High R1&R2 readings

[Guest77]

My ze for the db was 0.09 tested with main earth disconnected. My zs for the circuits was varied between 0.20 to 0.35.

To determin the ZE at the board, you would need to test the main earth and disconnect all other Earthing and Bonding conductors to avoid parallel path readings.

 

[Guest77]

he said the Ze is 0.09 mate.

yes and your point is?

 

[Simonslimline]

yes and your point is?

I was just reading what you wrote in an earlier post


ZS-0.09
R1&R2 1.20
ZE= 0.35


Was not sure if you had mixed up Zs with Ze reading thats all.

 

[Guest77]

I was just reading what you wrote in an earlier post


ZS-0.09
R1&R2 1.20
ZE= 0.35


Was not sure if you had mixed up Zs with Ze reading thats all.

LOL, yes I did mix up the readings chuckle, still interested in how he obtained the reading, although 0.09 sound good if it is a TNC-S system in any case.

 

[Leesparkykent]

do you have access to the junction box where the ring is connected to the 6mm cable? have you done a r1,rn and r2 continuity test of the RFC?

 

[Guest77]

do you have access to the junction box where the ring is connected to the 6mm cable? have you done a r1,rn and r2 continuity test of the RFC?

Yes my next question after the OP confirming the ZE reading would have been about the Joint Box, good point there Bud.

 

[Simonslimline]

So as this is a lollipop circuit, out of interest i imagine the ring part of the circuit still needs the standard tests applied as you normally would carry out?

A 40amp ocpd is surely not suitable?

 

[Pete999]

If it's a ring to radial it isn't going to be straight forward end to end, how have you tested it?

Looks like the OP is describing a lolly pop circuit

 

[Guest77]

So as this is a lollipop circuit, out of interest i imagine the ring part of the circuit still needs the standard tests applied as you normally would carry out?

A 40amp ocpd is surely not suitable?

Well the OCPD needs to be able to protect the cable, it may or maynot be okay, a 20 or 32 would be the choice of many I am sure, what we need from the OP is the following 3 ansers to the 3 questions below

(1) how did you measure the ZE
(2) are you 100% sure the ZS was at the furthest point on the circuit
(3) Have you inspected the JB to see if all conductors are tight.

 

[Leesparkykent]

So as this is a lollipop circuit, out of interest i imagine the ring part of the circuit still needs the standard tests applied as you normally would carry out?

A 40amp ocpd is surely not suitable?

Yes I use two lines on a sheet/cert. 1 for the 6mm cable and the other for the RFC. It shouldn't be on a 40A.

 

[Hellmooth]

Yes I use two lines on a sheet/cert. 1 for the 6mm cable and the other for the RFC. It shouldn't be on a 40A.

Thats what I was getting at, surely it should be tested separately?

 

[Hellmooth]

Was possibly another circuit supplied by the 6mm and 40a mcb which was never changed when the ring was added......?

 

[Leesparkykent]

Thats what I was getting at, surely it should be tested separately?

yes imo...R1+R2 of the 6mm cable on one line. r1,rn,r2 and R1+R2 of the ring final on the next line. Zs obviously highest reading on the RFC.

and mark it up on the sheet/cert as a hybrid circuit.

 

[matthodge]

So as this is a lollipop circuit, out of interest i imagine the ring part of the circuit still needs the standard tests applied as you normally would carry out?

A 40amp ocpd is surely not suitable?

I've got a few years experience under my belt, but, I've never heard of a lollipop circuit before. Are these common to you?

 

[TJ Anderson]

1. Probably did not null his leads to have an R1 + R2 that high bearing in mind Zs, or more likely, just can't test and god knows what he is referring to.
2. More interesting is the 40A RCBO on his 2.5mm RFC