Why is the introductory automaton knocked out, not the group one?
Hello. On the landing on my apartment is a Tdm c 50 machine. There are three iek c20, c 16, c16 machines in the apartment. Apparently, a short circuit happened before, because once the extension cord was smoking and the machines were knocked out in the apartment. A few days later, many appliances were turned on and the machine was knocked out on the landing. The question is, why did not the machine guns in the apartment get knocked out? Perhaps they are now defective?
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Hello! A similar question was considered here, check out https://our.electricianexp.com/en/pochemu-pri-korotkom-zamykanii-vybivaet-vvodnoj-avtomat-vmeste-s-gruppovym.html I can also add, on the landing there is an automatic machine of this denomination only for your apartment or several at once? Generally not entirely clear! Do you have single-phase or three-phase input? I believe that according to the scatter of AB denominations in the apartment panel - phase one. Of course, machine guns could fail. Although the machine on the shield could also fail - as a result of false positives. To get started, simply check the quality of the contacts in the terminal blocks of the machines and, if they are darkened, strip them and re-extend. If there will be repeated knockouts at rated load, there are two options:
1. The machines in the apartment stopped responding normally to the load.
2. The machine in the entrance stopped responding normally to the load