Corner grounded delta

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Then there should be no reason to worry about whether the Delta is grounded or not. The Wye transformer is serving the building.

One more question though, are the three service entrance conductors in metallic conduit from the POCO transformer?

The reason I ask is that it is possible that the metallic conduit is serving as the neutral to the meter and ultimately to your service disconnect.

Roger
 
There is a metal mast. The messenger cable is attached to a #10 XHHW and comes down to a fifth jaw in the meter base.
 
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