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 Post subject: Live neutral reversed
PostPosted: Mon Oct 02, 2017 3:22 pm 
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Hi, I have added 3x double sockets to the ring main downstairs. The first socket is fine, when tested with a socket tester. The other 2 are showing a live neutral reverse, but work. When i use my meter to check polarity all is fine. All connections are correct, continuity is correct, so i'm a little stumped. When i get home later, i'm going to plug a lamp into the socket with out a lamp to see if get a permanent live when the socket is switched off. Any other tests i can do? if the cables are faulty, then it is more than one. Could i be that unlucky?


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PostPosted: Mon Oct 02, 2017 6:05 pm 
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Not sure how socket testers reference, I have seen where a disconnected earth can give odd readings on test equipment showing line - neutral reversal rather than no earth. Sockets will work with no earth and with line - neutral reversible, however with the UK system it is not safe, in some countries they use double pole MCB's but not in UK.

Using a loop impedance tester we actually draw current so any poor earth will be highlighted, without the loop test which some plug in tester do, you can get all sorts of bad readings.



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PostPosted: Mon Oct 02, 2017 6:19 pm 
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Can you describe exactly how you have extended the ring ?

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PostPosted: Tue Oct 03, 2017 9:30 am 
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wine~o wrote:
Can you describe exactly how you have extended the ring ?


Hi, i removed a socket on the existing ring, took 1x cable to the first new socket (which shows no faults) then looped out/in to the 2nd & 3rd, then connected back in to the other cable from the original removed socket

The test with the lamp was fine. There was no permanent live when the socket was switched off


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PostPosted: Tue Oct 03, 2017 3:51 pm 
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Are you sure you have connected to the correct connections int he back of the sockets? Some can look similar, but are different.
Do the other sockets already on the ring test OK?
If they do then it's probably either something you have done or a fault with the cable or sockets.
I say "probably" because without more thorough testing with the right kit, (as Eric says above) and knowledge of how your particular socket tester works, then it can be difficult to find a fault like this via a forum.


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PostPosted: Tue Oct 03, 2017 3:54 pm 
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yes, all connections are fine. I'm steering towards faulty cable,too.


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PostPosted: Tue Oct 03, 2017 3:58 pm 
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inaminute23 wrote:
yes, all connections are fine. I'm steering towards faulty cable,too.

Long shot though I'm afraid.
Possibly mechanically damaged when pulling in somehow.


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PostPosted: Tue Oct 03, 2017 5:54 pm 
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"faulty" is often used when it should not be used.

How do you suppose the cable is "faulty" if there was a fault it would have gone bang. If L & N really are reversed it has been connected wrong.

Why not post pictures of the back of all sockets concerned and the "tester" used.

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No such thing as "Thou shalt put this wire here, Thou shalt put that wire there" .............Take a picture BEFORE you do the job.

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PostPosted: Tue Oct 03, 2017 6:59 pm 
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someone-else wrote:
"faulty" is often used when it should not be used.

How do you suppose the cable is "faulty" if there was a fault it would have gone bang. If L & N really are reversed it has been connected wrong.

Why not post pictures of the back of all sockets concerned and the "tester" used.


Could be a neutral /Earth fault, down to a sharp edge or something when pulling in.
Disconnect cable and test, although you need a Megger really.
Depends how the socket tester works.

ETA Disregard that. You need to check the wiring again.


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PostPosted: Tue Oct 03, 2017 8:09 pm 
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inaminute23 wrote:
wine~o wrote:
Can you describe exactly how you have extended the ring ?


Hi, i removed a socket on the existing ring, took 1x cable to the first new socket (which shows no faults) then looped out/in to the 2nd & 3rd, then connected back in to the other cable from the original removed socket

The test with the lamp was fine. There was no permanent live when the socket was switched off



Double pole or single pole switched sockets?


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PostPosted: Wed Oct 04, 2017 9:51 am 
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hi, the only other connections i haven't checked again are the junctions under the floor where the old socket was, all others are correct, i don't need to send pics.

My sockets are single pole btw.

I forgot to mention i have had readings from N to E of 40v, but I have had my meter on these connections 20 plus times, and the vast majority of times it reads 0v.

Pic attached to show the sockets are wired

Attachment:
IMG_20171004_093453__1507106789_151.237.235.14.jpg
IMG_20171004_093453__1507106789_151.237.235.14.jpg [ 48.66 KiB | Viewed 350 times ]


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