How to calculate the 380V voltage divided into several 220V currents in the distribution box There is a distribution box on the second floor. The main power supply is led from the switch cabinet on the first floor. The air switch in the distribution box on the second floor is like this. The total air switch is ABC three-phase power, and N and PE are directly connected to the line, There are five 1p air switches in the distribution box for lighting, and the power is like this: the first air switch is 3500W, the second is 5000W, the third is 2500W, the fourth is 1000W, and the fifth is 2000W There are four two p air switches with leakage protection in the distribution box, which are used for sockets. The power is like this: the first is 2000W, the second is 1500, the third is 2600, and the fourth is 2400W There are also six 380V 3P air switches in the distribution box, two for air conditioning, both of which are 7 kW, What is the current of this distribution box, (please tell me the calculation method) how thick cable should I choose 2. Should I choose 3P air switch or moulded case circuit breaker for the general air switch of the distribution box on the second floor 3. Is the cable leading from the second floor to the first floor switchgear directly pressed on the copper bar in the switchgear, or is the cable led from the copper bar through the molded case circuit breaker and then pressed on the molded case circuit breaker? If it passes through the molded case circuit breaker, what size of the circuit breaker should I choose 4. What size of the total air switch in the distribution box on the second floor should I choose, the same as the rated current or twice the rated current

How to calculate the 380V voltage divided into several 220V currents in the distribution box There is a distribution box on the second floor. The main power supply is led from the switch cabinet on the first floor. The air switch in the distribution box on the second floor is like this. The total air switch is ABC three-phase power, and N and PE are directly connected to the line, There are five 1p air switches in the distribution box for lighting, and the power is like this: the first air switch is 3500W, the second is 5000W, the third is 2500W, the fourth is 1000W, and the fifth is 2000W There are four two p air switches with leakage protection in the distribution box, which are used for sockets. The power is like this: the first is 2000W, the second is 1500, the third is 2600, and the fourth is 2400W There are also six 380V 3P air switches in the distribution box, two for air conditioning, both of which are 7 kW, What is the current of this distribution box, (please tell me the calculation method) how thick cable should I choose 2. Should I choose 3P air switch or moulded case circuit breaker for the general air switch of the distribution box on the second floor 3. Is the cable leading from the second floor to the first floor switchgear directly pressed on the copper bar in the switchgear, or is the cable led from the copper bar through the molded case circuit breaker and then pressed on the molded case circuit breaker? If it passes through the molded case circuit breaker, what size of the circuit breaker should I choose 4. What size of the total air switch in the distribution box on the second floor should I choose, the same as the rated current or twice the rated current

1) Total power: P = 3.5 + 5 + 2.5 + 1 + 2 + 2 + 1.5 + 2.6 + 2.4 + 7 + 7 = 36.5kw
Distribute the power evenly in three phases as far as possible
Total current: I1 = P / (√ 3x380x0.85x0.9) = 72.5a, where: 0.85 --- system power factor
0.9 --- system efficiency
These loads can not work together at the same time, and may not reach the maximum power at the same time, so the actual current is:
I = i1x0.7 = 50.75a --- total current of each phase of incoming line
Incoming cable selection: YJV 4x16 + 1x10 cable
2) The main switch is int-63 / 3P disconnector
Moulded case circuit breaker is air switch. There is no air switch here. Only the disconnector is used. The air switch is used for separate closing below
3) The cable from the first floor can be directly connected to the upper end of the disconnector, the outgoing line can be connected to the copper bar, and then connected to each sub switch
4) The main switch on the second floor is int-63 / 3P disconnector. Generally, it is 1.2 times of the rated current
It is protected by a superior switch