Roman asks:
Good afternoon, there is an input network - from a machine - 3ph C 40A on a pole. In our house: we have 1 entrance panel and 2 floor panels.In the entrance box:
as the first option - to put a 3f Dif automatic 30mA, they say that at 15mA of leakage current it already turns off. Suppose the load will be up to 3.5 kW = (16A * 0.4mA) = 6.4mA total leakage current. If we take the maximum cable that I buy (1000m * 10mkA / 3) = 3mA per phase (0.4mA per 1A and 10mkA per 1 meter are taken from open sources). Separately, I want to power up - an electric oven, a sauna on my 3ph differential automatic 40A 30mA
Questions:
1) Is it possible in the input panel instead of the 3-phase Dif, to put three single-phase Dif automatic machines, after them 3 single-phase voltage relays, and then combine into one cable for example VvG-P-ng (LS) 5 × 6 (N, 1ph, 2ph, 3ph, PE)? And transfer to the floor panels, and there to distribute the load. Will it be right? Or is it better to use three-phase and Dif and Voltage relays in the input panel?
2) Is it possible to combine three phases zero and ground in one cable?
3) Did I correctly calculate the leakage currents and will the automatic knock out the Dif and will it perform its functions?
4) If the three-phase stove In the sauna is 9 kW - ((9000/380) * 0.4) = 9.6 mA leakage current,
and a 5kW single-phase oven - ((5000/380) * 0.4) = 9 mA leakage current.
It turns out they cannot be included together, feeding through one WPPT?
Does a three-phase DIF have a leakage current of 30mA on each phase? those. 9.6 need to be divided by three more?
5) Do I understand correctly that the leakage current will only be on the cable under load?
6) For an electric oven from the floor panel, I'm going to forward a separate 4kv cable, a 24A machine and a special socket.
Is this enough for a 5kW oven or is it better to throw a 6kv cable and a 32A machine?
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