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Discussion Starter · #1 ·
I'm in the process of testing a large commercial installation which was built in 03/2009. I'm the first contractor to fill out a EICR on the building and going off the installation certificate I can determine that the incoming cable is a 240mm2 4core xlpe/swa. The installation contractors have recorded the main incoming earth as being 120mm2 however it is a TN-S system using the sheath as the earth and using my reference sheets it states that the sheath has the copper equivalence of 92.6mm2 (120mm being the minimum recommended) this is obviously to small and gets written in section F as a C2.

I'd be interested to know of anyone else has experienced anything like this.

I know there's a way of using the adiabatic equation to determine whether it's acceptable or not but I'm not that great with that just yet. I also find it strange that it wasn't picked up by the designer. Many Thanks
 
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