Why is that when the electric to the home is cut, that the monitor continues to function?

Why is that when the electric to the home is cut, that the monitor continues to function?

This is because the monitor is not supplied by the electricity of each apartment. Both the monitor and the outdoor panel are supplied by the collective installation which is forms part of the common infrastructure of the building. This characteristic implies a significant advantage, that in the case of an emergency, even though the electricity to the apartment has been cut, it will be possible to communicate with the street.

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