[absolutelynobo]

Cool how you use the acronym RCD and don’t expand it anywhere. Or any of the other homelab acronyms you used!

[halper]

"Residual current device". It detects current leaking to ground; essentially it prevents you from killing someone by throwing a toaster into the bathtub.

[tiagod]

RCD is not a homelab acronym, its a type of circuit breaker.