V
Vol
Hi Pete999, here is a partial screenshot of a page of the doc.
V
Vol
Pete999 - Domestic EIC Report, 2 x snapshots (redacted)
V
Vol
The only one i can see on the report just above the testing schedule info I sent, Measured Ze: 0.65. The other parameters you describe are not included on the report that i can see, other than on the testing schedule info I already uploaded. What I mean is there isn't any box into which any of these test values could be written, unless I'm just overlooking them. Are you sure that this particular form requires a test result rather than just confirmation that a test was or was not done? I can't see any boxes for these values, it's not that the electrician has left them empty.
V
Vol
Other values I can see:
Nominal frequency: 50Hz
External earth fault loop impedence Ze (2/3): 0.57
Prospective fault current (2/3): 0.5
the report also states that he used for testing equipment, a Kewtech KT64 (might be 84, hard to read)
Nominal frequency: 50Hz
External earth fault loop impedence Ze (2/3): 0.57
Prospective fault current (2/3): 0.5
the report also states that he used for testing equipment, a Kewtech KT64 (might be 84, hard to read)
When changing a consumer unit I would expect to test and record R1+R2 values for radial circuits, r1, rn, r2 and R1+R2 values for ring final circuits. Insulation resistance for each circuit. Zs for each circuit and RCD trip times for each RCD/RCBO on the board.
These prove continuity of the protective conductors on the circuit (R1+R2) and go a long way to proving the correct polarity of the circuits, end to end continuity of ring final circuits (r1, rn and r2), give an indication of the condition of the cables and demonstrate there is nothing on the fixed install that might trip the RCDs (IR), demonstrate that the circuit can meet the requirements to achieve the maximum disconnection times required by BS7671 (Zs) and that the RCDs will operate in a manner that should save your life (RCD trip times).
Without these tests you can't say the installation is safe and in my opinion, he should not really have signed it off.
These prove continuity of the protective conductors on the circuit (R1+R2) and go a long way to proving the correct polarity of the circuits, end to end continuity of ring final circuits (r1, rn and r2), give an indication of the condition of the cables and demonstrate there is nothing on the fixed install that might trip the RCDs (IR), demonstrate that the circuit can meet the requirements to achieve the maximum disconnection times required by BS7671 (Zs) and that the RCDs will operate in a manner that should save your life (RCD trip times).
Without these tests you can't say the installation is safe and in my opinion, he should not really have signed it off.
V
Vol
Not sure how to download files. However, here is a link to almost exactly the same form, I say almost because the layout of Scheduled Inspections has changed but not the content I don't think. This is the form. If you can show me where to see where those values should have been written then thanks.
http://www.electricaltestcertificat...estic-Electrical-Installation-Certificate.pdf
http://www.electricaltestcertificat...estic-Electrical-Installation-Certificate.pdf
V
Vol
I would be very surprised if the RCD trip times were .2ms and .3ms as those results suggest. Especially as it appears the result show 5 circuits, but there appear to be 6 in the board spread equally across 2 RCDs.
to be fair, i'd put that down as a typo.
V
Vol
Just been looking at a forum on the ------.org website. Some bright spark says that the average pass rate is 60%? Not sure about the significance of that except I guess that not all electricians are right all of the time and then they forget! This has been a case in point! My electrician needs a refresher course!
Thanks for all the help I did get. Many of the early answers were right on the button and were as I thought: not overly dangerous except in specific conditions and probably the meter tails had been swapped over. I actually emailed over the weekend to British General, the manufacturer of the CU, and this morning they answered saying much the same.
I've tried to show willing in response to the help I did get by showing as much info from today's resolution as I could. I'm done now. Obviously not perfect, but then again, who is?
As for those that jumped on this bandwagon started by Midwest "Are you thinking what I'm thinking and probably what everyone else is thinking, or am I being just toocynical suspicious", please adopt a more constructive, more friendly approach next time and please change your motto from Guilty Until Proven Innocent! 
Cheers!
Thanks for all the help I did get. Many of the early answers were right on the button and were as I thought: not overly dangerous except in specific conditions and probably the meter tails had been swapped over. I actually emailed over the weekend to British General, the manufacturer of the CU, and this morning they answered saying much the same.
I've tried to show willing in response to the help I did get by showing as much info from today's resolution as I could. I'm done now. Obviously not perfect, but then again, who is?
As for those that jumped on this bandwagon started by Midwest "Are you thinking what I'm thinking and probably what everyone else is thinking, or am I being just too
Cheers!
V
Vol
...pass rate for 17th Edition exams...
S
Specialist
There we go, you naughty boys & girls. Consider yourselves duly chastised, You must try harder to be Friendly & Helpful in future.
Forget the fact that over the course of a year, you freely give up your time to help probably hundreds of people and do so in a Friendly, Courteous & often Humorous manner.
Oh yes: Stop being so Cynical and Suspicious
Forget the fact that over the course of a year, you freely give up your time to help probably hundreds of people and do so in a Friendly, Courteous & often Humorous manner.
