Light circuit suddenly trips and cannot take more than 20 watts

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CK Electrical

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Oct 11, 2015
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Location
Essex
Hello all, just joined this site and after some help. I have not come across this before. We are currently refurbishing a house, new cables are being fitted as the work progresses and connected to existing light circuits that we have not yet got to as the refurbish continues. All electrical circuits have been fine. The particular light circuit in question has had all the new cable tested and is good. For some reason, 3 days ago the circuit tripped and the builder on site could not reset the RCBO. (All circuits are on their own RCBO's). I went yesterday and started to work through the circuit from where the builders had been working just in case they had gone through something, but all was good. To cut a long story short I removed a number of cables from an Ashley brown junction box and connected that all in Wago connectors for ease, The circuit held when the RCBO was reset, however, as soon as I turned a switch on that fed halogen lights, it tripped again and would not hold until the switch had been turned to the 'off' position. Changing lamps for LED's and again it held, but as soon as I added further LED lamps that took the current to over 20 watts, the circuit tripped again. Basically now, the circuit that quite happily allowed four 40 Watt halogen lamps to be switched on along with other LED lamps, not will not allow anything more than 20 watts. I'm completely stumped as to why this has happened. I have checked the RCBO by putting the circuit cable in to the adjacent 6 amp RCBO, but that one does exactly the same. Has anyone got previous experience of similar situation or advice on where to take it from here?

 

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