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300va transformer, must the core be grounded

Question asked by on Apr 11, 2019
Latest reply on Apr 18, 2019 by wggeiger

I have equipment using a 300va custom wound transformer.   The core is lacquered and I have to grind off the coating to ground the frame.     Is it mandatory that the core be grounded and where can I find that information in the code?   I've been performing searches on NFPA79 and NFPA70 but am not finding what I am looking for.