ECN Forum Forums Photo Discussion Forums Photos for General Discussion Transformer Bonding

Nick,

Is the secondary neutral connected directly to a grounding electrode, or just to the primary EGC ?

The secondary neutral is connected to the grounding electrode. You can see the GEC coming in from the right, it is properly bonded then runs directly to the XO bus. It terminates just to the left of the blue C phase conductor.

Got it. It looked like only a lug.

Not really within the scope of your questions / comments of this post, but I was just pondering the Manufacturer's choice in the Parallel Secondary Windings on a somewhat small Transformer.
This looks like a 75KVA Transformer.

My views here do not reflect anything more than just why the coils were wound Parallel for a semi-small power rating. But then again, I have seen some really large and complex Transformer cores!
Maybe I am Jaded

As far as the Grounding goes, I like the fact that the Installing Electrician included the Primary circuit's EGC, but as Nick has said, the #6 bond to the GES for this Transformer's Secondary is insufficiently sized.

I'll probably catch he** from the Inspectors in the forum here, but it looks like someone dropped the ball when this was Inspected!
I say this because all the Transformers I've done, the dead-front covers were left off until Inspection was done [card signed].
If this was done by me, it would have been caught by the Inspector and the good 'ol Non Compliance / correction card comes out!
On the other hand, maybe this was overlooked.

Maybe I'm a show-off , I just want the Inspectors to be able to see something that has been done with an "Artistic" approach, which might never be seen again by another person.
BTW, It's always nice to hear an Inspector say "Look At That Nice Work", since it's hardly ever heard from anyone else

Scott SET

Good guess Scott. It is a 75KVA!

I got it right?!!!? Finally!

Thanks for the message, Nick.

Scott SET