So like me you thought it was OK to plug a 10amp device into a 15amp outlet.

[Franco Cozzo]

For the record, circuit breaker protects the wiring in the wall, RCD protects humans.

RCBO is a combination of both circuit breaker and RCD, when you pay for a switchboard upgrade they usually put RCBOs in to replace old fuses or circuit breakers.

Then you might have to pay extra when they trip all the time diagnosing issues with old appliances and earth leakage problems

RCD monitors what's going in/out of the active and neutral wires, so if there's current going out the active and it's not all coming back through the neutral wire we've got a human in the circuit and we better cut the power.

I think that's the gist of it anyway, real sparkies here to confirm.

There's also sketchy bullshit with old houses and earthing through pipes in the ground that puts the fear of God into plumbers with earth faults, people getting tingles from taps and plumbers cutting pipes and becoming part of the circuit when they grab both sides of it or something.

How good is electricity, kills people and you can't see it, you can certainly feel it though