120/208V 3 ph GFIC's needed for class room lab

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Ragin Cajun

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Upstate S.C.
I am working on a total renovation of a classroom building. Several of the labs use 20A test boxes to provide the students with 120/208V. 3 ph. The school wants these to be GFCI protected at the usual 5 ma. for safety purposes, which I agree with. Anybody have info on anything "commercial" we can use? They have used in the past a rigged up system with donut CT's etc. We really want something with a UL label for the renovation.

Thanks,

RC
 
Considering the latest safety requirements they should consider using less than 50 volts.

You could provide say 3 phase four wire at 48 volts, with three single phase transformers.
 
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