[Dave how did they get this reading testing the way has been described though?
/QUOTE]
I don't know for certain what these guys did, but as a global quick and dirty diagnostic test on single RCD systems I switch on lights - if filament lights are fitted anywhere this will prevent a voltage build up between L and N. I switch off at the main switch/RCD then test insulation at any available socket from L or N to E at 250v (prevents surge devices from kicking in).
Anything less than 0.25M sets alarm bells in my head - then start investigating individual circuits.
Just a thought - PAT test passes as 2M. Six items like this plugged in gives 0.33M insulation to earth.
---------- Post Auto-Merged at 20:34 ---------- Previous post was made at 20:12 ----------
Thought this might help
http://www.talk.electricianforum.co.uk/question-answer-board/890-upstream-residual-current-device-bs-en-61008-tripping-2.html
OK guys - I'm backing out of the discussion about N-E impedance testing : Haste did it the way they did it, and I'm quite sure they know what they are talking about, like I said I'm not arguing, especially as they say I've passed with flying colours.
It seems as though you all have your own ideas, and you all test things in different ways, and I appreciate there's more than one way to skin a cat (or was it rabbit?).
But it doesn't help my situation you all barging in and pointing fingers - what I need now are ideas on how this could be happening that I can bounce on the DNO, because I am beginning to think they have no idea how to be a DNO, or don't know what DN they are O for, if you get my meaning.
We have determined that another consumer is affecting my installation, and I have correlating data to prove this.
I have changed a perfectly good trip (according to the manufacturer and BS).
Haste have "passed" my installation. The DNO asked for the tests to be done, and they are paying for them, so I can't ask them to come and do "proper" tests, so if the DNO won't accept their findings, then they must ask them to revisit and do tests that they will accept.
So the
cause of the trips is external - i.e. there is a disturbance (an impulse) that is finding its way into my protective RCD device and causing a L-N imbalance of > 15mA
The DNO must now take responsibility for this and FIX IT !
We are now 5 months since the problem started - where will it end..?
---------- Post Auto-Merged at 00:40 ---------- Previous post was made at 00:25 ----------
its not apparent, it IS low,its NOT satisfactory, there is either a fault somewhere, or their woefully flawed method of measurement is not a proper test at all,
who exactly agreed to the limitations, and what are they?
well, its certainly NOT a test recognised by BS7671
me neither, its a flawed situation.
Riggy, as you so rightly quoted mr KME, if you havent found the fault you havent done enough testing,
except, it looks as though they may have found the fault and simply decided to ignore it,
0.35 , and there was me thinking anything under 0.5 wouldnt be acceptable........ :|
The DNO organised the test, the DNO payed for the test, and if the test wasn't to BS, then that is not my problem. I hear you all, if Haste are conducting tests that are not BS approved, then how can they have any credibility? My guess is they do the "quick, cheap, unapproved" test, then investigate further if the reading is lower than typical - and it's just a guess, so don't quote me.....
However, if the DNO accepts the test results, and actually does something to fix the problem, then i'll be happy.
