kVA Off a Pole-Bolted xfrmr

Your formula is for a single-phase installation. Since you metioned delta connection, this sounds like 3-phase. If it's connected 3-phase, you need a √3 factor in your calculations.

How are you getting the 120? Even if you have a neutral center-tap on one phase (sometimes called a "high-leg" system), you still need 4 wires to get all 3 phases plus the neutral.

Also, is the transformer a single 3-phase unit, 2 1-phase units connected open-delta, or 3 1-phase units connected full delta? If the installation is multiple units, what is each can rated?

this is a 120/240v delta system, only one can on the pole.

you ARE correct, I do need the 1.732 in the calc. it seems as though when I do the calc, it comes out to 24kVA. this seems pretty hi for such small load. I do know for a fact that these "b-boxes" are really small amps, prolly 40-50 range, but I'm calc'ing out for the 100 amp breaker, per regualations.

thanks