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

[Kev2632]

your colloquial expression.

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

Ahh ok , didnt do the R1+R2 test as there was no CPC running in the conduit the Ringmain CPC is the conduit so had too do the R2 test instead

 

[Knobhead]

I’ll tAk a tote on dat az weL. A weL mAd conduit SYS wiL alwys beat cabled systems w separate CPC.

 

[VoltzElectrical]

are you just testing this circuit or trying to fault find?

 

[VoltzElectrical]

so how are the sockets earthed then? surely you can link Live and earth at the db and test at the socket?? How are you gonna do a Zs then big boy?

 

[Kev2632]

On this circuit there is no faults just testing

 

[Kev2632]

Yea there is a earth cable coming from the box to the socket and i will be able to do my Zs then as the socket are earthed

 

[VoltzElectrical]

I would have just done R1+R2 and saved myself all that hassle!

 

[Kev2632]

So it's still eligible to do the r1+r2 test on the ring main where the conduit is the CPC yea? Just link at board and test at each socket yea?

 

[VoltzElectrical]

yeah man!

 

[Kev2632]

Thanks

 

[VoltzElectrical]

don't forget the thanks button dude.

 

[Kev2632]

Will do lad, I'm on my iPhone just now can't do it just now will later for ya

 

[Engineer54]

A wander lead is the correct method of testing conduit containment systems, though far better using a high current ductor tester!! All conduit system fed accessories should have a flying lead from box to face plate. Don't know why anyone would think you can't carry out ELI tests on conduit systems without a separate CPC?? You just don't, or shouldn't need them!!

 

[VoltzElectrical]

ive never come across or wired a conduit system using it as the earth. Always been in the spec that separate cpc needed. What is a high current ductor thingy then 54?

 

[Knobhead]

A Micro-ohm meter that injects a high current during the test.

Berthold Electric Power Services - Resistance Tests

 

[telectrix]

http://www.electriciansforums.net/commercial-industrial-electrical/34821-ductor-testing-cables.html

 

[VoltzElectrical]

i guess this is more specialised equipment because I have never seen or heard of one?

 

[VoltzElectrical]

thanks tel, that's a very informative thread.

 

[telectrix]

it's a bit like earth bond testing when doing PAT. high current, but a more accurate resistance measurement. the high current will show up any corroded joints in the conduit.

 

[Knobhead]

If you want one, you'd better have deep pockets.