ABSTRACT
This is very important but, sadly, poorly understood. So let us remind ourselves of the component parts of the earth fault loop path (Figure 9.1). Starting at the point of fault:
1. The cpc. 2. The earthing conductor and main earthing terminal. 3. The return path via the earth for TT systems, and the metallic
return path in the case of TN-S or TN-C-S systems. In the latter case the metallic return is the PEN conductor.
