by 
chalky
ANSWERS: 3
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I think you're talking about what is usually called a "3 way switch". This type of switch is actually like 2 switches in one, where one switch has been turned upside-down so that it's ON in the down position. When 2 of these units are mounted in a room, they're "cross-wired" so that there are actually 2 possible circuits which will turn the light on. Each switch closes one of the circuits in each position, so it is the COMBINATION of the two switch positions which completes the circuit. This is much easier to show with a diagram than with a verbal description (click to see full sized). The original description accompanying this picture is here: http://www.misterfixit.com/3wayswch.htm
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ARE YOU TALKING ABOUT A TWO WAY SWITCH OR A THREE WAY SWITCH? YOUR GOING TO HAVE TO GET THE TERMINOLOGY RIGHT, WHY DO THEY CALL A TWO WAY TOGGLE SWITCH A THREE WAY SWITCH? NOT TRYING TO BE A WISE GUY JUST TRYING TO FIGURE IT OUT. ROY BIERNACKI
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twoway switch having a three wires that is two phases and one nutral. and two switches.firest switches connet beyween any two wires one is must be nutral current passing through the wires is completation of the circuit any of the two wires bulb is glow 1-2-3 are the 1st switch (1,3are phases and 3 is nutral) 4-5-6 are second switch (4,6 are phases and 5is nutral) and1,4-3,6 are conected to the bulb, the bulb is taken to the one line is phase and other line is taken to the nutral. 1st we connect the switches in between wires (1-4,2-5,3-6) when the switch is in the 1-4 and 2-5 position light is glow when the switch is in the 1-4 and 3-6 position light is not glow others wise when the switch is in the 3-6 and 2-5 position light is glow when the switch si in the 3-6 and 1-4 position light is not glow
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