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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 ...
The internal-drive square socket for screws (as well as the corresponding triangular socket drive) had been conceived several decades before the invention of the Robertson screw and driver. An earlier patent covering both square-socket- and triangle-socket -drive wood screws, U.S. patent 161,390 , was issued to Allan Cummings of New York City ...
CEE 7/1 wall socket, accepts CEE 7/2 (unearthed) plug and also CEE 7/4, CEE 7/6 and CEE 7/7 (earthed) plugs. The International Commission on the Rules for the Approval of Electrical Equipment ( IECEE ) was a standards body which published Specification for plugs and socket-outlets for domestic and similar purposes as CEE Publication 7 in 1951.
A distribution board (also known as panelboard, circuit breaker panel, breaker panel, electric panel, fuse box or DB box) is a component of an electricity supply system that divides an electrical power feed into subsidiary circuits while providing a protective fuse or circuit breaker for each circuit in a common enclosure.
An external power supply, AC adapter or power brick, is a power supply located in the load's AC power cord that plugs into a wall outlet; a wall wart is an external supply integrated with the outlet plug itself. These are popular in consumer electronics because of their safety; the hazardous 120 or 240 volt main current is transformed down to a ...
The corresponding notch in the female connector body is 1.8 ± 0.1 mm (0.071 ± 0.004 in) wide and ends at a radius of 6.2 ± 0.1 mm (0.244 ± 0.004 in) from the connector centre. With the angles measured clockwise looking at the female connector (counter-clockwise looking at the male), the various key positions indicate:
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