It is possible to replace the current internal station with the EOS Class 300: - Single or two-family housing context: replacement without modification of the video door entry system wiring - Co-ownership or multi-family context: depending on the characteristics of your installation, it may be sufficient to replace the internal station of the apartment or it may be necessary to add a dedicated power supply ref. 346020 For the sizing of multi-family installations, refer to the General Installation Rules of the 2-Wire System Technical Guide