Quote Originally Posted by David48atTD View Post
It seems he hasn't turned the main switch off. Main switch off, everything (should be) off.

If the "safety breaker box" is the translation for an ELCB or circuit breaker for the 'Power' circuit, he turned the wrong circuit as 'usually' the fans are connected through the lighting circuit.

That 'pen' New showed is the basic standard for a 220/240 volt system.

RIP
I've seen circuits on a room by room basis in Thailand rather than split into lighting and power circuits. It's okay for most as long as 2.5 is used throughout, although kitchen and bathrooms have separate rules.
I guess no rcd (critical) and isolated via cb not main consumer switch. However, I have seen the main power supply run through the roof to the consumer unit, which is a real gotcha if you are unaware.
I never use the screwdriver test thingy. If I don't know the wiring, I pull out from the meter on the lampost, such is my trust in Thai electricians.