Well, I could say with TNC-s you are never sure the potential the CPC will be, relative to earth. ?
And if you distributed TN-S with modern cables, you'd be stuck if the separate earth conductor were to break too, it's just there'd be no indication of that until it was too late ? ... at least with TN-C-S you get over and under voltage conditions, that are detected ... a broken neutral in TN-S can be just as damaging.
There are pro's and con's with each earthing arrangement, but I'm convinced that mixing the means of earthing in small curtilage properties, and many other installations such as those dealing with explosive atmospheres, buildings with lightning protection systems, etc, is simply not a good idea.
Well, I could say with TNC-s you are never sure the potential the CPC will be, relative to earth. ?
And if you distributed TN-S with modern cables, you'd be stuck if the separate earth conductor were to break too, it's just there'd be no indication of that until it was too late ? ... at least with TN-C-S you get over and under voltage conditions, that are detected ... a broken neutral in TN-S can be just as damaging.
There are pro's and con's with each earthing arrangement, but I'm convinced that mixing the means of earthing in small curtilage properties, and many other installations such as those dealing with explosive atmospheres, buildings with lightning protection systems, etc, is simply not a good idea.
