I ripped out 4 core 25mm SWA the other week feeding a 3 phase sub board
probably about 60 metres, they were certainly using the armour as the cpc.....
Wayne, so what is the value of R2 for the armour of SWA? (and i'm not being 'funny' that is a genuine question)
I think this would have more to do with the adiabatic fourmula, because R1+R2 would only be relevant if you knew the breeaker (and its corresponding Zs) protecting the SWA
Now, just thinking logically here chaps, if you have TNS at your house, chances are its being feed from SWA, with the armour being used as the earth........
