Becuase the conductor has a smaller CSA, and therefore a higher resistance.
cpc continuity test
- Thread starter ezekiel
- Start date
Becuase the conductor has a smaller CSA, and therefore a higher resistance.
On a ring final the resistance of phase-phase should be almost identical to the neut - neut measurement as the conductors are the same csa and length (or should be).
The main reason for a discrepancy will be something like a loose connection on a neutral connection somewhere (back of socket, terminal box, etc).
You'll need to go round the ring one at a time and check the terminations - good practise! At least you have continuity - thats a big plus.
Once you have sorted that out you can have a practise at measuring the R1+R2 of the ring.
It is detailed in the OSG and in guidance note 3. ALso its here: http://www.tlc-direct.co.uk/Book/8.4.2.htm
You could also localise the difference in resistance by doing the R1+R2 test and checking at each socket. The reading should be about the same. If you find a socket with a higher reading than the rest then it could be:
1. The location of your high resistance
2. A spur (not on the ring at all!
3. Another high resistance problem (dirty switch, etc)
Let us know how you get on.
The main reason for a discrepancy will be something like a loose connection on a neutral connection somewhere (back of socket, terminal box, etc).
You'll need to go round the ring one at a time and check the terminations - good practise! At least you have continuity - thats a big plus.
Once you have sorted that out you can have a practise at measuring the R1+R2 of the ring.
It is detailed in the OSG and in guidance note 3. ALso its here: http://www.tlc-direct.co.uk/Book/8.4.2.htm
You could also localise the difference in resistance by doing the R1+R2 test and checking at each socket. The reading should be about the same. If you find a socket with a higher reading than the rest then it could be:
1. The location of your high resistance
2. A spur (not on the ring at all!
3. Another high resistance problem (dirty switch, etc)
Let us know how you get on.
Ezi, google SERLEC, got a nice meggar test reel from them, £43 + screw you tax and postage, nice thou
End to end tests; phase and neutral near as damit should be the same, CPC will be higher (smaller csa)
End to end tests; phase and neutral near as damit should be the same, CPC will be higher (smaller csa)
If you're getting >1999ohm then it is a dead short (but you know it is not)
I bet you're using a test plug with your meter, try turning the socket switches on (fooled me for a while!!!)
I bet you're using a test plug with your meter, try turning the socket switches on (fooled me for a while!!!)
¿Que?
Sorry BAs, to much Sheep, again.......!!!
Ignore that last bit Ezi
Ignore that last bit Ezi
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If you're using the plug lead make sure your plugged in to the correct holes on your meter for the conductors you're testing for continuity between.
It should be standard practice to measure continuity across the test leads beforehand to make sure the meter has retained it's zero.
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