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2. Light switch - Wikipedia

   en.wikipedia.org/wiki/Light_switch

   A toggle light switch Internal components of a toggle switch. The toggle mechanism provides "snap-action" through the use of an "over-center" geometry. The design was patented in 1916 by William J. Newton and Morris Goldberg. [2] The switch actuator does not control the contacts directly, but through an intermediate arrangement of springs and ...

3. 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.

4. Multiway switching - Wikipedia

   en.wikipedia.org/wiki/Multiway_switching

   These switches appear externally similar to single pole, single throw (SPST) switches, but have extra connections which allow a circuit to be controlled from multiple locations. Toggling the switch disconnects one "traveler" terminal and connects the other. Electrically, a typical "3-way" switch is a single pole, double throw (SPDT) switch. By ...

5. NEMA enclosure types - Wikipedia

   en.wikipedia.org/wiki/NEMA_enclosure_types

   6 and 6P: Submersible. Design depends on specified conditions of pressure and time; submersible in water or oil; used in quarries, mines, and manholes. 7: Certified and labelled for use in areas with specific hazardous conditions: for indoor use in Class I, Groups A, B, C, and D environments as defined in NFPA standards such as the NEC. 8

6. Pattress - Wikipedia

   en.wikipedia.org/wiki/Pattress

   For plasterboard, 2-gang, 3-gang or 4-gang boxes are available instead. The center distance between inserts is 71 mm, as in most of the rest of Europe, for horizontal combinations; for vertical ones, it is 71, 60 or 57 mm. Single gang boxes, as well as multi-gang boxes or rows of boxes with a center distance of 71 mm, can accommodate standard ...

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   mail.aol.com

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