Polarity Test

[Plonker 3]

I have asked several times now without getting a actual answer, please answer this time rather than trying to avoid the question. How do you prove polarity if the methods mentioned in this thread are unacteptable.

If you are struggling with a exam question then by all means start a new thread where someone will help you.

 

[Jurasic Spark]

I have asked several times now without getting a actual answer, please answer this time rather than trying to avoid the question. How do you prove polarity if the methods mentioned in this thread are unacteptable.

If you are struggling with a exam question then by all means start a new thread where someone will help you.

You said that polarity could be proved by linking R1 and R2 at the DB and.........
"When you operate the switch your meter will either show a very high reading or a very low reading."
I asked you:
Would it make any difference to your readings if you swapped the leads over on your meter???
You didn't answer this so I'll tell you, of course it wouldn't make a difference to your reading if you swapped the leads of the meter over. And for exactly the same reason it wouldn't make a difference to your reading if the L and E were reversed at any point inbetween the DB and where you are carrying out the test.
So do you still think you have proved polarity?

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[Plonker 3]

Seeing as you are not answering my question I think I shall just leave posting on it anymore.

 

[Jurasic Spark]

Seeing as you are not answering my question I think I shall just leave posting on it anymore.

Ok no problem. If you have ago at my RFC test question the answer will hopefully become apparent.

 

[trev]

i thought interconnecting r1/rn on your ring was the only way to prove polarity on sockets before the circuit is energised ?

Cross connectL and N at the CU then go round the RFC testing between them at each outlet, you should get a reading at each point. Then cross connect R1 and R2 at the CU and repeat, the highest reading being the one recorded.
1337, get your hands on a copy of GN3 and have a good read of it. When you're done read it again and again etc. When you come to the testing module you'll be several jumps ahead.

 

[Guest55]

Geez , were making a meal of this topic lol.
polarity checks are done both dead and live.
in addition to visual conformation , an earth loop tester will show L-E reversal and wont allow test , in answer to the earlier query.

 

[Guest55]

trust trev to butt in just before me lol.

 

[lauriehurman]

1337
If you really want to get a headstart (you've probably given up by now) ...

Don't say Live when you mean Line.
This is important (and not just for your exams). Understand that Neutral is live and can kill you.

Laurie

 

[NrVolts]

i did RFC test question and it does make you think

socket 1 reversed polarity L-N
socket 2 -ok
socket 3 Earth &Neutral reversed
socket 4 spur off the ring.
Anyone else have a go at this ? Dilb?