We visited Vevy in the French part of Switzerland last weekend and while walking from the hotel to the railway station I came across these works for the replacement of an LV distribution cabinet. It doesn't look very Swiss but I guess it is a mixture of new and old. There seems to be several different, separate, earthing tapes. Is this usual?
near surface earth electrode can often be quite effective. I have measured a genset on its skids and got a lower resistance than the rod that was supposed to earth it, and in a hurry, parking the truck on a plate electrode in a puddle is a standard wheeze. The problem is that you are at the mercy of dry weather or ice removing the mobile water molecules, but in the UK at least you do not get freezing at great depths. You do have to think about water tables, and sandy soils can be a problem.
Those tapes could just be corrosion resistant connections to buried rebar etc.
Having two or more ends allows a ring-round test of the connection to the earth electrode at high current rather than just hoping or only testing Zs.
near surface earth electrode can often be quite effective. I have measured a genset on its skids and got a lower resistance than the rod that was supposed to earth it, and in a hurry, parking the truck on a plate electrode in a puddle is a standard wheeze. The problem is that you are at the mercy of dry weather or ice removing the mobile water molecules, but in the UK at least you do not get freezing at great depths. You do have to think about water tables, and sandy soils can be a problem.
Those tapes could just be corrosion resistant connections to buried rebar etc.
Having two or more ends allows a ring-round test of the connection to the earth electrode at high current rather than just hoping or only testing Zs.
