Insulation Resistence on ring main

[Dannydigger]

Hi Guys,

I am absolutely baffled at the moment as to why i cannot get the correct reading for insulation resistence when Im testing the line/neutral on the ring main. I have made sure everything is unplugged, disconnected the neutral from the bar and allgator clipped to my test lead. When I press test, it goes through the relevent steps and comes back with 0.00

I have also tried this on my ring main at home and still get the same reading for line/neutral.

I get >1000 when I do CPC/Neutral and all other Circuits give correct readings of >1000

Its just the Line/Neutral that is stumping me, any help is greatly appreciated

 

[Simonslimline]

I imagine there is still a load connected somewhere.

 

[Darkwood]

You still have something connected... Your seeing a load.

Check for fused spurs..
Hidden sockets in cupboards on top of kitchen units etc
Gas ignition power is often forgotten about on gas hobs or ovens
Some boilers/timeclocks are of rings in older installs
Discuss with customer about any hidden sockets he may know of and also consider external power that may be tagged of the ring.

Always do your first test on a ring using the 230/240v setting to see if there is a load connected, this way you won't damage electronic equipment with 500v

 

[yellowvanman]

I'm guessing this is not a brand new circuit so your not obliged to test line/neutral anyway.

Set tester onto continuity and see what reading you have then, it'll probably be a load that you are not aware of.

 

[Simonslimline]

TV ariel booster perhaps.

 

[newtothis]

Have you got 2 neutral bars, are you one the right one ?

sorry disregard this

 

[Darkwood]

Have you got 2 neutral bars, are you one the right one ?

Not sure you have read or understood the opening post correctly - his insulation test are showing a short circuit between L/N the other tests were clear.:thinking:

 

[newtothis]

Not sure you have read or understood the opening post correctly - his insulation test are showing a short circuit between L/N the other tests were clear.:thinking:

I'm sure I misunderstood :stuart:

 

[PEG]

Not sure you have read or understood the opening post correctly - his insulation test are showing a short circuit between L/N the other tests were clear.:thinking:

Ooooh...a nice 1/4" plate made from copper,bolted across line and neutral...should be easy to find...:tounge_smile: (could not resist!)

 

[Dannydigger]

I carried out continuity tests and all came back fine at 0.15

i did minor works and on my certs it asks for I/R on l/n n/e l/e

im assuming my customer hadn't pulled out all plugs as requested as continuity was fine and I also did the crossover test with line and neutral and tested at socket that was replaced.

Thanks again for for the help guys, it's really appreciated

 

[Guest77]

Hi Guys,

I am absolutely baffled at the moment as to why i cannot get the correct reading for insulation resistence when Im testing the line/neutral on the ring main. I have made sure everything is unplugged, disconnected the neutral from the bar and allgator clipped to my test lead. When I press test, it goes through the relevent steps and comes back with 0.00

I have also tried this on my ring main at home and still get the same reading for line/neutral.

I get >1000 when I do CPC/Neutral and all other Circuits give correct readings of >1000

Its just the Line/Neutral that is stumping me, any help is greatly appreciated

? you are Jesting Danny surely.

 

[Dannydigger]

I'm not.

 

[Guest77]

well if your getting that reading then obviously you have something else connected as mentioned by at least two of the guys here, the worrying thing is you don't know that, especially as you tried it at home as well which proves it really, just because all plug tops are removed from sockets doesn't mean all loads are disconnected from the ring final circuit.

 

[Dannydigger]

And why would I be jesting??? Isn't this what this forum is for to help people and not to try and make people look small by making crappy comments??





Edited that for you Danny please avoid expletives, thankyou

 

[Guest77]

Sorry I thought you were actually jesting, now I know you are not I apologise for thinking you were, perhaps a refresher course in testing and inspecting may help fella.

https://www.ableskills.co.uk/electrical-courses/city-guilds-2395-inspection-testing-course/