What to install at the entrance to the apartment?
Hello! I need your consultation. The situation is this - in the entrance to the counter to the apartment there is a 50A automatic machine, it is planned to implement a dashboard with several group RCDs at 40A in the apartment. Tell me what to install at the entrance to the apartment (between group ouzo and a machine in the entrance)? Selective RCD, simple switch? I’m not an electrician myself, I'm trying to figure it out. Thank.
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Hello! It is possible selective RCD, but why? For greater reliability? Maybe. You can put a fire protection RCD with a large differential current. Why several group RCDs with such a current, are those lines protected by individual automatic machines? Do you know that RCD only works on diftoki, but not on short-circuit currents and overloads?
If in order to de-energize the apartment for work, you can put a switch or another circuit breaker, but in the latter case it is unlikely that adequate selectivity can be achieved without losing the efficiency of the current-time characteristics.