It is possible to replace an existing Home + Security video panel with a Class 300 EOS: - For villas or single-family and two-family homes: replacement without modifying the video door entry system wiring - In multi-storey buildings: 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, reference 346020 For the design of multi-storey installations, consult the General Installation Guidelines in the 2-Wire Systems Technical Manual.