A RCD is explained here, https://en.wikipedia.org/wiki/Residual-current_device you don't really need one, but if you or your family accidentally electrocute yourselves, which is easier then it sounds, and the crazy stuff Thais do around power would make it more likely, then it will most likely save your life.weitling;290908 said:I really don't know much about power so i followed what the electrician told me to buy. we have an earth connection in cobber that goes 2,5 meter down in the earth that we have 2 times. But i can ask him.
Given Thai power outlets don't normally have a ground. ie 2 point plug, then I will say its a worth while investment.
They are normally wired up after the main switch in the circuit breaker (the joined switch on the left in your photo), so you maybe able to wire it up after this switch.
Maybe that's what the space is for as it would normally go there.
Normally the best way is to purchase a circuit breaker with one already fitted. Something around the size you have would cost around the 3000baht mark.
As I said its rare to find one (a RCD) used in houses in the village.
At least he used the correct sized grounding rod (copper pole in the ground).