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:D Yes John I am disconnectong the N. I think I have pinned it down to one of two circuits. Not familar with that CCTV dome. Their all prety well the same these days. Normally 24vac or 110volts ac. Coax back to control and a pair of data leads. Everything is going digital these days. I am 55...

:D 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...

:( :( :( :( Well thats, that theory gone :( :( :( :( Tripped out three times today even when the suspect circuit disconnected. Back to the drawing board I guess. regards Roger

:D :D :D :D :D :D I think i may well have found the fault :D :D :D :D 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...

:D 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...

Come on softus, You need to place a bet here :D :oops: I will try yhis on the weekend guys. Roger

Softus, I like the joke PME, very good :D I apologies for the terminolgy, they are terms used in my field of expertise, sorry about that. And yes, I fully understand the calculations. I used the 2k ( oh sorry 2 kilohms, nb 2000 ohms) as an example, it's a figure I picked out of thin...

:( Ok Softus I will try an explain my question in a different way to you. The clue for you was the LARGE imbalance due to a SHORT circuit rather than a LEAKAGE : :( I am try to establish at what point an rcd would trip if there was dampness in an outside light fitting for example when it's...

:D BTW Adam, nice one on the two RCDs, i like that idea old boy 8) Roger

:D Well the rcd has not trip for 36 hours. I agree with you guys that some of the filters can cause a leakage, and believe me with all my electronic gear, 4 computers, ham radio gear there is more than the fair share of filters in this house. However, as I have had no tripping for 36hrs, it...

:D Thanks for your trouble both. Still learning :D My 100ma trip is definitely not an s type, thanks for the picture! I will try and borrow some equipment later on in the week. I have to go to London for a few days on business but will check it out on my return. The RCD has trip once in 24...

wow thanks guys. Securespark, Hmm not sure about S type, i do know its a 100 ma rcd current trip, not voltage. Enlighten me on the S type. I do have TT at the moment but awaiting PME I do not have any instruments to test trip times and ramp test. However I can probably get access to them...

:D Thanks industry spark, What do you think of my idea of re installing the 100ma rcd to every circuit except one and then feed that one with the 30ma trip. And yes it is the 30 ma rcd thats going. It's been fine now since 11pm last night. I suppose them will always be some leakage with some...

Intermittent faults continued------ In all intermitent faults we would try and re create the fault, it is much easier to find that way. Of course there is always the voice of experience who has come across the problem before or can suggest a quick way of...

Pressed the wrong key then, hadn't finished, more to follow Roger

Intermittent faults are always a devil to find as you know. If the fault was on a printed circuit board we would see if it's a mechanical problem by firstly taping the board to see if affects the operation. We may also flex the board to find out the same thing. If this causes the fault to...

Thanks for that, but its of very little use to me, as I say I am well versed in fault finding and if the fault was apparent all the time or if I had an unusual reading on one of the circuits I would be on the case straight away. What I was looking for is some advice from an electrician who...

:( Hi, i'm new to this forum, I am more of an electronic engineer rather than an electrician so will need some guidance please. I wired my house out 30 years ago and the standard installation with a Wylex CU fed with a 100ma rcd. The only time this would trip is if there was a genuine...