Recently I have helped install some wall lights, these are connected to a secondary consumer unit that powers everything related to the garden. We have used armoured cable to ensure that it cant be damaged and where the lights have been installed we have used the drainage pipe used on sinks to allow the fitting to be taken out if necesary. Here is a link to the lights we are using:
So here comes our problem, when you switch the lights on they work fine, but on switching them off the RCD on the secondary consumer unit trips. This doesn't always happen and so we are not sure why. We have checked that all fittings are dry and connections in them are correct.
If the lights are left on for a while it doesn't seem to trip the RCD, it only trips when they are turned on for a short while. It is as if they are creating some sort of a surge when they are switched off.
I am sure there is a simple way of fixing this, so please, if anyone knows a cure for this problem reply ASAP! :(
Hi I know the brick lights you are using and they are prone to damp problems due to condensation, which dries out after a while, don't know why they don't trip on switching on but a hair drier followed by some silica jel sachets cured our last set!
Thanks for your reply, but on installing them we used a hair drier to ensure that they were dry before putting the glass plate on front. I have looked into the problem a bit more and it seems that because they are 12V they have a transformer, this has a capacitor in it and when switching them off it discharges, creating an inbalance on the neutral and switching the RCD.
We have come up with another solution, which involves wiring it to an MCB on the unprotected side of the RCD in the primary consumer unit, but this means more SWA cable! and other things like water proof junction boxs. Apparently it can be solved using resistors or something, but I wouldn't know where to start.
Change of plan, rather than buy a new RCD, we have tried fitting a supression unit out of an old washing machine, this seems to have done the trick and everything is working fine now! Thanks for everyones help and suggestions.
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