You can replace an existing Home + Security video panel with a Classe 300 EOS: - Villa, single-family or two-family house: replacement without modifying the video intercom wiring - Housing cooperative: depending on the characteristics of your installation, it may be sufficient to replace the apartment panel or it may be necessary to add a special power supply, code 346020 For the sizing of multi-family installations, see the General installation rules for a 2-wire installation in the technical manual.