Is there an exception in the NEC for a low voltage wire to be terminated inside a 120V single gang electrical box? I thought the NEC allowed it as long as all the insulators on the wires were rated for the highest voltage in the enclosure. So if my 12VDC wire was rated for say 250V I would be good right?
I have a SM120X relay module connected to my smoke detector. It has a relay with isolated contacts where I want to connect a low voltage wire. The relay coil is powered by 120V.
Are there any markings I need to add to the low voltage conductors? I can see this would be dangerous if someone later connected these to high voltage not knowing where they are connected.