Ir test

[ceejay]

When i test 1 of the rings in a domestic fit i have carried out the IR test on the L+CPC i get >299 Mohms which is expected so i then moved on to the L+N and got 288 M ohms when i connect the L to L and N to N but out of curiosity i reversed the leads on the test kit and i got < 1 M ohm which doesn't make sense.
R1 = 0.24 OHMS
R2 = 0.29 OHMS
Rn = 0.24 OHMS

Test instrument is ETHOS 7290

 

[Sparky Ninja]

Your post is confusing me slightly. Are you saying that you are carrying out IR tests on end to end conductors on the ring (r1, rn & r2)? Or are the leads identified as L & N?

The readings you have put are in Ohms, and they look as expected.

 

[pushrod]

or you are putting the two Ls in one croc and 2 Ns in the other and getting 288 and when you reverse the meter terminals you get <1Mohm ?

 

[ceejay]

Sorry if i am confusing anyone, i just thought if i include the continuity results it might help the diagnosis.
I put both phase conductors in my brown croc clip[ and both neutral in my Green corc clips then reversed the clips so greeen onto phase and brown onto neutal. Leads wee connected correctly into the test instrument

 

[pushrod]

Well i agree it doesn't make any sense, either your meter, or leads, are dodgy or you did something you didn't realise- are the only things i can think of. Did you repeat it and get the same thing?

Is the ring in 2.5/1.5 mm if so your r2 is surprisingly low.

 

[ceejay]

2.5mm as yes i did repeat but thanks for the ideas. I did check the other ring and repeated the same i.e swapped the leads and the results were fine so the tester is good.