Thanks for the video. Why did you bring the 'switched hot' (from the second relay contact) back to the source panel? If the panels aren't beside each other, can you just bring that leg directly to the fixture?
Hi bro, you should consider into opposite direction (Source to conductor, with the help of coil (sensor) , conductor get energized) then it supply to the light. I guess so.
The low voltage is used to switch the relay. The solenoid coil inside the relay is rated for 24V low voltage, but the relay's switch contacts are rated for the higher 120V AC voltage. The relay acts just like a single pole switch that actuates with a 24V input instead of a person flicking a wall switch on. The contacts come together when the solenoid coil actuates, and allows the current to flow through to the lighting load. So, the wall switch, as he explains about 11:40 or so, it could be an automatic sensor instead of a manual switch. Besides the fact it is safer to have low voltage switching to your wall switches, it is also cheaper because the wiring method requirements are not as strict and you do not need large gauge copper wiring all the way to the wall switch.
