How to do the separation of the switch and the socket
Use two lines, all the way to the switch, all the way to the socket
Multimeter with a buzzer, the buzzer on the file, without a buzzer, the use of resistance files; buzzer or resistance limit infinite, indicating that the wire, and vice versa is broken.
8 meters, 5 meters, 10 meters, 15 meters and 20 meters, etc