Oh yes: Stop being so Cynical and Suspicious
T
Toneyz
Vol, I am glade after all this time this has been resolved for you however I must say that on the electrician discovering the reverse polarity after installation of the consumer unit being that the meter tails are so easily seen this would and could of been spotted immediately and would taken a couple of minutes to rectify its the fact that you was left for over a week like this. I hope we have all learnt something from this.
O
Octopus
I simply don't believe that ANY BODY practising as a Spark can "miss" reversed polarity on the testing - I always test the old board then the new board and my Metrel won't conduct the Ze test with reverse polarity.
Dare I ask how much you paid and whether you received an invoice?
Dare I ask how much you paid and whether you received an invoice?
Some circuits are run surface and should be rectified in future ?
Whats the world record for speed of reaction of a 30 m/amp Rcd ?
200 M/ohm across the board seems like a very common reading for insulation resistance of well used installations these days
The consumer unit is a 11 way,the test schedule lists 5 ways,the 2 Rcds seem to have 3 circuits each ,decisions,decisions,try as I will,I just can't make sense of what has been produced
Whats the world record for speed of reaction of a 30 m/amp Rcd ?
200 M/ohm across the board seems like a very common reading for insulation resistance of well used installations these days
The consumer unit is a 11 way,the test schedule lists 5 ways,the 2 Rcds seem to have 3 circuits each ,decisions,decisions,try as I will,I just can't make sense of what has been produced
I've never got rcd test results that low hahaSome circuits are run surface and should be rectified in future ?
Whats the world record for speed of reaction of a 30 m/amp Rcd ?
200 M/ohm across the board seems like a very common reading for insulation resistance of well used installations these days
The consumer unit is a 11 way,the test schedule lists 5 ways,the 2 Rcds seem to have 3 circuits each ,decisions,decisions,try as I will,I just can't make sense of what has been produced
0.02 and 0.03 of a second
Edit
Or is it 0.2 and 0.3 of a second I can't make it out?
S
Specialist
Says .2ms @ x1 & .3ms @ x5
Last edited by a moderator:
S
Specialist
T
The Ghost
Tails in photo don't indicate that. Personally I don't like exposed live bus bars either.
Just pointing out that either it was a typo (very likely) or the report is a fudge
O
Octopus
Corrected that for you...
Thank you Murdoch, kind of you.
Can you provide those snap shots Vol?
I've been reading the posts again, and just read Tel's at #116. 'the tails entering the CU appear to be hard up against the metalwork. where's the grommet', I can't see any grommet strip either, but that's a simple fix.
However whilst studying that picture, I can't see the earthing conductor (difficult to tell from the pic) entering the enclosure through the same cable entry as the tails, it should do, but again a simple fix. My only concern is I can't really see an earthing conductor in the CU (again, difficult to tell from the pic). It look as if the service head is somewhere above the CU, do you have a pic of that Vol?
Did you find out about the Building Warrants?
However whilst studying that picture, I can't see the earthing conductor (difficult to tell from the pic) entering the enclosure through the same cable entry as the tails, it should do, but again a simple fix. My only concern is I can't really see an earthing conductor in the CU (again, difficult to tell from the pic). It look as if the service head is somewhere above the CU, do you have a pic of that Vol?
Did you find out about the Building Warrants?
V
Vol
Hi Midwest, please refer to my post #135. "I've tried to show willing in response to the help I did get by showing as much info from today's resolution as I could. I'm done now." What part of "I'm done now" don't you understand?
Hi, victim of a careless "electrician".
This is one of the most serious faults to have been left with you.
Do you know why?
This is one of the most serious faults to have been left with you.
Do you know why?
delano
-
I had this scenario after doing a full inspection and testing of a property last month. The test results were good and I installed a new split amendment 3 CCU. I then did some tests after the install and noticed I had L-N reversal at all sockets. I then rechecked my wiring/polarity at the board; all good. I eventually established that one of the main RCD'S was faulty. Considering it was brand new, I was surprised by this. The board was an MK Sentry,brand new. Theses boards are being sold at a much cheaper price than their main competitors but I won't be buying them anymore.Hi there, I'm a newbie to the forum. I'm an ordinary senior citizen householder but while not an electrician, I do take notice and read up on all the stuff the electricians are doing in my house. I have just had a modern, metal consumer unit installed after the removal of the old traditional fuse box. The installation went pretty well with very few curses!
As a final check before leaving, the electrician inserted a socket tester. In every location tried, the socket tester showed L&N Reverse. I bought s socket tester and confirm the same readings: L&N Reverse. I haven't checked every single socket but that is the pattern.
One problem is that I have no way of telling if the old fuse box situation would have given the same L&N Reverse readings, ie did the electrician change anything or just carry on an existing (hidden) error?
Firstly, is this in any way a dangerous situation given the RCDs are quite happy? If dangerous, what should be done immediately?
Secondly, how could this reversal have occurred? The electrician simply reinserted the live and neutral cables appropriately as they were removed. The meter tails were changed cos the existing were only 16mm. Could the tails have been reversed somehow?
Anything else you guys can suggest?
Thanks for reading the newbie panic post! I would appreciate any input, thanks..
try the BG boards. similar price to MK, but better quality and better looking. ( a bit like me, i suppose
).
What was the fault on the RCD?
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