High Zs on ring final circuit | Page 2 | on ElectriciansForums

High Zs on ring final circuit

Discuss High Zs on ring final circuit in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

robo83 said:
Thanks Murdoch,

I mention before I have mainly done commercial so old school houses are become the norm.

One thing for sure, if I'm not sure the yellow book appears. I also post here to seek everyone's opinions.

Many thanks

Sent from my SM-N910F using Tapatalk
Click to expand...


Not sure I understand this reply, is that due to tapatalk?
 
robo83 said:
Thanks Murdoch,

I mention before I have mainly done commercial so old school houses are become the norm.

One thing for sure, if I'm not sure the yellow book appears. I also post here to seek everyone's opinions.

Many thanks

Sent from my SM-N910F using Tapatalk
Click to expand...

Did you not test properly doing commercial? Testing is testing irrespective of the type of installation
 
robo83 said:
Hi,

R1 = 0.29
Rn = 0.30
R2= 1.30

Measured zs 1.48

The socket in question was a spur, the rest of the ring was highest reading 0.42 r1+r2

OCPD 32amp was on the circuit.

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Click to expand...

So the socket in question is a spur of the ring main and not part of the actual ring main?
 
Murdoch said:
Did you not test properly doing commercial? Testing is testing irrespective of the type of installation
Click to expand...
Did mainly metal munching on rail projects. Domestic is another ball game and I'm sure you would respect that although testing is testing it's a bit different when u had Bob the builder playing games compared to a fresh install.

Sent from my SM-N910F using Tapatalk
 
first thing i'd do is investigate the high r2 value. that's end/end of the \RFC and nothing to do with the spur. then i'd do a hi-current Zs bypassing the RCD and MCB to eliminate any internal resistance errors.
 
Thanks Telectrix

If the r1+r2 was fine throught the circuit except the spur. But still getting a high r2 value end to end.

Surly that would mean there is a loose connection on the ring where the spur has been taken?



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Last edited:
Tel, could you explain the process of bypassing the RCD and MCB for the high current test. Would you just link the circuit line to the load side of the main switch temporarily? Anything to keep in mind for this - obviously I would say it's safest to do load free.
 
r2 is nothing to do with the spur. it could be a poor connection anywhere on the ring. and please differentiate betweem r and R. it's confusing if you mix them up.
 
hightower said:
Tel, could you explain the process of bypassing the RCD and MCB for the high current test. Would you just link the circuit line to the load side of the main switch temporarily? Anything to keep in mind for this - obviously I would say it's safest to do load free.
Click to expand...

Bypassing the RCD/MCB


ISOLATE the circuit in question and double check that it is isolated!!


Link the CPC and Line at one of the socket outlets on the circuit in question


At the CU with your tester set to High ZS Loop place one probe on the outgoing side of the isolated circuit being tested and the other on the Line supply on the main switch.


Note reading on tester and REMOVE LINK BEFORE MAKING CIRCUIT LIVE AGAIN!!

Hope this makes sense!
 
hightower said:
Tel, could you explain the process of bypassing the RCD and MCB for the high current test. Would you just link the circuit line to the load side of the main switch temporarily? Anything to keep in mind for this - obviously I would say it's safest to do load free.
Click to expand...
just been posted .. #29. by tony mc. and richard burns has posted an excellent diagram of the procedure .


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