What differential machine for rated current should be?

Question

Electronics

Good day!
After the counter, there are 2 machines for 16A and 2 for 10A.
What rated current should the differential machine installed between the meter and the group of machines have?

Answer 1

Difamats are different - there are with current protection, there are without. The most common options are without current protection - the current indicated on them does not mean the trip setting, but the maximum current that they can withstand for a long time and can, without harming themselves, break the contacts of the machine.
Thus, you need to take YES for a current equal to the total current of the circuit breakers installed behind it + margin (1.5-2 times) - this is if you assume that all your lines will be loaded "under the setting".
And so, for housing, take 32A

Answer 2

The task of the machine (with and without current protection) is to protect the wires from overheating. It does not have to be a short circuit, the protection will turn on even with a relatively long operation of the wire at high current. Therefore, each wire section has its own rating of the machine.
In your case, we are talking about an "input" machine that de-energizes the entire house. From this "input" machine there are short connecting wires to room machines, therefore the rating of the "input" machine must correspond to the thickness of these wires.
Suppose we took the thickness of these wires with a margin, but we still have a wire suitable for the meter. Yes, the task of the machine is to protect the wires after, but by selecting the denomination for the input wires, we will ensure the normal operation of the wires to the street pole.
As a rule, the "input" machine is set to at least 32A.

Answer 3

If you want to know the topic in more detail, then here is a selection of explanations -
Phases at home - https://pastebin.com/WtyQGWZw