I'm preparing to install a MS-OPS2 sensor light switch into my bathroom in a 1979 home. The instructions say this switch requires a ground wire, but I don't see any bare copper wires in the switch box:
There are unused neutral wires and what looks like two brown wires, with one brown wire going to the fan switch. Can this brown wire by the ground? Also, would it be okay for me to connect both the green/white and bare/ground wires from the Lutron to the switch box's neutral wire?