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Posted By: Yoopersup 480 volt 3 phase hot water heater (for shower use) - 04/29/10 03:58 PM
Question came up . Is GFI required.
I;d say No .
Comes under 422
Posted By: HotLine1 Re: 480 volt 3 phase hot water heater (for shower use) - 04/29/10 11:50 PM
Agree.
Posted By: frenchelectrican Re: 480 volt 3 phase hot water heater (for shower use) - 04/30/10 06:16 AM
No you do not need RCD { GFCI } with triphase waterheater unless the manufacter specifed in the installment manual or cut sheet.

Merci,Marc
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