Ring Main Continuity Test Help

clegg333 · Apr 17, 2008

Hey I Was Wondering If Anyone Has Any Diagrams To Help Me Understand And Conduct The Test It Would Be Much Appriceated Thanks
P.S Sorry About The Bad Spelling And Grammer

wayne · Apr 17, 2008

its all in the osg read page 69-71 what dont you understand?

Cirrus · Apr 17, 2008

It's also in Guidance notes 3 IIRC

Shakey · Apr 17, 2008

yeah, try and be specific and we can tell you exactly, but really, as the guys said, its laid down in clear step by step stages in the OSG and GN3

adamh · Apr 17, 2008

breaker off socket taken off 3 continuity tests L - N - E respectively breaker on earth loop

Shakey · Apr 18, 2008

adamh said:
breaker off socket taken off 3 continuity tests L - N - E respectively breaker on earth loop

Adam do you not cross connect L-N, and then L-E to get your R1+R2, like what the book says?

and what about your IR tests

oh, and I like the contravention of the EAWR's with your earth loop, nice touch

clegg333 · Apr 18, 2008

Well Im On The 2330 And Yesterday We Were Told We Needed To Learn How To Do The Test Because They Didnt Want Us Going In To Next Year Not Know It. We Were Given A Run Through On How To Do It But Alot Of Us Failed To Understand The Diagrams Were Confusing And He Completely Lost Me With The R1,N1 ect... Was Just Wondering If You Guys Could Explain Better.

LukeScotty · Apr 19, 2008

bit late to answer u fully, will edit this post tomorrow, stay put, btw do you own any of the reference guides above??

solo2771 · Apr 19, 2008

Hi I am doing the 2330 level 2 and we have to check our ring circuits by :
first before connecting to the consumer unit we cross connect lives to earths then using a socket tester and meter check continuity between all the live and earth terminals and record them ( R1+R2) then disconect the cross over conections (L&E). we then have to do insulation tests at 500v across L and E, L and N and N and E.

From what I remember (sure if I am wrong someone will tell me)
Paul

Malcg · Apr 19, 2008

Hi Clegg
Have you got the NICEIC Inspection, Testing and Certification book (£25) - very useful for testing and recording results?

Pages 224 to 227 attached http://aquae-vitae-electrical.com/htdocs/images/ContinuityTesting.pdf

This is dead testing - so main switch off - no just MCB

What you are trying to do is find resistance of the ring Live (phase), the ring Neutral and the ring CPC (ratio of 1:1:1.67 approx).

Then make a figure of 8 by cross-joining ring Live and Neutral at CU - this result is approx half R1 or RN.
Now do same with ring Live and ring CPC and test at various sockets in ring circuit (no need to remove accessories. As you can see from STep 4 you will get (R1 + R2)/4. This also confirms dead polarity.

good luck

Shakey · Apr 19, 2008

Malcg said:
Hi Clegg
Have you got the NICEIC Inspection, Testing and Certification book (£25) - very useful for testing and recording results?

Pages 224 to 227 attached http://aquae-vitae-electrical.com/htdocs/images/ContinuityTesting.pdf

This is dead testing - so main switch off - no just MCB

What you are trying to do is find resistance of the ring Live (phase), the ring Neutral and the ring CPC (ratio of 1:1:1.67 approx).

Then make a figure of 8 by cross-joining ring Live and Neutral at CU - this result is approx half R1 or RN.
Now do same with ring Live and ring CPC and test at various sockets in ring circuit (no need to remove accessories. As you can see from STep 4 you will get (R1 + R2)/4. This also confirms dead polarity.

good luck

Malc, maybe a typo

r1+r2 / 4 = R1+R2

where r1 = line loop resistance
r2 = cpc loop resistance

james hayes · Oct 5, 2009

hey luke wasnt "if u build it they wil come" off a very old film? something about building a baseball field wi kevin costner????? cant remember what its called tho!!!!!

wel guys i have my402 exam in 6 wks n although the pysical side of it (installation of consumer unit, light 2x 2way switches, intermediate switch and 4 dbl ac outlets) isnt a problem im somewhat concerned about the working out of voltage drops across the system!!!!!! anyone any advice please??????