Working Clearance

[Orlando_Joe87]

Fighting over the required clearance between the left side of a 225 kva step-down transformer (on floor middle of room), primary voltage of 480V and a 400A 240V equipment disconnect (on wall). I say 4'-0" and client says 3'-0" will be fine. Is the transformer considered "Live Parts"?

 

[tortuga]

Transformers don't require any working clearance, in my opinion.
I have hung them in a ceiling.
The 240V secondary disconnect needs 3', the 480 primary disconnect if any needs 4'.

 

[infinity]

Are you asking about the working space distance for the 400 amp switch?
So you have one piece of equipment that is 480 volts the other is 240 volts? Going by memory it sounds like 42" is required.

 

[don_resqcapt19]

Fighting over the required clearance between the left side of a 225 kva step-down transformer (on floor middle of room), primary voltage of 480V and a 400A 240V equipment disconnect (on wall). I say 4'-0" and client says 3'-0" will be fine. Is the transformer considered "Live Parts"?

Does the disconnect face the left side of the transformer?
For most transformers, the sides are not removable, so the side would be a grounded part. To determine the required working space we need to know exactly what voltage system the 240 volt disconnect is. Assuming that the voltage system does not exceed 150 volts to ground the required working space is 3'.
If the disconnect would face a removable cover on the transformer, many would see that as live parts on both sides and trigger a condition 3 space of 4'.