Results on a continuity test on a final ring circuit

[wayneward25]

Hi Guys.

Ive done some tests on an existing final ring circuit today and the result at the board was R1 +Rn = 0.19

At the sockets it varied between 0.19 to 0.22

Is this right or should they all be the same?

the end to end of the R1 was 0.40
the end to end of the Rn was 0.39
the end to end of the R2 was 0.91

the R2 seemed high to me considering the 1.67 rule for 1.5mm all the sockets were tested and there were no lose connections.

The R1 +R2 was 0.29 at the board and at the sockets varied between 0.32 to 0.37

The Ze was 0.18 on a pme

 

[EFLImpudence]

Ive done some tests on an existing final ring circuit today and the result at the board was R1 +Rn = 0.19
At the sockets it varied between 0.19 to 0.22
Is this right or should they all be the same?

That's fine.

the end to end of the R1 was 0.40
the end to end of the Rn was 0.39
the end to end of the R2 was 0.91
the R2 seemed high to me considering the 1.67 rule for 1.5mm all the sockets were tested and there were no lose connections.

There could be a loose connection - or
old cable was 2.5/1.0

The R1 +R2 was 0.29 at the board and at the sockets varied between 0.32 to 0.37

How were you measuring at the sockets?
A plug in connector will suffer by worn socket contacts or could be worn switches.

The Ze was 0.18 on a pme

Ok, Why do you mention it?

 

[JohnW2]

the end to end of the R1 was 0.40
the end to end of the Rn was 0.39
the end to end of the R2 was 0.91
the R2 seemed high to me considering the 1.67 rule for 1.5mm all the sockets were tested and there were no lose connections.

As EFLI has said, if it were old 2.5/1.0mm² cable, that R2 value would be about right (in fact, a little low, one would have expected about 1.0&#937. Is it 'old colours' cable?

Kind Regards, John

 

[wayneward25]

Hi yea it is old colour cables. ive changed all the sockets so they are all new.

I did think it could be 1mm cpc after i need to go back and recheck

i mentioned ze just for info

 

[EFLImpudence]

I did think it could be 1mm cpc after i need to go back and recheck

There may be some of each.

 

[wayneward25]

Yea good point there is a mix of old and new colours

 

[wayneward25]

I think thats solved my issue with the higher reading on the cpc thanks guys