Annoying simple circuit

[Ldm]

hi ladies and gents

I have opened a ring final circuit to add 3 sockets. All was goin well till I powered it up and it keeps tripping. I have tested and IR comes back fine. continuity also fine, all test readings are fine. the circuit has 9 sockets and has a 32 type c rcbo. any other info needed please ask.

sorry for the short message but my keyboard is dying.

thank you

 

[trev]

confused? doing R1+R2 end to end tests at ccu wont show up if there in the wrong terminal in field with nothing plugged in

if i was doing r1+r2 in the field then of course it would show up but what most people use a quick R1+R2 for is to check continuity of the ring.

Shanky the result you're on about is a result you get from the polarity test on an RCF. Now think about how that's done mate.
You're missing out a very important step.

 

[Sparkie30]

my point is if you at socket wired neutrals on earth and earths on neutral. when doing tests on the board not socket. your tester will not tell you that you wired a socket wrong. from my understanding thats what shanky said.

when doing continuity, you checking the resistance of conductors and making sure connected inline

 

[dazza1981]

confused? doing R1+R2 end to end tests at ccu wont show up if there in the wrong terminal in field with nothing plugged in

if i was doing r1+r2 in the field then of course it would show up but what most people use a quick R1+R2 for is to check continuity of the ring.

Yes shanky confused..... have a think !!!

 

[shanky887614]

Yes shanky confused..... have a think !!!

what im saying is if the right cores are together there just in the wrong terminals in the back of say a 2gang socket

then the fault would only apear when something is plugged in

because there wouldnt be a dead short between the cores or anything and your readings would be as expected

 

[trev]

my point is if you at socket wired neutrals on earth and earths on neutral. when doing tests on the board not socket. your tester will not tell you that you wired a socket wrong. from my understanding thats what shanky said.

when doing continuity, you checking the resistance of conductors and making sure connected inline

How and why do you carry out a polarity test on a ring?
The tests you're describing are a very small part of the testing process and doing only these tests means that you have not tested the circuit properly.

 

[dazza1981]

what im saying is if the right cores are together there just in the wrong terminals in the back of say a 2gang socket

then the fault would only apear when something is plugged in

because there wouldnt be a dead short between the cores or anything and your readings would be as expected

But you still have to check at every socket outlet on the circuit...... not just connect them together at the board and test there !!!!!
Otherwise what's the point in doing this test shanky???

 

[7029 dave]

End to end, measure resistance Lto L NtoN EtoE, at origin fig8 LtoE measure resistance looking for half resistance, go round each socket on ring the same value should be obtained, repeat on NE. Proving continuity and polarity.

 

[trev]

End to end, measure resistance Lto L NtoN EtoE, at origin fig8 LtoE measure resistance looking for half resistance, go round each socket on ring the same value should be obtained, repeat on NE. Proving continuity and polarity.

Is the incorrect answer.

 

[Simonslimline]

end to end, measure resistance lto l nton etoe, at origin fig8 ltoe measure resistance looking for half resistance, go round each socket on ring the same value should be obtained, repeat on ne. Proving continuity and polarity.

L+ N?

This thread is getting silly now.

 

[shanky887614]

you guys dont read the full posts do you? i was saying most people do this test at the board and it only takes one missed socket to hide this issue.

just because it would be very rare to find it doesn't mean we should ignore that it can happen, without knowing what can and cant happen it makes the job a lot harder.

in an ideal world you would spot this kind of problem before you even get your test gear out

its called a test and inspection your supposed to do a visual first and its something to watch out for because things like this might come up as clear during tests but its not right

 

[dazza1981]

end to end, measure resistance lto l nton etoe, at origin fig8 ltoe measure resistance looking for half resistance, go round each socket on ring the same value should be obtained, repeat on ne. Proving continuity and polarity.

no
wrong

 

[Silly Sausage]

L+ N?

This thread is getting silly now.

Everyone take a step back now and think!!!

 

[Simonslimline]

you guys dont read the full posts do you? i was saying most people do this test at the board and it only takes one missed socket to hide this issue.

just because it would be very rare to find it doesn't mean we should ignore that it can happen, without knowing what can and cant happen it makes the job a lot harder.

in an ideal world you would spot this kind of problem before you even get your test gear out

its called a test and inspection your supposed to do a visual first and its something to watch out for because things like this might come up as clear during tests but its not right

I think the point is that it will show up if the tests are carried out properly and in the correct sequence.

 

[trev]

FFS hallelujah...... ssssssimples.

You sure? Read it again mate.

 

[Sparkie30]

Is the incorrect answer.

yeah agree with him totally but what we were saying was on the board not sockets.