I think I know the answers to this, but I am not sure.
I have a building that already has 3 interconnected 120-volt smoke detectors. I want to add two more to the system. I want them to all be interconnected so that if one goes off, they all go off. This is just a 120 VAC interconnected system with no battery backup.
To install one of the new detectors, I am planning on opening up the junction box for nearby existing detector, and from there run 14/3 wire to the new detector. And, where the 14/3 wire from the new detector comes into the existing detector junction box, I would just connect red to red, white to white, and black to black.
To install the second new detector, I am planning on opening up the junction box for a different nearby existing detector, and from there run 14/3 wire to the new detector. And, where the 14/3 wire from the new detector comes into that existing detector junction box, I would just connect red to red, white to white, and black to black.
Is that correct in terms of the wiring?
Also, if I cannot find two new detectors that are the same model or compatible with the 3 existing detectors, I will just buy 5 new detectors and use them.