DanMcIntyre
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- Mar 19, 2018
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Hi All,
First of all, I'm not a qualified spark so please excuse any lack of understanding of terminology. I consider myself competent and safe with electrics though.
A couple of nights ago we started experiencing trips on one of the RCD's in our split load CU for no apparent reason. The RCD could be reset straight away without unplugging anything or isolating circuits. Later that night I noticed Northern Powergrid guys kicking about. Basically, our street is fed using 2 phase cables and a neutral along the tops of the terraced houses and the other phase was blowing fuses. Every time they tried a new fuse to try and isolate the fault, one of our RCD's tripped, but not the other. They fixed the fault (there was arcing between phase 2 and neutral in a junction box above our extension) and the RCD stayed on for the rest of the night. The weather was shocking at the time, and lashing down with rain.
The next day, our RCD tripped another 3 times, and then the day after (yesterday) the RCD tripped another 3 times, and it tripped while I was at work today. Could there still be an upstream fault causing 1 of the 2 RCDs to trip? It seems too much of a coincidence for a wiring fault or faulty appliance within my house downstream of the RCD to have developed at the same time as a supply issue.
Any pointers on where to start troubleshooting are appreciated. I can borrow an insulation & impedance tester from work if need be but I don't particularly want to start dismantling the wiring unless I have to. I doubt the wiring inside the house all of a sudden went faulty with no tampering or alterations.
Cheers.
First of all, I'm not a qualified spark so please excuse any lack of understanding of terminology. I consider myself competent and safe with electrics though.
A couple of nights ago we started experiencing trips on one of the RCD's in our split load CU for no apparent reason. The RCD could be reset straight away without unplugging anything or isolating circuits. Later that night I noticed Northern Powergrid guys kicking about. Basically, our street is fed using 2 phase cables and a neutral along the tops of the terraced houses and the other phase was blowing fuses. Every time they tried a new fuse to try and isolate the fault, one of our RCD's tripped, but not the other. They fixed the fault (there was arcing between phase 2 and neutral in a junction box above our extension) and the RCD stayed on for the rest of the night. The weather was shocking at the time, and lashing down with rain.
The next day, our RCD tripped another 3 times, and then the day after (yesterday) the RCD tripped another 3 times, and it tripped while I was at work today. Could there still be an upstream fault causing 1 of the 2 RCDs to trip? It seems too much of a coincidence for a wiring fault or faulty appliance within my house downstream of the RCD to have developed at the same time as a supply issue.
Any pointers on where to start troubleshooting are appreciated. I can borrow an insulation & impedance tester from work if need be but I don't particularly want to start dismantling the wiring unless I have to. I doubt the wiring inside the house all of a sudden went faulty with no tampering or alterations.
Cheers.