Breaker has tripped for 1st floor lights. RCD flips off when I try to turn it back on and arcs. Help?

Hi all,

I’m going to preface by saying I’m panicking a bit and am a total amateur. This evening, I noticed the breaker for the 1st floor of our house’s lights had tripped. I tried to flick it back on, and there was a bright blue arc in the consumer unit and it flicked back off of course, and tripped the RCD. When leaving the 1st floor light circuit off, the RCD goes back on fine.

3 days ago, I drilled above a light switch in one room on the 1st floor, as that’s where the thermostat is located and I was removing the old thermostat and installing a new one. Firstly, I know this was stupid in hindsight and know I shouldn’t have - I’ll learn from this of course.

Is it the issue likely related to the drilling, given that the tripping has occurred 3 days later after using the lights on the first floor/in that room several times in the last few days? There were NO obvious signs when I did the drilling that I’d hit any wires - nothing tripped, no smell, noise, etc.

Please could anyone advise? I’ve kept the breaker for the 1st floor lights off of course & contacted an electrician - do I need to be imminently worried if the breaker remains off in the mean time before I can get an electrician to assess?

Thanks everyone - again, I know the drilling was stupid, this is our first home we only recently moved into.

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u/randomnature_ — 5 days ago
▲ 14 r/SonyBravia+1 crossposts

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u/randomnature_ — 18 days ago
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u/randomnature_ — 4 months ago
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u/randomnature_ — 4 months ago