Traineeboy
Well-known member
- Joined
- Apr 22, 2020
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I understand the difference between the 3 main earthing system but I saw an earthing system in a house that looked like a combi of a TN-S and a TN-C-S system. I.e there was a main earthing conductor coming out the sheath of the cable but also a main earthing conductor coming of the service head. Anyone know that this could be ?