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  2. Multiway switching - Wikipedia

    en.wikipedia.org/wiki/Multiway_switching

    A "4-way" (intermediate) switch is a purpose built double pole, double throw (DPDT) switch, internally wired in manufacture to reverse the connections between the input and output and having only four external terminals. This switch has two pairs of "traveler" terminals that it connects either straight through, or crossed over (transposed, or ...

  3. Switch - Wikipedia

    en.wikipedia.org/wiki/Switch

    Single pole changeover or single pole, centre off or single pole, triple throw Similar to SPDT. Some suppliers use SPCO/SPTT for switches with a stable off position in the centre and SPDT for those without. Serial switch or two-circuit switch [citation needed] DPST (2P1T) Double pole, single throw: Double pole: Double pole

  4. Zeros and poles - Wikipedia

    en.wikipedia.org/wiki/Zeros_and_poles

    In this case a point that is neither a pole nor a zero is viewed as a pole (or zero) of order 0. A meromorphic function may have infinitely many zeros and poles. This is the case for the gamma function (see the image in the infobox), which is meromorphic in the whole complex plane, and has a simple pole at every non-positive integer.

  5. Double switching - Wikipedia

    en.wikipedia.org/wiki/Double_switching

    A double-switched relay cannot close inadvertently with the application of the same current. At least two separate faults would be required to allow this relay to close inadvertently. Double switching , double cutting , or double breaking is the practice of using a multipole switch to close or open both the positive and negative sides of a DC ...

  6. Relay - Wikipedia

    en.wikipedia.org/wiki/Relay

    SPST-NC (Single-Pole Single-Throw, Normally-Closed) relays have a single Form B or break contact. As with an SPST-NO relay, such a relay has four terminals in total. SPDT (Single-Pole Double-Throw) relays have a single set of Form C, break before make or transfer contacts. That is, a common terminal connects to either of two others, never ...

  7. Light switch - Wikipedia

    en.wikipedia.org/wiki/Light_switch

    This "double gang" (two unit) installation uses non-metallic-sheathed cable and twist-on wire connectors. In electrical wiring , a light switch is a switch most commonly used to operate electric lights , permanently connected equipment, or electrical outlets .

  8. Double-pole - Wikipedia

    en.wikipedia.org/?title=Double-pole&redirect=no

    This page was last edited on 18 September 2015, at 20:54 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

  9. Split-phase electric power - Wikipedia

    en.wikipedia.org/wiki/Split-phase_electric_power

    This reduced low-voltage system is used with 110 V equipment. No neutral conductor is distributed. In high-hazard locations, additional double-pole RCD protection may be used. The intention is to reduce the shock hazard that may exist when using electrical equipment at a wet or outdoor construction site, and eliminate the requirement for rapid ...