Properly grounding / bonding a transformer with building steel - Electrician Talk - Professional Electrical Contractors Forum

KnipexUser · 03-29-2012, 10:01 PM

It's been a while and I just want to ground / bond this transformer with building steel, water, etc. I know the neutral and ground should be bonded in the transformer. So then just bond the transformer to building steel before grounding on the secondary side too? (i.e. do you have to hit building steel from the transformer and on the secondary side).

Thanks for any advice or code help

HARRY304E · 03-30-2012, 12:16 AM

Quote:

Originally Posted by KnipexUser

It's been a while and I just want to ground / bond this transformer with building steel, water, etc. I know the neutral and ground should be bonded in the transformer. So then just bond the transformer to building steel before grounding on the secondary side too? (i.e. do you have to hit building steel from the transformer and on the secondary side).

Thanks for any advice or code help

Welcome to the forum.....

What type of transformer do you have.?

**frenchelectrican** · 03-30-2012, 01:48 AM

Quote:

Originally Posted by KnipexUser

It's been a while and I just want to ground / bond this transformer with building steel, water, etc. I know the neutral and ground should be bonded in the transformer. So then just bond the transformer to building steel before grounding on the secondary side too? (i.e. do you have to hit building steel from the transformer and on the secondary side).

Thanks for any advice or code help

The answer will varies a little depending on what conferation the transfomer you are using.

Merci,
Marc

KnipexUser · 03-30-2012, 06:11 AM

It's a 480v to 120v transformer. I think it's a 75kva

Pete m. · 03-30-2012, 08:21 AM

Take a look at 250.30

Pete

nitro71 · 03-30-2012, 10:10 AM

Basicly you're building the GEC system for your SDS. You can bond in the transformer or in the first disconnect. Bonding in the transformer is how you generally see it done. MikeHolt has a picture somewhere on his website I've seen.

I bring the neutral to a double lug on the XO. From there I bond to the case with a lug that has multiple taps on it. Bring my GEC, EGC's and other bonding to that point. No hard fast rule on exactly where you bond in the transformer.