Low IR on new radial circuit

[buzzlightyear]

Just to clarify a few points raised; the low IR is between line and CPC with nothing connected in the CU. Some of the sockets are metal faceplate and some are plastic. I have tried screwing each in individually and I get the same result and it is as soon as the screw is screwed into the backbox so nothing to do with pressure on the cables. R1R2 is 0.34 Ohms. Using 500v for the testing. The wall is quite new so is probably still damp.
Cheers

keep us informed .

 

[J D Hogg]

The cpc should be connected to earth whilst testing.

Normally yes but I am trying to identify a circuit fault and therefore trying to eliminate external factors.

 

[Midwest]

Normally yes but I am trying to identify a circuit fault and therefore trying to eliminate external factors.

How did you get on?

 

[H]

We’re the stripped off, insulated L and N and CPC excessively long?