I have a situation where the owner has a 480V, 3 Phase, 30KVA transformer and a 60A disconnect already installed (existing). I think the primary side disconnect is ok, although a bit higher than needed (~50A). However, he wants to install a very small sub-panel, maybe, <=20A. Is it okay to attach a <=20A sub-panel to a 30 KVA transformer which has a output capacity of ~100A? This is a light industrial/commercial facility where he wants to connect a couple of lights and a couple of receptacles (no more than 3-4 Amps) for rental purposes. The tenant will eventually install proper size panels etc when they move in. Thanks a LOT for your assistance.