see if there is metal tab label on the transformer.
actually i cannot recall wat is label on the transformer... usually
there is primary/secondary value of voltage, the secondary voltage
should be the rated voltage if u consider it to be load side.
as for power, usually it is given in apparent power wif rated kVA
or VA.
to find rated current:
I = Power / Voltage (if it's single phase transformer)
or I = Power / (1.732*voltage) (if it's 3-phase)
