrical wires with rubber insulation, plus woven cotton cloth over each ...

  5. Underwriter's knot - Wikipedia

    en.wikipedia.org/wiki/Underwriter's_knot

    The knot is typically used as a stopper knot where a lamp or appliance cord passes through a hole or slot of a plug or socket. Its purpose is to "reduce strain on the screw terminal connections—where the metal parts of the wires connect to the socket or plug—and prevent the wires from pulling free." [4]

  6. DIN 72552 - Wikipedia

    en.wikipedia.org/wiki/DIN_72552

    charge indicator (charge control light) B+ battery + 51, 51B+, B+30, B+51 B- battery - 31B- D+ dynamo/alternator diode+ D- dynamo/alternator diode- DF dynamo field DF1 dynamo field 1 DF2 dynamo field 2 U, V, W AC three phase terminals Lights 54 brake lights 54g lights 54 55 fog light N 56 spot light 56a headlamp high beam and indicator light 56b

  7. NEMA connector - Wikipedia

    en.wikipedia.org/wiki/NEMA_connector

    NEMA connectors are power plugs and sockets used for AC mains electricity in North America and other countries that use the standards set by the US National Electrical Manufacturers Association. NEMA wiring devices are made in current ratings from 15 to 60 amperes (A), with voltage ratings from 125 to 600 volts (V).

  8. Wiring diagram - Wikipedia

    en.wikipedia.org/wiki/Wiring_diagram

    An automotive wiring diagram, showing useful information such as crimp connection locations and wire colors. These details may not be so easily found on a more schematic drawing. A wiring diagram is a simplified conventional pictorial representation of an electrical circuit. It shows the components of the circuit as simplified shapes, and the ...

  9. Lightbulb socket - Wikipedia

    en.wikipedia.org/wiki/Lightbulb_socket

    A lightbulb socket, lightbulb holder, light socket, lamp socket or lamp holder is a device which mechanically supports and provides electrical connections for a compatible electric lamp base. [1] Sockets allow lamps to be safely and conveniently replaced (re-lamping).