gound to building steel or not?

[Aug720]

I am tapping a 20 amp 120v outside lighting circuit and installing a small transformer to enable myself to wire a 277v sign. The sign only draws 3 amps. My question is, do I have to gound the transformer back to building steel or not? And why?

Thanks,
Aug720

 

[infinity]

What size is the transformer (KVA)?

 

[kevinware]

As I read 600.5(A)

" Each commercial building and each commercial occupancy accessible to pedestrians shall be provided with at least one outlet in an accessible location at each entrance to each tenant space for sign or outline lighting system use. The outlet(s) shall be supplied by a branch circuit rated at least 20 amperes that supplies no other load."

Would this verbiage suggest having to add another 20 amp circuit for the sign?

Thanks,
Kevin

 

[Aug720]

THE TRANSFORMER IS ONLY 1KVA

AND SORRY BUT THE SIGN CIRCUIT DOESN'T APPLY, IT IS A ADDITIONAL SIGN ON THE OUTSIDE OF A EXISTING BUILDING.

 

[don_resqcapt19]

Aug720,
Please don't shout at us!! CAPS is shouting. Thanks.

 

[Aug720]

oh sorry about the caps

 

[bphgravity]

No, just install the proper equipment grounding (bonding) and it will be fine.

 

[Aug720]

Could anyone tell me how you know when you have to bond the transformer back to building steel and when you don't? Is it determined by the size of the transformer?
Thanks for the help,
aug720

 

[George Stolz]

I stepping outside my comfort zone, but I believe the answer is in 250.30(A)(3), exception 3.

But don't put a lot of stock in that.

 

[pierre]

Take a look at 250.20(A)

 

[don_resqcapt19]

George,
I don't think that this qualifies as a Class 1 circuit, so you can't use the exception.
Don

 

[don_resqcapt19]

Pierre,
Did you mean to say 250.20(B)?
Don

 

[LarryFine]

Re: gound to building steel or not?

My question is, do I have to gound the transformer back to building steel or not? And why?

By "gound the transformer", do you mean the metallic parts, or a secondary conductor?

 

[pierre]

Don
Yes I meant (B).
Sometimes I cannot keep the different threads I am thinking of sorted out in my few "gray cells".
Thanks

 

[Aug720]

The secondary conductor....