R2 test on a ring main where the conduit is the earth

[Kev2632]

What readings would expect for the wandering lead method whilst testing from the consumer unit to the sockets, would you expect in the region of less than 0.10 ohm?

 

[trev]

Comment removed owing to my inability to read and interpret headings

 

[Kev2632]

yea its a ring final but the conduit is the CPC and once ive deducted the resistance of the "wandering lead" im getting less than 0.10 ohm for the resistance of the conduit, does that sound right?

 

[VoltzElectrical]

What cable is used? Is it a RFC or a radial? whereabouts are you expecting to get this <0.1 ohm reading and why mate?

see his thread from yesterday for the whole story and this will all become clear.

He needs to find a fault in a circuit with high loop impedance where conduit is the earth.

 

[VoltzElectrical]

yea its a ring final but the conduit is the CPC and once ive deducted the resistance of the "wandering lead" im getting less than 0.10 ohm for the resistance of the conduit, does that sound right?

so from yesterday, we can deduce that the fault is on the live or R1 part of the circuit giving you greater than 200 ohms overall.

 

[Kev2632]

yea when i moved onto the Ringmain im getting less than 0.10ohm for the R2 reading on the ringmain circuit does that seem to be right ?yea

 

[Kev2632]

so from yesterday, we can deduce that the fault is on the live or R1 part of the circuit giving you greater than 200 ohms overall.

different circuit now

 

[VoltzElectrical]

you didn't mention yesterday it was a ring final. Have you taken all the socket fronts off?

 

[VoltzElectrical]

different circuit now

did you u fix the other one?

 

[Kev2632]

you didn't mention yesterday it was a ring final. Have you taken all the socket fronts off?

im on a different circuit than yesterday and all im wanting to do is get my R2 reading for the ringmain and im getting less than 0.10ohm for the ringmain does that sound right? its a 1 storey 1 bedroom house really small.

 

[Kev2632]

did you u fix the other one?

put it down on my test report to investigate further soon

 

[VoltzElectrical]

i'l chance it and say yeah, sounds about right. You're spending some time testing this house!

 

[Kev2632]

i'l chance it and say yeah, sounds about right. You're spending some time testing this house!

yea thats what i was thinking ye, you always expect really low readings like that yea, with a small house and when testing for the R2 reading yea??? nahh ive been busy with other jobs and that this last two days, only got a wee while here and there at it like.

 

[telectrix]

yea, well let me take a pull of this here spliff while i think, nahh, bad weed, poor joint somewhere.

 

[Kev2632]

yea, well let me take a pull of this here spliff while i think, nahh, bad weed, poor joint somewhere.

so what your telling me thats too low a reading is it??

 

[VoltzElectrical]

innit do bruv

 

[VoltzElectrical]

so what your telling me thats too low a reading is it??

come on kev, low readings are what you want on R1, R2 testing. Think back to your time in college, ohms law and all that.

 

[Kev2632]

come on kev, low readings are what you want on R1, R2 testing. Think back to your time in college, ohms law and all that.

Yea i know that yea just wasnt sure about R2 testing thats all whether to expect such a low reading for it, but what is Telextrix talking about,

 

[Edd]

Low readings on a conduit system R2 reading is what you want and the reading you got was fine. remember its a big lump of metal and a high reading would indicate bad joints!! and a bad joint really aint what you want.. Telextrix pass round what ever that is

 

[VoltzElectrical]

your colloquial expression.

What fault are you trying to find on the ring circuit? What R1+R2 did you get for the circuit?