External transformer UL 508A

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smoothops10

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Anyone design an external transformer fed from a UL508A panel. I don’t see anything in the standard saying not permissible but never seen it.

Would be a nice option for pump stations with duplex MSCP that have power loads like a convenience receptacle and generator block heater but no other 120V loads aside from control circuits which would be from a separate CPT within the panel. Looking to feed a load center or panel board external to pickup auxiliary 120V power ckts.

Thought please?
 
smoothops10 said:
Anyone design an external transformer fed from a UL508A panel. I don’t see anything in the standard saying not permissible but never seen it.

Would be a nice option for pump stations with duplex MSCP that have power loads like a convenience receptacle and generator block heater but no other 120V loads aside from control circuits which would be from a separate CPT within the panel. Looking to feed a load center or panel board external to pickup auxiliary 120V power ckts.

Thought please?
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Why not?

Downside is if you need to remove power from the UL panel, you will not have 120V available otherwise, based on what you describe so have a portable generator ready if you need plug and cord tools
 
I have used Sq D Mini power zone for 480 pump stations for 120/240 loads, the Square D power zone has a 480 V disconnect, step down transformer, and small secondary panel. It requires a connection to a grounding electrode and primary power and you’re done.
 
I have hung 5kVA 3R transformers in the outside of duplex panels (to keep heat out of the panel) for station service loads, UL never had a problem with it. The UL 508A standard doesn’t specifically list transformers but the UL 1561 standard for transformers is listed as one of the accepted other standards within 508A.
 
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