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#216079 09/25/15 01:19 AM
Joined: Mar 2005
Posts: 237
Member
what is the code article that specifically states where and when bonding bushing is required for transformers?
I am installing a transformer with concentric knockouts that
I won't knock all out, usually I knock out my own eccentric and don't need one.

I beleive it is only required on the load side?

What if I bond XO at panel where I punch my own, would I still need one in x-former?

Thanks,
H20

2017 / 2014 NEC & Related Books and Study Guides
Joined: Jul 2004
Posts: 9,663
Likes: 4
G
Member
I think the general rule you use bonding bushings on raceways containing unfused conductors like services. I suppose if you have a transformer secondary conductor before it gets to the first O/C device it should have bonding bushings but I am not sure that is code.


Greg Fretwell
Joined: Jan 2005
Posts: 5,316
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I think Soares is the source of this.

I think in terms of the bonding bushings being used on the 'service' side of any separately derived source, over that portion where the 'ground' is lacking and before the neutral bond.

Joined: Mar 2003
Posts: 849
Y
Member
Don't forget 250.97 2014 N.E.C. . Bonding over 250 volts to ground .


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