• On every such setup that I've seen, the light is off when both switches are in the same position, and on when the switches are not in the same position. That is, there is no particular "on" or "off" position for either switch. So, in a simple table (U = up, D = down): 1 | 2 | Light ---+---+------- D | D | Off U | D | On D | U | On U | U | Off
  • Electrically, it doesn't matter at all It is aesthetically pleasing, however, if the device is off when both switches are down [three way switches have no "off" position-one traveler or the other is always fed]
  • They are called ''three way switches'' and (if you look at the toggle closely) you'll notice they have no ''on'' or ''off'' position. The switches in this diagram are not allowing current to flow, so the bulbs are off. If you ''flick'' the first switch (in the left/bottom of the diagram) the diagonal line would now be in the same position (down) as the second switch. Notice now how the current has a complete route (black line in diagram) to follow leading to the bulbs and turning them on.
  • the simple answer is if the switches were set up right in the first place then whenever both switches are in the same postion (ie both off or both on) then light will be off when there in the opposite postion (ie 1 off 1 on) then the light will be on
  • That's called a 'three way switching system'. Two three way switches are utilized. Three way switches (if you look closely) are not marked ''ON'' or "OFF". They can be in either position and be on OR off, depending on the other switches position yo... SEE MY ORIGINAL ANSWER FOR DETAILS
  • not sure

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