Working Clearances

[Vector T]

We have an installation that has a 480 volt to 480 volt isolation transformer located in a hall closet that has two double doors that open up for access. The question comes in does the 3' clearance rule apply here because the accessibility of the transformer for working clearances. The hallway is 8' wide and therefore gives plenty of working clearances. I am wondering if this a correct installation.

 

[charlie b]

If we change your question to address a 480 volt panel, instead of a transformer, then my answer would be that opening the doors and using the hallway to provide the minimum working clearance is allowable by code. Let me offer that, as I think it answers the question you are trying to ask.

As to the requirement to have working clearance for transformers at all, that is a matter of some debate. My view is that it is not needed, under the belief that live work is not likely to be required. Others will contend that thermography is a task that involves live work, and therefore a transformer does fall within the working clearance rules.

Welcome to the forum.

 

[Vector T]

My sentiments exactly Sir. I just wanted to confirm my thinking was correct. thanks for the reply and confirmation