Source google image: https://s2.lmcdn.fr/multimedia/c71400883119/2f8954b382a7/installer-interphone-02z.jpg?$p=hi-w600
Schema electrique sonnette interphone
Source google image: https://s2.lmcdn.fr/multimedia/c71400883119/2f8954b382a7/installer-interphone-02z.jpg?$p=hi-w600