Transformer Disconnect

[noonan]

We are looking at adding a small sub to feed a piece of equipment (500 ton chiller) which will be fed from an existing 4160v fused disconnect. The disconnect is outside and the location of the transformer will be inside the building, about 75 feet away from the switch.

I'm looking for the section of the code that indicates if an additional disconnect is required adjacent to the transformer.

One suggestion is to use a remote shunt-trip device near the transformer.


Thanks.

 

[don_resqcapt19]

Transformers do not require a disconnect at the transfomer. As long as the fuses at the remote disconnect protect both the primary feeder conductors and the transformer, you are in compliance with the code.

 

[zog]

We are looking at adding a small sub to feed a piece of equipment (500 ton chiller) which will be fed from an existing 4160v fused disconnect. The disconnect is outside and the location of the transformer will be inside the building, about 75 feet away from the switch.

I'm looking for the section of the code that indicates if an additional disconnect is required adjacent to the transformer.

One suggestion is to use a remote shunt-trip device near the transformer.


Thanks.

Fletch, I mean Noonan, is there anything else fed by this existing switch?

 

[noonan]

Fletch, I mean Noonan, is there anything else fed by this existing switch?

Nope. The switch used to feed the old chiller starter at 4160.

(I also respond to Ted Nugent and Harry Truman).

 

[zog]

Then I would say you are good (I was thinking about isolation issues)

 

[noonan]

Thanks,

From what I've read, it's a "nice to have" but not required by code.

(In our corporation, we don't do things just because it's a good idea anymore.)

I'm going to run it by an A/E just to be sure.


Cheers!

 

[don_resqcapt19]

(In our corporation, we don't do things just because it's a good idea anymore.)

It is a rare company that does.