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open wye - "corner-gnd" wye

open wye - "corner-gnd" wye

open wye - "corner-gnd" wye

(OP)
I have a customer to request grounded wye - grounded wye 480 volt service.  A 1000 kVA y-gnd to y-gnd (277/480 volt) transformer has been installed.  The electrician has wired the facility for corner grounded delta.  

Take the secondary ground off and connect?

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