Ring Final Tests

[scott 123]

testing a ring final today
end to end test L 0.24 N 0.24 CPC 0.37
figure of 8 L1 -CPC 2 L2 - CPC 1 0.25
L1 - N 2 L2 - N 1 no reading
IR >999

cant figure out why open circuit on figure of 8 any answers?

 

[Pete999]

Were you carrying out the tests as per video

 

[scott 123]

yes

 

[Wilko]

Hi - I'd just repeat it then. I have picked the wrong wire out of a bunch more than once

 

[scott 123]

Checked and double checked correct cable. same results

 

[Pete999]

So you have done your r1, r2 and rN and got satisfactory results, yes? I would hazard a guess that you are either making a mistake in connecting the figure of 8 or you have dodgy connections when taking readings

 

[scott 123]

Gonna try again

 

[Lucien Nunes]

Check your instrument, test leads and adaptors for possible intermittent connections. Otherwise what you are claiming is that when connected in parallel the L & N (measuerd OK at 0.24Ω) both went open circuit at the same time. Also obviously the L/CPC reading was too high.

 

[Deleted member 72666]

When you say "no reading" does your tester not carry out the test or is it a value of infinte resistance? Btw which tester are you using?

 

[scott 123]

When you say "no reading" does your tester not carry out the test or is it a value of infinte resistance? Btw which tester are you using?

Open circuit megger 1720

 

[scott 123]

Check your instrument, test leads and adaptors for possible intermittent connections. Otherwise what you are claiming is that when connected in parallel the L & N (measuerd OK at 0.24Ω) both went open circuit at the same time. Also obviously the L/CPC reading was too high.

Sorry meant 0.15

 

[Davisonp]

On my tester (Megger 1730), Continuity is always measured between the same two terminals (Red and Green), so to test continuity in a socket between live and neutral I need to change the tester terminals and plug the Neutral of the plug adapter into the terminal usually reserved for the CPC (Red plug lead into red on tester, and blue plug lead into green on tester). I hope this makes sense but did you change the inputs to the tester for failed test?

 

[telectrix]

hang on. in the op you say you're not getting a reading L1 N2 etc. well, you should not. you are cross connecting the L's and cpc's so you should only get readings between these. the N's are not relevant.

 

[Midwest]

hang on. in the op you say you're not getting a reading L1 N2 etc. well, you should not. you are cross connecting the L's and cpc's so you should only get readings between these. the N's are not relevant.

Think OP is referring to 'step 2' of RFC test, cross connection of live & neutral conductors to confirm correct connection of conductors at each outlet. According to his figures he should be obtain a reading of 0.12 ohms (0.24+0.24/4). Or have I misinterpreted both you & OP?

OP was your reading for r1+r2/4, 0.24, obtained at the CU ends. As Lucien said it's high, should be around 0.15ohms, although the reading for r2, should be around 0.40oms without parallel paths.

 

[Midwest]

OP was your reading for r1+r2/4, 0.24, obtained at the CU ends. As Lucien said it's high, should be around 0.15ohms, although the reading for r2, should be around 0.40oms without parallel paths.

Making the assumption we are measuring 6242y cable?

 

[David M]

Sounds like a problem with the test procedure or interconnections to me. I can't see how you could have an open circuit if the end to end of both L & N conductors have continuity...? Or am I missing something also?

 

[tony mc]

Gonna try again

Try taking the socket outlet off and connect your probes directly to the cables.
The new test leads on the new Meggers don't seem to work on the adaptor plug in units!

 

[hightower]

If I use the plug connector on my Metrel it will only test between the live pin and the earth pin. So for these tests I have to use an adapter that I can plug the leads in to manually.

 

[DPG]

As per Hightower - need an adapter plug with the Metrels. Daz