kitha...sorry i can't help you per BS or IEC standards....nec would be no problem.i do think you do need some more info on the motors.
the voltage of the motors.single phase,3 phase.ac/dc.etc and is it fuses or circuit breakers.is it one feed to all 3 motors or 3 seperate feed to each motor.and as far as the service factor of the motor that for sizing the overload/heater.like i said i don't know what the BS or IEC standards are.
