transformer sizing

[Nardie]

I have a 5 KVA 480V-240/120V transformer that supplies two 2500W heaters at 240V and a battery charger at 120V, with at times a 480W load(battery charger). The heaters are for a DG water jacket heater, as well as the battery charger. From my calculations a 5 KVA XFMR only supplies 20.8A, yet I need at least 24A on at least one leg when everything is operating at it's max. So my concern besides overheating the transformer, is there any code violation? This is an existing installation before my time. The primary OCPD is 15A and the secondary is 30A with 10 AWG wires.

 

[augie47]

You load is over the 5kva rating. Unless your heater load is continuous I would not be concerned.
You have prop[er primary protection.

 

[ActionDave]

I agree with augie. This is one of the few places left where the NEC stays true to its roots as a safety standard and not a design manual. As long as everything is properly protected the NEC doesn't care what size transformer you install.