How to install Google Nest Protect (Wired 120V) - YouTube Jul 24, 2015Nest Protect (Wired 120V) is simple to install, but there are some things to plan for like where to place it. We'll walk you through the entire process of choosing a location for your Protect and Visual Guide to Installing the Nest Protect Smoke and Dec 03, 2013Steve and I installed two Nest Protect smoke and carbon monoxide alarm from nest, and thought you might enjoy a visual guide to how it’s done. NOTE: Do NOT try this if you’re not already comfortable with identifying the correct circuit breaker and how to ensure that you won’t get electrocuted! If you’re not comfortable  Can I use a wired Nest Protect to replace one of the eight Can I use a wired Nest Protect to replace one of the eight current hardwired (cheap) smoke/CO detectors currently installed in my house? No, Nest uses a two wire proprietary harness and the interconnected communication between nest protect is done through WiFi communication either device to device or through a router. Show More.