What does the orange wire connect to?
You’ll find black and red or orange wires connected to 220-volt appliances like electric water heaters, well pumps, and older electric ranges.
What do I connect the dimmer wire to?
With conventional dimmer wiring using NM cable, a NM cable supplies line voltage from the electrical panel to the dimmer outlet box. Another NM cable connects from this dimmer box to the light fixture box.