continuity of a ring

[redface]

hello just wanted to know what difference you guys get on a ring when you connect phase of 1 side to earth of other and vice versa i tested 1 today and got about 3ohm difference i put this down to all the sockets building resistance on each joint.
what would u have i would say i would be happy with 0.5 difference.
but only 7 sockets and i took sockets off and tested from back do you get this ?

it is a ring? or not ?

 

[somersetsparks]

Sorry mate struggling to understand, are you doing an r1+r2 test if so correct procedure is put phase of 1 cable with earth of other cable in connector and vice versa with other cable. So you have both earths and lives crossed over and in connectors.
Then test at every socket between phase and earth, you should get the same reading from every point except spurs which will be higher.

Is this what you mean?

 

[pushrod]

I would like to help but i don't understand your post.

 

[tony mc]

Likewise give us you r1 r2 rn readings

 

[redface]

i know what i mean lol
yes phase of 1 cable with earth of other cable in connector and vice versa with other cable. i was getting from 12.5 up to 17 ohms the further away from connections and there was 7 sockets over 4 meter.
it is old installation and is this what i would expect? i would only expect the same readings if you R making a ring

 

[telectrix]

something wrong. readings way too high. you should be getting readings under 1 ohm

 

[i=p/u]

need r1 r2 readings thn you should be getting a quarter at sockets within0.5

 

[redface]

i know but that is not happening

 

[telectrix]

you need to measure the r1 , r2, rn, i.e. end to end of each conductor first. think you'll find one of them is high. if it's 2.5/1.5mm then the cpc resistance should be 1.67 x the phase resistance. once you've found which reading is excessive, look for the fault .

 

[tony mc]

Sounds like its not a ring final cct

 

[redface]

no i get good reading for phase conductors and earth phase and neutral the same and earth is a bit more and all sockets have been checked so would there be a bad jb somwhere

 

[telectrix]

must be a ring final if he's cross connecting and getting readings.

 

[telectrix]

could you be measuring at a spur? take readings all round the circuit.

 

[tony mc]

Hi redface

Post your readings and tests carried out so that we can try and give you some help just the readings you have posted are way on the high side especially if you r1 r2 rn good . Thats what Im reading into it anyway.

 

[i=p/u]

could it be a really long circuit with short