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tesla coil grounding? Answered

I am building a tesla coil, the first i have ever built. I know that one side of the secondary coil is supposed to be grounded (the other side being the donut). Problem is, i am not clear where to ground it to. The ground socket on the wall outlet? a nail stuck in the ground? the negative terminal on the first transformer? I'd like to have this straightened out.

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you have many options where you can ground it, just like comhippy said if you use the ground in your house it will destroy and appliance with a lower voltage then the coil (basically everything) but you can connect it to a pole and stick it into actual dirt, or you can have come fun with it, try sticking the ground wire in a bananna or somthing (please dont use anything alive)

eather the ground in the wall of a metal pole that is stuck a few feet into the ground.

Not the wall, It would fry everything in the house.

btw if your using a nst make sure you ground the case of that