ᐅ Preparation for Electrician: Insulation Resistance Testing

Dear forum community,

Something incredibly frustrating happened again. I could have cried…

While installing lights in our new build yesterday, something unusual occurred. Even though the circuit breaker was switched off, the upstream RCD (residual current device) tripped just as I was on my way to the breaker. This happened neither directly while drilling/screwing nor after turning the breaker back on. I can’t rule out that I may have hit a cable during installation. My main goal now is to check the safety of the cables running through the ceiling without having to open it up. From what I’ve read online, a smoldering fire is almost inevitable if I continue to use the (still functioning) cable…

I have already contacted three electricians and am now waiting for their responses. My question to you: Is it sensible to perform an insulation resistance test? Or would calling an electrician at this point be like using a sledgehammer to crack a nut? Has anyone had experience with this? Are there other options? Would the RCD trip again if there was an exposed cable before a dangerous situation occurs?

Thanks to everyone who contributes…

Best regards,
Björn