@Carl it is on the live side. I can track my two 120V back to the fusebox. Also, it is the only box with a neutral and travelers going back out. The weird thing is that my other switch has my common...

I installed my HS210 switch on the first switch coming from an old fuse bock that has been since connected to a separate breaker panel. The box had the hot and neutral coming from the fuse box, 3...