Thank you for the advice..Ze o
You don't appear to be clear with the problems here.
You talk about insulation resistance of 2.36 to 4.27 - is this Mohm?
This is irrelevant to the Zs
You don't appear to know the differences between insulation resistance, Ze and Zs.
If you do have Ze of 0.16 ohm at the feed end of the cable and ~2.5 ohm at the load end, there is absolutely something wrong with the cable or terminations.
I would expect a r1 + r2 of 0.5 ohms or thereabouts.
You need to find this fault, not cover it up by adding rods or anything else.
You need to measure the r1 + r2, the r1 + rn etc. This will show if you have a cable fault. And will identify which conductor is the problem, if they all read 0.5 ohms (less for r1 + rn) then the fault is between the cable feed end and the header. - most likely a bad connection in the earth path.
yes - Clearly stated
Insulation resistance
N-L 2.36 Mohm
N-E 4.27 Mohm
L-E 3.37 Mohm
Ze at origin 0.16
Load end of swa 2.42
Connections at feed end sound
Will double check load end next visit as earth clamp used on armour and not accessible yet (cupboard base being removed to access)
Will do continuity tests same time.