Ungrounded 480 to 240 Delta

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droach

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Need some suggestion on grounding this type of system. I know that 250.30 B covers ungrounded systems, but the problem is with using 250.30B In case of a fault will this open up the overcurrent device. This is a delta to delta with no neutral.Any suggestions will help
 
Re: Ungrounded 480 to 240 Delta

The enclosures have to be grounded. However a ground fault will not operate a OCPD, you have to provide Ground fault Detection (GFD) with shunt type trips or relay protection..
 
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