Is this 3 phase?
Any help? Looking for over current sizing on both sides of transformer
112000 / 208X1.732 = 310.9 amps primary 112000 / 480X1.732=134.7 amps secondary
Will you be running THHN in conduit?
350 kcmil will give you 310 amps capacity and 1/0 will give you 150 amps. These are copper conductors
#1 will give you 130 amps capacity
If you protect the transformer at 300 amps on the primary you will be fine on the secondary with protection afforded at 130 amps. There are not 130 amp breakers so a 150 amp breaker will be fine on the secondary. The primary will actually protect the whole installation.