LED/PIR security light trips RCD

29 Nov 2005
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United Kingdom
Hi again all.

A little advice please?

I fitted a Screwfix sourced LED security light with PIR motion sensor. It is fitted in a hallway next to the electric cupboard with 3m of direct cable. I used a spare circuit breaker. On testing, as soon as the circuit breaker is switched on (and the security light 'initialises') the RCD pops out. Is there something I am missing about these LED lights, like surges etc?

Thanks in advance.

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Thanks EFLImpudence - I am certain you are right. Back on it on Tuesday so will confirm, but in the back of my mind I am certain I was using the LHS Neutral strip and a RHS MCB position of the dual box.

I suspect I will be reporting back complete with 'embarrassed' Emoji! My C&G Electrical Engineering 'ticket' seems to have deserted me...

:( This is the nearest I could find to an 'embarrassed' emoji !!

After EFLImpudence's comment yesterday, I couldn't wait to go back to go back to this, which I did this afternoon. And ! Yes, I had wired to the wrong Neutral bar. Don't ask me how!!

Thanks all for reading and thanks for the help offered. I now have a fully working PIR flood and the RCD's are still intact!!


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Of course @steviebobs - by creating a new circuit you run into all sorts of legal requirements. New circuits require notification to the Local Authority.

You should have used a registered electrician who could you’d have certified and notified the work for you. Alternatively you could have used an existing circuit.
Thank you Taylortwocities for your excellent point, excellently made. I would not normally respond other than to say thank you but a bit of background may help?

Firstly being a retired tradesman in the electrical industry I fully understand the need to keep our tradespeople in employment. I often employ my local tradespeople to do work that I am quite capable of doing myself. On this occasion, our local qualified electrician gave an estimate of £160 to supply and fit 3m of cable (in existing trunking) and a £20 lamp. Unfortunately this made my 90 year old neighbour's eyes water. So I stepped in. Less than £30 in 'parts' and less than an hours work for me. If a reasonable quote had been accepted by my neighbour I would not have got involved. And prior to the response 'well a pro would not have made that mistake', the electrical installation on a new house I bought failed it's test because of several wiring reversals, so even pros sometimes make mistakes.

Thanks to all on this site for assistance.

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