Transformer location

[cppoly]

Are there any restrictions on transformer location? I can't find any. For instance is a mechanical equipment room ok?

 

[charlie b]

I very often call for a 480 volt panel, a 480-120/208V step down transformer, and a 120/208 volt panel to be installed in mechanical rooms. It allows the mechanical equipment to be served by panels that are close at hand.

 

[infinity]

There is a restriction for above a hung ceiling but as Charlie noted mechanical rooms are often used for transformers and panelboards.

 

[cppoly]

Thanks.

I believe I posted another question about transformers a while ago but I wanted to bring it up again here as a statement.

Transformers aren't required to have dedicated equipment space as required by 110.26(E)

So does that mean you just need the required working space clearances for the front of the transformer? The sides would just need ventilation and a minimum wire bending clearance, so would 6" clearance from both sides be ok and 6" from the rear to the wall be ok?

 

[charlie b]

There are some who believe that you don't even need working clearances for transformers. I am among them. Other members of this forum disagree. My designs will allow 6" clearance all around, for ventilation purposes. I try to allow maintenance access on at least one side, but I do not state which side of the transformer must be installed facing which direction. For transformers it is not always clear which side is the front.