How to get the bath bomb switch to the outside of the bathroom

The ground wire must be connected, for the sake of filial piety and safety.

Don't change the wiring of the original switch, make a small switch on the outside, remove the white wire connected to the lighting switch in the original switch box, extend it to a binding post of the outer switch, and connect the red line in parallel in the middle to another binding post of the outer switch. If you want to be able to control the high cover inside and out, then you have to change it to a double-open and dual-control switch.

It's to go back down the line in the wall. However, there is a problem to pay attention to, I don't know how your home electricity is connected, if the power supply of the lamp and the power supply of the bath bomb are separated, (the bath bomb is generally powered by the socket) then at least 5 wires should be threaded, one of which is the live wire of the socket, if the bath bomb and the lamp are the same power supply, then the string of 4 with the wire is OK, (generally there is a power supply on the switch). The gusset is installed first.

For four switches, there must be at least five wires (there should be one more ground wire, that is, six wires). If it is a dark wire, it is better to use 8 wires (or 10 wires), which will be convenient for maintenance in the future.

As for the installation sequence, it must be installed first. The person who installed this will know.

You can buy a certain length of bath bomb special line at the electrical store.