Transformer Grounding

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I have notice most petrochemical plants do not connect their transformer's "neutral" to the transformer case (metallic enclosure). (12kv primary/480-277V secondary). So the transformer metallic enclosure is floating (not grounded). Should be grounded?
 

cpal

Senior Member
Location
MA
We need more info. what is the wiring method from the xfomer sec to the point of utilzation?
do the sec conductors terminate at a ocpd?

Is there an egc from the trans to the eq or panel??
 
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