RFC - end to end on CPC higher than expected ( EICR code advice please )

[freedomrun]

In the process of a domestic EICR. RFC, i'm getting L-L (0.11) N-N (0.11) cpc-cpc (0.48) had to take off all socket fronts anyway as i did not like what i saw on a couple of random selected s/o & i've tightend up any loose cpc terminals i can find. I'm guessing that there could be a JB with a loose terminal somewhere. What code would you recommend i put on the EICR? Thanks.

 

[Silly Sausage]

If your Zs is within limits, I'd say C3.

 

[freedomrun]

(TN-C-S) The RFC has RCD protection to 30mA, so Zs not an issue?

 

[J.C.E]

whats it wired in? t+e? even if it is, end to end on cpc is usually slightly higher than live and neutral due to being slightly less in csa.

 

[Risteard]

For T&E it should only be around 1.67 times greater - not 4 1/2 times greater!!!

Had trouble before trying to explain the problem to firms I've worked for. It requires improvement in my opinion as there is very clearly a loose connection on the most important conductor.

 

[freedomrun]

T&E copper (2.5mm L) (1.5mm cpc) CU says 1991 as date of manufacture, i'd say cable is same age. got he same test results at two different locations on the RFC.

 

[telectrix]

Time for the wander lead to come out of it's hidey hole. Find where the resistance increases.

 

[Engineer54]

(TN-C-S) The RFC has RCD protection to 30mA, so Zs not an issue?

It is an issue!! ....RCD protection is classified as ''Additional'' protection on TN systems, not a circuits Prime protection!! In other words they should not be seen as a replacement to the normal/standard automatic disconnection system!! It's a bit different on a TT system!! lol!!

 

[freedomrun]

Ok, maybe i should have said it was'nt an issue as RCD protection present, but just trying to say that on a TT system, the OSG quote a recommended maximum of 200 ohms for a cct. The cct in question is 30mA RCD protected on a TNCS - So the 'real' maximum Zs could be up to 200 ohms & not the figures in the OSG. I still have to record my figures of Zs anyway. I understand RCD protection is not Prime protection.

 

[SimpleSimon]

What is your Zs? Could be old earthing terminals on the back of sockets causing resistance?

Sent from my GT-I9100 using Tapatalk

 

[freedomrun]

Zs recorded live on this cct is (0.54 ohms) and Ze is (0.21 ohms) many of the sockets have cpc's twisted together and single sleeved also.

 

[ackbarthestar]

Even with a 1.0mm2 cpc the lengths don't stack up so I would think it is, as already stated, a loose connection but more likely to be a corroded high resistance joint.
Do you zero your instrument every time you continuity test?

 

[Octopus]

Back to the OP, IMHO its a code 2 and no fiddling with sockets or wander leads until the client agrees to pay!

 

[freedomrun]

Test leads all in good order and always Zero before tesing.