What is needed to assemble a 380V 15kW switchboard?
Good afternoon! It is necessary to assemble a 3ph shield of 15 kW for a private house (which is not yet available), technical specifications have been obtained. But there are a lot of questions left, because We do not collect the shield every day. By telephone, an employee of an energy distribution company at the speed of light dictated what should be in the shield. On input 3p 32a. Immediately the question: at 4.5 or 6kA of the ultimate breaking capacity? Is 4.5 enough for an apartment, but for a house? Next is the counter, but with it it is more or less clear: 3ph to 60A. Further, RCD 3F 32A (as the employee said), I think that RCD should be taken a step further, i.e. on 4p 40A? And will 30 mA be enough or 100 mA? I don’t want to install China at all, I prefer the ABB Basic M economy series. I want to put a couple of sockets on a DIN rail. And that’s it. The rest of the wiring will be in the house. I would be grateful for the clarification!
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Hello! Answers to your questions:
1. Breaking capacity. And how does a house in this sense differ from an apartment? I believe that there is not much difference.
2. Yes, RCDs are one step more. 100 mA is a bit much for the home, but not everything is so simple. RCDs for 100-300 mA are installed at the input for fire protection purposes, then each individual line is protected by a more sensitive device, which increases the reliability of protection. In general, RCDs are selected along the line length and natural leaks. Therefore, it is not a fact that at the input of a large house an 30-mA RCD will not falsely trigger.
3. Yes, at least one outlet at the entrance to the automatic machines of the protective lines will be ideal for repair and construction
There is such a thing as “RCD zone of responsibility”
In relation to “one step less” - this refers to what is installed after the RCD. Apparently, you combined the fire and group RCD. It is not clear where the PU will be installed, there may be options for choosing the RCD rating.
Thanks for the clarification. And another question: is it necessary to put a separate machine in front of sockets on a din rail? If necessary, is 1p 16a enough?