- Joined
- Dec 13, 2008
- Messages
- 105
- Reaction score
- 16
I have a fairly elderly MEM 8 way board with a 100A 30mA RCD main switch which takes out the whole board when it trips. About a month ago I put in a new circuit to an upstairs annexe in a garage (16mm SWA, TT rod and RCBO's in a separate CU). About 2 weeks ago the electricity board were doing some work so the power went on and off a couple of times, the last time it went off it tripped the RCD, I'm guessing this might have been coincidental but ever since the RCD will trip randomly, ranging from 3 days to 3 minutes,I have done a ramp test on the main RCD which is fine (trips at 29mA) and tested the circuits individually, again with no apparent problems. If I turn off one circuit (doesn't matter which one) this seems to be enough for the RCD not to trip, so I guess the problem is cumulative earth leakage??
I have disconnected as many external appliances as I can (e.g. Alarm box that was full of spiders outside) but still it randomly trips, I was wondering if the wise Sages of this forum had any experience of this kind of thing and if they cured it, what was the main culprit. I know ultimately I will have to change the board but it would be nice if I could fix this.
For info I am a Electrical Trainee and all this work will be signed off by a qualified spark.
Thanks for any help
D2E
I have disconnected as many external appliances as I can (e.g. Alarm box that was full of spiders outside) but still it randomly trips, I was wondering if the wise Sages of this forum had any experience of this kind of thing and if they cured it, what was the main culprit. I know ultimately I will have to change the board but it would be nice if I could fix this.
For info I am a Electrical Trainee and all this work will be signed off by a qualified spark.
Thanks for any help
D2E