P
paulk11
Evening. Did a Zs test today on a TT lighting circuit and got a reading of 335ohms. I haven't checked Ze yet but I'm presuming that's also in the same ball park. I'm aware of the upper limit Zs of 1667 and the advice contained within the good book that states Zs should be below 200, so I'm in the middle. I've advised homeowner that it should be reduced if possible and I see a couple of options; Add an earth rod or increase the main earth with a 16mm CSA cable (it's currently only 6mm). It's been pouring with rain all week so no point adding water. Any other suggestions? Thanks