One wire is live, the other wire leads back to the breaker and carries extra live current back to the box - for a simple view.
If you put the switch on the nuetral wire, all the wires up to it are actually live all the time, including through the light fixture. That can be kinda exciting changing a bulb if you touch the socket....
If you put the awitch on the live wire, then when it is off, very little of the wires are 'live', only the one up to the switch.
Upside down or not wouldn't be a concern, it is whichever wire is hooked to it.
Switches have 2 different colored clamps, and you want to get the right wire onto the right clamp.
Any more, switches get hooked up with ground, and multiple lights, multiple switches, power feeding off to another switch or outlet, so there may be many more actual wires in any one switch box....
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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