this post was submitted on 31 Oct 2023
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Home Automation
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Home automation is the residential extension of building automation.
It is automation of the home, housework or household activity.
Home automation may include centralized control of lighting, HVAC (heating, ventilation and air conditioning), appliances, security locks of gates and doors and other systems, to provide improved convenience, comfort, energy efficiency and security.
Warning: Working with electricity can result in injury, property damage, or even death if it is not done properly. Please keep this in mind while assisting others. If you are not sure about what you are doing, hire a licensed professional.
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If by 3 way switch you mean an intermediate cross over so that you have 3 switches in a hallway which all control the same light?
In that case the intermediate cross-over switch will always have at least 1 live.
The problem is, it changes between the two. Every 2 way switch, including cross over intermediates have 1 live, 1 dead port. How they work is toggling between the two.
If the light is on, then all switches in their current position are connecting up the same live. If you change any one switch the light goes out as that switch has by logical expansion switched over to it's "dead" feed. The really interesting thing is, it doesn't matter how many 2 way switches you configure like this, switch ANY one of them will change the state of the light.
In practical terms, if you are just trying to power a smart device, you might be better considering a parasitic device and by 2 coils, put one on each "in" live. One will always be live and power will be flowing through ONE of them when the light in on.