“So you want an automated hardwired light switch, but you’re not sure where to start. Well you’re in the right place. The most common requirement of any hardwired automated light switch is a neutral wire. Yes, there are a few…(read very, very, very few) switches that don’t require a neutral, but those will limit you to incandescent only.
The switch still breaks the circuit, but in this case the smart switch can tap into the neutral wire to keep power flowing through the switch - the electronics in the switch still break the circuit to the light, but the switch maintains a circuit so it is always receiving power. Here is a diagram of a standard switch with a neutral wire:
I'm having trouble installing a WEMO wall switch. The light I want to use it on is a single on/off switch, not a 3 way switch. When I remove the face plate, the neutral wire is wired to the light switch on its own. It's not connected to the other neutral wires that fit in the multiple light switch housing.
The only way to be absolutely sure that you have found a neutral wire is to check the voltage (110V/120V) between the white wire and the "hot" (usually black in color) wire in the box. In a standard switch/dimmer, the "hot" is using one of the two wires connected to the switch.
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The neutral wire provides continuous power to the Leviton smart light switch or dimmer and is required to power the communication radio, keep time, and control the load.
How Do I Know If I have A Neutral Wire for Automated Switches. ... If you don't want to replace a switch, you can now simply replace your light bulbs with the INSTEON LED Bulb. Now you don't have to worry about re-wiring if you don't have to. ... When in doubt, hire a pro to find out if you have neutral wires in your switch box. If necessary ...
Kasa Smart Light Switch by TP-Link - Needs Neutral Wire, WiFi Light Switch, Works with Alexa & Google (HS200) - - Amazon.com
What to do if You Don't Have a Neutral Wire. If you have two wires in the box and they both connect to the same switch, one is always carrying hot and the other carries hot when the switch is turned on.
I thought white wires were not suppose to be connected or attached to a light switch, you said! Well most of the time you are correct in your thinking. But sometimes a white wire is in fact ...