I have an overhead utility room light that is controlled by two 3-way switches. I have added a light over the washer and dryer that I'd like to control from a single pole switch. I could only add the single pole switch to the non directly powered 3 way switch box. I am okay with the light only coming on with the one 3 way switch being powered on. How do I do this? The only thing I have found is how to make it power up when the overhead light is turned off by the 3 way I want to feed it.
Electrical – How to subfeed a single pole switch from a 3-way switch to control a fluorescent light
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Best Answer
That's not so clever. The problem is if the washer light is ON, and the utility room light is OFF, then flipping the farther 3-way will turn the washer light OFF and the utility room light ON, necessitating a trip to the other 3-way to put it right.
You need a major reassignment of wire functions in the 3-way circuit.
The 3-way box that feeds the lamp gets the "master" smart switch (or a 3-way and the relay). The "remote" smart switch goes in the other 3-way box. Some smart switches use a data-communication wire, that's what red is for. Others use radio or powerline-induction signaling, in that case red is unused.
Now there's always-hot and neutral in every box regardless of the topology of the 3-way system. Now you can add the second 1-way switch in the normal fashion for adding a 1-way.