Connections to this type of transformer are basic-three wires into the high side (H1, H2, and H3) and three wires out from the low side (X1, X2, and X3). No. 10 AWG primary-side wiring (22.6A at 480V) and secondary-side No. 8 (45.1A at 240V) will give you full use of the transformer capacity.

Can a transformer work on DC?

Transformer only works on AC and cant be operated on DC i.e. it has been designed to be operated only and only on alternating current and voltage.