The current Home + Security video station can be replaced by the Classe 300 EOS: - Villa or single-family and two-family context: replacement without modification of the video intercom wiring - House or multi-family context: depending on the characteristics of your installation, it may be sufficient to replace the apartment station or it may be necessary to add a special power cable ref. 346020 For the sizing of multi-family systems, please refer to the technical manual with the general installation rules for 2-wire systems