I am going to upgrade this to a Z-Wave enabled pair of 3-way switches with dimming, but both switches would require a neutral to function. Easy for switch #1, but since switch #2 is on a switch loop, it doesn't have a neutral available from the 12-3 I ran to it.
However, it is in a receptacle which has power for a different 3-way switch (to a different light) that is further along on the same circuit. What I want to know is, is it ok for me to draw power for the neutral from the line that feeds switch #3 (proposed wires illustrated in purple below)?
It SEEMS to me like that may be ok as it is just connecting to the same conductor at different places, but I would rather be safe than sorry and ask more knowledgeable folk before buying the product and just wiring it up.