Shelly Smart Home: 3- and 4-way Switching Relays and Dimmers

A bit more detail about 3- and 4-way switching including how and where to install input and/or relay devices. I'll also briefly talk about dimmers. NFPA 70 - NEC Free Online Access: https://link.nfpa.org/free-access/pub... Join this channel to get access to perks:    / @smartercircuits