Contractor builds addition. Homeowner wires it - calls me to fix it.
At house entrance to the room - 1 gang box; 14/2 feed, 14/3 to 2 gang box on other side of room, 14/2 to light in center of room.
At outside entrance to room - 2 gang box; 14/3 from other side of room 14/2 to outside light
No feed for outside light! - need to get a feed over there! No access to attic or basement, and room is finish painted and trimmed.
I've looked at some X-10 solutions, but none seem to fit the bill. I'll end up with only one conductor available between the two boxes.
I thought there was an X-10 solution that would work as long as I had power to both modules, but can't seem to find one. Also, most of the X-10 stuff I've looked at is decora style - customer prefers "old fashioned" toggle appearance to match rest of the home.
Splice thru the feed to the outdoor box, put smart switches at outside box, put a one button on/off controller at entrance to room. The one button controller just needs 110, and your switches at the door will now have power. You end up with one spare at the front door from the entrance box.
As far as toggle style stuff. I have seen x-10 switches that fit the toggle opening, just the are push buttons, not toggles. Not a big user of x-10 so some one else may have more input.
What you describe is exactly how I thought of doing it, but..... Looking at the WS477 + CS277 pair, they need 2 wires to go between the modules, and I need two for the feed across the room - total of 4 - and I've only got 3.
Perhaps I'm missing something.... or picked the wrong module pair.
Well, you have enough conductors to provide a feed for the outside light and to run the inside light using a 'french' three way.....
Although, if you use 2 of the conductors on the 14/3 to bring power to the second box, then you could use diodes and normal three way switches to control the room light using the third conductor. I don't know if anyone makes UL listed devices to implement this, but it is similar to a puzzle posted here a while back. I'll leave the diode configuration as an additional puzzle
Would there be any Code issues with using a French 3-way arrangement to control a relay rather than switching the light directly? If not, and if you could find a way to fit the relay at the single-gang box without too much disturbance, that would work.
Failing that, use the diode arrangement to switch a relay. Use two conductors of the 14/3 to take power to the far location and wire the outside light as normal.
Tap the hot to the common terminal of the 3-way, then use a diode from each remaining switch terminal commoned to the remaining wire of the 14/3. One diode should be anode to the "traveler," the other cathode. Use a similar diode arrangement at the other end then take the common of that 3-way to your relay coil.
I'll leave it to the NEC experts to come up with any code objections to this idea.