Random Tripping on new consumer unit
- Thread starter gw3xjc
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I'll put 49p on 7.9K both ways. 
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I have had a similar problem and have isolated it down to one ring. The problem I have is that the ring has been inspected and it appears to be in tact. All wiring is new...all connections good...So why the hell is it tripping? And it's raining...hmmmmmmm
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Hi Guys, i have not had a chance to do the neutral test this weekend. However, the rcd has not tripped out for 7 days. It's been fine dry weather for 7 days, today it rain and the rcd fellover. I hope that the theory of mine that the two outside 500watt halogens are causing the problem, there is nothing else outside to be affected by the weather. I will renew both and seal them.I will let you know how I get on.
Happy bonk holiday
Roger
I think i may well have found the fault There was an old junction box that I had forgotten about. I think what may have been happening is that there are some RSJ's above this junction box which the damp air would condense on, then a drip of water would drop between live and earth momentarily and cause an earth leakage. By the time i would measure it with a meggar the drip of water would have continued on its way which would explain why I could not measure anything. It's the only explanation I have right now. When it was dry weather I did not have a problem. Its tripped out 3 times in the last two days with the wet weather.
Thanks for all your help guys with this problem, i have learned a lot.
regards Roger Luke
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metwou2002 said:
Damp in a box on an external wall?
A JB under the floor sitting in a puddle?
Sorry! Didn't read the last post before this one...
consider fitting RCBOs,even if you only buy one,and swap it between suspect circuits.
How many circuits are on the RCD side?
Do you have any spare ways on the other side?
Can you post a pic of the CU?
As it seems to coincide with damp, have another look for signs of leaking roofs or gutters, and see if there are any mouse-gnawed cables lying on a damp oversite under the floor.
What circuits do you have outside the house?
How many circuits are on the RCD side?
Do you have any spare ways on the other side?
Can you post a pic of the CU?
As it seems to coincide with damp, have another look for signs of leaking roofs or gutters, and see if there are any mouse-gnawed cables lying on a damp oversite under the floor.
What circuits do you have outside the house?
It is tt at the moment but will be PME on Tuesday.I am disconnecting whole circuits at a time now. I have an "out house" and have disconnected that and sucking and seeing. There are four circuits from the Cu, it's difficult to take a picture at the moment. Good idea in getting an RCBO's, that something I hadn't thought of.
I will let you know how I get on. I guess it is dampness somewhere. When we get fine weather all is well. It's been a learning curve for me. Thanks for all your help and guidance guys. If you want to know about CCTV I'm your man.
regards Roger.
gw3xjc said:If you want to know about CCTV I'm your man.
regards Roger.
OK then, Why doesn't my VCL speed dome work?
you are disconnecting the Neutral as well as the Phase conductor, aren't you? Quite likely you have an N-E fault (P-E are easier to track down as it is more often than not enough to switch off the MCB)
Be aware that you may have small faults in several circuits which, together, are sometimes enough to add up to about 30mA. RCBOs are the best way of getting round them.
Watery appliances like washing machines and kettles are the usual culprits, and things in damp outhouses. Also outdoor lights supplied from an FCU on a socket circuit.
Be aware that you may have small faults in several circuits which, together, are sometimes enough to add up to about 30mA. RCBOs are the best way of getting round them.
Watery appliances like washing machines and kettles are the usual culprits, and things in damp outhouses. Also outdoor lights supplied from an FCU on a socket circuit.
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