13,200/480Y

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zooby

Senior Member
Location
Indiana
Occupation
maint. electrician
I am going to replace a 480/277V panel that sits right next to one of our transformers. I am sure you are all tired of the subject but.......By my eye the grounding and bonding happens right there in the transformer secondary. Why again at the panel I will set(replace ) ? is it just that it is considered the first point of service? or as I heard Mike Holt say in one of his videos [ paraphrasing] "dont worry about whats going on in there. thats not NEC." thanks for any insight!
 
Do you own the transformer? If yes, it is not a service point. However there are several code sections which have requirements similar to what you will find in Article 230.
 
jim dungar said:
Do you own the transformer? If yes, it is not a service point. However there are several code sections which have requirements similar to what you will find in Article 230.
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Yes Jim......there is a loop system here from different subs and we do own the transformers. Im sorry, so because we own it the trans secondary is NOT a service point?
 
Yes. Per NEC Article 100:

"Service Point. The point of connection between the facilities of the serving utility and the premises wiring."

Cheers, Wayne
 
zooby said:
Yes Jim......there is a loop system here from different subs and we do own the transformers. Im sorry, so because we own it the trans secondary is NOT a service point?
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For the most part these transformers are treated no differently than your small 480-208Y/120 transformers.
Your neutral to ground bonding can be done internal to the transformer or at the secondary disconnect(s).
 
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