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Question:

How to wire 12 awg wire to breaker and breaker box?

just need a little help to make right.just wiring an outlet from building to breaker box outside.. which way is the right way to wire it to a breaker then the box. Got the right breaker. Thanks

Answer:

This doesn't sound like an easy answer without seeing it. For instance, how long is the wire run; is it entirely outside (if so, then you'll need either conduit for the full run, or UF-B rated wire buried below the freeze line with conduit where it exits the ground to the Service Panel). Outside receptacles should also be GFCI (Ground Fault Circuit Interrupter) protected. A single pole 20amp breaker should be used for a 12/3 wire. Load wire (black) goes into the screw of the breaker; the neutral (white) wire screws into the neutral bus bar of the service panel (breaker box), and the bare ground wire screws into the ground bus bar. Since these wires are interchangeable, it really doesn't matter which side of the panel you hook the neutral and ground wire to. BE CAREFUL!!!!! The main bus bars can still be hot (charged) even with the power turned off. If you ground yourself and touch the wrong thing, you'll be wondering what went wrong from the great beyond. Get a basic electricity book from Home Depot, or look on youtube. If you're not 100% confident, please leave this to a professional.
in case you are able to desire to ask this question you don't comprehend adequate to do it suitable. Get an electrician to do it. you will the two electrocute your self or burn your place down in case you do it.
There are too many rules for safe wiring that you don't even have an inkling about. Connecting to the panel is the simplest part and you ask about that? Hire it done.
Electricity is too dangerous to be playing with if you don't know what you are doing. This is such a basic issue that it makes it obvious that you would be putting yourself and others in danger by you doing it. Based on the wording, I don't think you are even using the correct terminology. There is way more to learn to safely do this than can be said here. Get a professional to do this. Among other things, if you do it wrong, there is a risk of the building catching on fire. That is in addition to the electrocution risk to you while doing the work and for other people after the work is done.

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