It is required to mension the intended load to be connected on secondary side., while procuring Transformer having primary 3 phase ,415 Volts, 2 wire input , 50 HZ A.C., with secondary 1200 Volts , 50 HZ A.C., 7.8 KVA., 2 wire with required voltage tolerance input and output voltage. Accordingly tapping can be asked if required