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Does Smart switch need neutral?
Smart switches need to stay powered up all the time, which is why the neutral wire is critical. The neutral wire allows the completion of the circuit and the switch to have power even when it’s turned to the off position when you want the lights off.
Will a light switch work without a neutral wire?
In terms of a home’s power flow, the neutral wire provides a return path for currents essential to most modern U.S. electrical codes. Combined with a power source and ground wire, you have the makeup of a contemporary light switch, but earlier switches operate without the neutral.
Are there any smart light switches that don’t require a neutral wire?
There are dimmable smart switches on the market that can be installed without a neutral wire. The Caseta switch works with Wink and the Caseta Smart Bridge (the Caseta Smart Bridge allows the switch to interface with Alexa, Apple HomeKit, and Google Home).
Why do some switches not have a neutral?
What is a Neutral Wire and Do I Have One? The reason that some smart switches won’t work in this configuration is that the switch is breaking the circuit when it is off so power is not flowing through the switch. Smart switches require a source of power because they are always communicating with a hub.
What kind of power supply does a smart light switch need?
Considering a smart switch based on a power greedy WiFi ESP8266 ( 800mA spikes and 100mA on idle, @ 3.3V ), there is the common situation to have the neutral wire missing from the wall switch box (left with 2 hot wires, maybe some earth wire that I don’t want to consider in any way).
How does a smart light switch work without a neutral wire?
The key to creating a smart switch that works without the neutral loop is to make R1 the perfect resistance. R1 needs to restrict the current enough so that the light bulb doesn’t turn on when the switch is off. At the same time, it needs to let enough current through so that the switch can power itself.
What kind of wire should be used for a light switch?
The third wire should be the ground wire and is usually colored green or bare wire. If you want smart control of your lighting, and your home has switch boxes with no neutral, you have 4 options: 1. Buy a smart switch that works with no neutral
Can a 2 wire light switch be retrofitted?
In order to design a smart switch to retrofit the existing 2-wire installation, it’s either Method 1: putting a rechargeable battery inside the switch to supply the power to the MCU or Method 2: thinking out of the box to make MCU work with the 2-wire wiring system. The method 1 is relatively easy.