Eicr

[Platinum lad]

Hi all need some advice when filling out test results on eicr's after carrying out live zs tests do you leave out R1 R2 column as in a lot of cases the measured reading is below ze value do you just make a note that it is a measurement and not a calculation?
any help appreciated

 

[Guest55]

you must complete either the R1+R2 column or the R2 column.
you cant omit both.

 

[Platinum lad]

But how can you work out r1r2 from zs when it's not a true reading regarding service earths? If measured was below the ze what would you suggest? Thanx for response btw

 

[sedgy34]

If you can't isolate to test r1r2 you will have to put down as a limitation on testing

 

[SPARTYKUS]

But how can you work out r1r2 from zs when it's not a true reading regarding service earths? If measured was below the ze what would you suggest? Thanx for response btw

You can't work it out from the Zs!

it's a dead test!!

 

[GLENNSPARK]

whats the issue here...?
if you cant do cross connetions at the board (over congested)...then cross connect at a socket outlet....
or as has been said....limitation...

 

[Deleted member 72666]

You have to enter the results regardless of them tallying or not. You will get different results on occasions (parallel earth paths) but they are what they are.

 

[sedgy34]

Is this a radial or ring circuit your trying to calculate here as calculating a ring circuit is forbidden!

 

[Platinum lad]

Hey guys I hear what your saying but I know guys who carry out live zs tests and work out r1r2 from measured ze now I was always told zs - ze does not equate to r1r2

 

[SPARTYKUS]

Well they're as deluded as the man at Megger that decided you can work it out as well and put this interesting feature on a meter (17 series, released fully tested)

 

[Jay Sparks]

The equation your looking for is Zs = Ze + (R1 + R2). You can not transpose this to work out (R1 + R2). i.e, you cant deduct the measured Ze from the measured Zs to get an (R1 + R2) measurement!!

 

[Platinum lad]

There sure are a lot of dudes with bad habits out there! Thanks guys

 

[GLENNSPARK]

well well well....
never ceases to amaze does it..
so some out there who are evidently teaching..in some form or another are putin it about that R1 R2 can be acheved by deducting a Ze from Zs....lol...
and i`v heard this before...

 

[Kate]

well well well....
never ceases to amaze does it..
so some out there who are evidently teaching..in some form or another are putin it about that R1 R2 can be acheved by deducting a Ze from Zs....lol...
and i`v heard this before...

I was taught to do this!! Except on TT!
Just to be clear I do not do this now!

 

[ipf]

I was taught to do this!! Except on TT!
Just to be clear I do not do this now!

That's interesting, Kate.
Who taught you to do it ?........and who taught you not to ?

 

[SPARTYKUS]

I was taught to do this!! Except on TT!
Just to be clear I do not do this now!

In my best bollywood voice

"oh my goodness!"

 

[varilite]

whats the issue here...?
if you cant do cross connetions at the board (over congested)...then cross connect at a socket outlet....
or as has been said....limitation...

only need to do end to end for EICR dont need to do cross link connections as the installation has power and polarity can be checked when doing ZS.

 

[SPARTYKUS]

And in fact, maybe even less than that; ultimately what is to be done is defined upfront, if it is just to do IR tests on one circuit and a Ze, then that is what will be done!! The rest isn't part of the agreement.

 

[GLENNSPARK]

only need to do end to end for EICR dont need to do cross link connections as the installation has power and polarity can be checked when doing ZS.

yep but my tester wont do low current loop....
so i get R1 R2....its either or...

 

[Kate]

I was testing as a 2nd year apprentice, so it had barely been covered at college. My 'mentor' taught me to do it like that. But...what do u expect, company of at least 20 qualified electricians and maybe 2 had 2391, but hey as long as boss sat behind a desk co-signed it!!
Umm, it must have been college that taught me right, never would have passed exams otherwise. And since things have been in my own name I don't like to cut corners.