I wonder where the "requirement" for low voltage DC comes from. At least here Europe/Italy there are bus-based systems from various manufacturers. Example: h

I wonder where the "requirement" for low voltage DC comes from. At least here Europe/Italy there are bus-based systems from various manufacturers. Example: https://professionisti.bticino.it/catalogo-prodotti/myhome-impianto-domotico/ https://professionisti.bticino.it/catalogo-prodotti/myhome-i... (not too bad in google translate) Basically normal wires (here 220-250 V AC) Live+Neutral+Ground and a signal (bus) 2 wire cable arrive to each and every electrical box/light point. Then you can install into the box any kind of device, switches, outlets, etc., and you can configure them. The bus wires (the protocol is called SCS): https://en.wikipedia.org/wiki/Bus_SCS https://en.wikipedia.org/wiki/Bus_SCS allows also (low power) 27 V DC trasmission. The protocol and compliant devices were first introduced between 1996 and 2000 and are by now well tested and reliable: https://en.wikipedia.org/wiki/OpenWebNet https://en.wikipedia.org/wiki/OpenWebNet Legrand also uses the same protocol: https://developer.legrand.com/documentation/open-web-net-for-myhome/ https://developer.legrand.com/documentation/open-web-net-for...