I have an indoor switch which is connected to an outdoor light socket. The switch is wired with all 3 brown wires: 2 going into COM port, and 1 going into L1. How do I know which wire is which? Outdoors, there are 4 wires coming out: black (neutral), brown (live), blue (switched live?) & copper (earth). How do i confirm if these wires are connected correctly to the switch?