The conductors feeding the Xfmr are 1/o. The trash compactor is being relocated from an existing site. There its being fed with 3 # 12's, Which feed the control panel for the compactor.
I realize it seems like it should be simple... but to be completely compliant requires due diligence and makes it a lot more complex determination. In the end, it could prove to be simple, but until you jump through all the hoops, you'll not know for certain.
I'm not sure what you mean by being relocated from an existing site. The only thing that matters is whether it was powered by the same 480V system the transformer is powered by. If so, that would exclude having to perform a capacity determination of the 480V system (i.e. load calc', and equipment, OCPD, and conductor ratings ahead of the transformer OCPD).
Here's a brief list of issues that come to mind:
- Adding or just relocating load on 480V system (mentioned above)
- Transformer rating (kVA)
- Transformer primary conductor rating (just size isn't enough)
- Transformer primary OCPD rating
- Transformer secondary OCPD rating(s), if any
- Load served by transformer or other parameters which establish the primary conductors and OCPD would not be underrated with the added load, if not already covered by the preceding.
If all okay, then you have to deal with the tap conductor and OCPD ratings requirements to power the compactor...
