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Hi,As long as the transformer is Non-GFI then it will be fine for a medium size Tesla coil. The transformer should say if it is GFI or not. If it has green red and yellow LEDs on them then they are GFI and will not work for Tesla coils. GFI are put on transformers to protect them in case of short circuit. The way Tesla coils work would tell a GFI protected transformer that there is a short circuit and shut the transformer down. I hope this helps.
Spooky Tesla Spirit Radio
LED tester with adjustable current
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