So it should be 6.6kW, because the power of your electrical equipment is unlikely to exceed the capacity of the circuit breaker,
According to 7.1.1 according to China's standard voltage of the power grid, the general lighting source using 220V voltage: for high-power (1500W and above) high-intensity discharge lamps have 220V and 380V two types of voltage, the use of 380V voltage, in order to reduce losses. Voltage, in order to reduce the loss.
Actually, because of the limitations of power consumption and line current-carrying considerations of the limitations of the above said 6kW, 220V single-phase power at the end of the circuit breaker is not likely to be very large, out of the equipment manufacturers will take into account this point, tens of thousands of kilowatts of single-phase low-voltage power equipment, there is no, but if you say that the electrical equipment is a switchgear transformer, then a single-phase transformer is 100KVA or more. But this is for power supply and distribution, not electrical equipment.