IR Testing???

[mljc71]

Hi All- New to this - loving the challenges!

EICR'd my house and found one of my ring finals had an IR problem- just getting to grips with testing and trying to gain experience- college was good, however, felt like it was more of learning to pass exams!

My ring final has an issue- if i test with breaker open-(off) L(load side of breaker) to E (earth bar) = good reading, N(neutral bar) to E= good reading- but L to N a bad reading. so if a possible dead short between L-N why doesn't breaker trip?

However, if i do a IR L and N to E i get a good result!

Sorry for my inexperience but can anyone help me?

 

[sparks1973]

always set the meter to 250V DC first as well....then if there are any connected loads....you won`t fry em..lol...

 

[HandySparks]

If you test L to N on low ohms range, what reading do you get? You don't seem to understanding that "0.00Mohms" is not necessarily a "short"; it could be anything up to 10kohms.

 

[AIM]

Found one last week. Extension lighting spurred of through 5 Amp fuse from RFC. Spur behind double bed headboard upstairs.

ALWAYS do 250V test first to find loads not found on visual examination, customer memory/knowledge failure.

I've often found readings in the range of 0.04Mohms for mobile phone/door bell transformers etc... and 0.24-0.26Mohms for neon switches.

 

[PKBristol]

why L+N to E a good reading? hheellppp want to learn

many thanks all

You say L to E was good, and you say N to E was good, well L and N (connected together) to E is just doing the same test's, you're just doing both at the same time. When you connect L and N together they become one.

Paul.

 

[mljc71]

thanks all - found the load in loft- but also e happy with the result i had l+n to e - good to have a bit of reassurance - cheers
also lol on a funny note - or not- what can be done about a neighbours alarm going off-any veiws on the law if i rip out main fuse lmao ! providing no battery back up - ffs lol - spose just call enviromental is best option !!

 

[GLENNSPARK]

and anyway....the O/P has stated that he carried out an EICR...so as such he can test both live conductors ...to earth.....it aint an initial verefication...is it...