Iec 60364pdf Fixed -

The source neutral is directly connected to earth, and the exposed conductive parts of the installation are connected to that same point via protective earth (PE) conductors. This is sub-divided into TN-C (combined neutral and earth), TN-S (separate neutral and earth), and TN-C-S .

Compulsory initial verification with mandatory scheduled periodic testing to check for deterioration. iec 60364pdf

: Establishes the core objective—protecting people and property from electrical hazards. It defines the scope, energy configurations, and general characteristics of installations. The source neutral is directly connected to earth,

IEC 60364: Electrical Installations of Buildings - Wiring Regulations TN-S (separate neutral and earth)