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  2. Light switch - Wikipedia

    en.wikipedia.org/wiki/Light_switch

    Mercury light switch from General Electric c. 1960, 120 V 15 A. Around the middle of the 20th century, "quiet" switches were introduced that used mercury to make the connection, avoiding the loud snap made by the spring-loaded toggle switches that were then the norm.

  3. Multiway switching - Wikipedia

    en.wikipedia.org/wiki/Multiway_switching

    In building wiring, multiway switching is the interconnection of two or more electrical switches to control an electrical load from more than one location.A common application is in lighting, where it allows the control of lamps from multiple locations, for example in a hallway, stairwell, or large room.

  4. Switch - Wikipedia

    en.wikipedia.org/wiki/Switch

    A toggle DIP switch with four inputs and outputs Bank of toggle switches on a Data General Nova minicomputer front panel Toggle switches with the shared cover preventing certain forbidden combinations. A toggle switch or tumbler switch is a class of electrical switches that are manually actuated by a mechanical lever, handle, or rocking mechanism.

  5. Circuit breaker - Wikipedia

    en.wikipedia.org/wiki/Circuit_breaker

    Toggle the table of contents. ... Electrical switch; ... Two-pole common-trip breakers are common on 120/240-volt systems where 240 volt loads ...

  6. Electric power distribution - Wikipedia

    en.wikipedia.org/wiki/Electric_power_distribution

    Most modern North American homes are wired to receive 240 volts from the transformer, and through the use of split-phase electrical power, can have both 120 volt receptacles and 240 volt receptacles. The 120 volts is typically used for lighting and most wall outlets. The 240 volt circuits are typically used for appliances requiring high watt ...

  7. Electrical wiring in North America - Wikipedia

    en.wikipedia.org/wiki/Electrical_wiring_in_North...

    Lighting and general purpose receptacles are at 120 volts AC, with larger devices fed by three wire single-phase circuits at 240 volts. In commercial construction, three-phase circuits are often used. Common 3 phase configurations within a building are 208v/120 wye, 120/240 center tapped delta and 480v/277v wye. Lighting is usually fed by 277 V ...