See if your power supply is single-phase 220 volts or three-phase four-wire power supply. You may be talking about the load of all electrical appliances, so you don't know how high the simultaneous rate of your electrical equipment is. If all of them are used at the same time, if it is three-phase four-wire power supply, I suggest you balance the single-phase load distribution on the three-phase line. If it's only 220 volts, it's not necessary. If all of them are used at the same time, the 220-volt single-phase power supply selector switch will get 220.