480V delta/240V delta transformer bonding

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BDB

Member
Location
Indiana
Occupation
Electrical Designer
Hey guys,
I am installing a 480V delta/240V delta transformer without a neutral. I think that this should be a corner grounded delta on the secondary side. My problem is that I have not been able to find a code reference to this. Am I off-base, or am I just missing it? Thanks for the help, as this is the first time I have installed a transformer like this:grin:
 

don_resqcapt19

Moderator
Staff member
Location
Illinois
Occupation
retired electrician
That is not a system that is required to be grounded. 250.20 It is a design choice. If you install it as an ungrounded system then 250.21(B) requires ground fault detection.
 
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