does anyone could help,high Zs value

[telectrix]

Or---- get a joiner to band a nail through a cable. that should bring it down

 

[Johno]

I only suggested it to see if it was a fault on one of the settings on your testers

 

[Johno]

if you were testing Ze on high and Zs on no trip, then I just thought that it was possible that this was the reason for the difference. Testing Ze on no trip would rule this out.

 

[wiktor1072]

if you were testing Ze on high and Zs on no trip, then I just thought that it was possible that this was the reason for the difference. Testing Ze on no trip would rule this out.

well,I can not test Zs on high because rcd would trip obviously,but Ze why i should test on non trip if there is no Rcd protection?tnx

 

[wiktor1072]

I only suggested it to see if it was a fault on one of the settings on your testers

oh I see!no mate I thought the same ,that is only the one installation I can not understand .the procedures I'am keeping the same.

 

[Johno]

Can you read? If so, read my posts again. What I am trying to say is that you need a common denominator to rule out a fault in the testers (not that this would totally rule this out), but if I were you I would try it.

 

[wiktor1072]

Can you read? If so, read my posts again. What I am trying to say is that you need a common denominator to rule out a fault in the testers (not that this would totally rule this out), but if I were you I would try it.

Right!

 

[Benny_Boy]

Just read this thread and having had a think about the current path am wondering if the main switch might have a high resistance contact in it. Could explain the uniformly high direct Zs readings you're getting. If you've got a spare, try swapping the main isolator and retest. Also if you have an isolator fitted after the meter but before the CU this is also a possible fault location.

Just have a think about where those electrons are flowing and elliminate every switch and union one by one. You'll get it!

 

[wiktor1072]

Just read this thread and having had a think about the current path am wondering if the main switch might have a high resistance contact in it. Could explain the uniformly high direct Zs readings you're getting. If you've got a spare, try swapping the main isolator and retest. Also if you have an isolator fitted after the meter but before the CU this is also a possible fault location.

Just have a think about where those electrons are flowing and elliminate every switch and union one by one. You'll get it!

HI Benny!!!that is the point!!!Thanks a lot,Today I have done the test
again as You and other guy suggest to get do Zs at Cu and there is a problem I got the new make of Cu I have not use before,but when I measured at the bass bar one Rcd showing 0,53 other 0,64 ohm at Ze=0,04.
Yes I am going to do the test once more at Main Isolator and see,unless now I know what is the problem.Thanx a lot mate,very helpfull!great job!

 

[wiktor1072]

I'd carry out a zs test at the main switch at the DB, then on the MCB's to see if the RCD's or MCB's are giving any additional impedance.






huh?

sorry mate just notice I have post a wrong message to You!
But thank You very much for an advise,I did the test as You sed and You are right the problem is with the rsd,s or with the main isolator,i will have to do just another test at the isolator on its own.But I got the answer,where is the problem,thank's a lot mate!!

 

[Benny_Boy]

sorry mate just notice I have post a wrong message to You!
But thank You very much for an advise,I did the test as You sed and You are right the problem is with the rsd,s or with the main isolator,i will have to do just another test at the isolator on its own.But I got the answer,where is the problem,thank's a lot mate!!

Glad to help.