TonyM58

I agree with Easyfox

i would just confirm R2 at the light switch, and do my Zs at the ceiling rose (calaculated from the (R1+R2) value

Dan, i use a Megger. If we are on 'no trip loop' we use three leads, and normal earth fault loop is two leads (which connect to line and cpc). Cant recall how the Fluke carries out the Zs or Ze test, but do you have a two or three lead option? it wont be called 'no trip loop' but somenthing similar