Which machine to install in the apartment: 32 or 40 A?
Good day. I called an electrician from the management company regarding the assembly of the distribution panel in the apartment, because I change the wiring to copper. He says that it is allowed in our homes to put ABB of ABB at the input, and the cable goes 2x6 sq. Mm aluminum on the stairs and 3x6 sq. Mm copper will go to the apartment to the distribution panel. At the moment, he is standing at the entrance to the counter on the C32 ladder of Deck. Tell me to listen to it or still buy ABB instead of Deck on C32? Or maybe put on the stairs at 40, and in the apartment C32?
The second question is about the cable from the distribution panel in the apartment. He wanted to run two separate cables of 4 sq. Mm on the hob and oven and protect each AB on the C20, he says - one 3x4 sq. Mm is enough and protect the AB C25.
Tell me how to be? To listen or insist to do in my opinion?
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When choosing the rating of the machine, they are guided by the permissible cable load. The aluminum cable can withstand less load than the copper, so in your case you need to take into account the aluminum input cable. For aluminum cable with a cross section of 6 square meters. mm, a 25 A circuit breaker is recommended. With a 32 A circuit breaker, the cable will be overloaded, as the thermal release of the circuit breaker does not work immediately when the rating is exceeded, and it may work for a long time with a slight overload until the release trips. With a 40 A circuit breaker, the cable will be damaged by overload. There is no such thing as “it’s allowed to put 40 A on the input in our houses” - in any case, the cross-section of the input cable must be taken into account.
As for the oven and hob - in this case, you need to proceed from their total load and then select the cable. For copper cable 4 sq. mm automatic machine for protection no more than 25 A, for a copper cable 6 sq. mm - automatic machine no more than 32 A.