Power Systems

Mains Power Systems, European Standard, German Standard VDE 0100

L1 Lead Phase 1
L2 Lead Phase 2
L3 Lead Phase 3
N Neutral Lead
PE Protective Conductor
PEN Protective Conductor + Neutral Lead

TN-S System    - system with separate PE and N conductor throughout the system, today's preferred installation type

TN-C System    - combined PE and N conductor, only allowed for cables larger 10 mm2

TN-C-S System    - system with PE conductor starting within the installation

TT System    - system with separate PE conductor (connected to earth), older installations

IT System    - system without neutral conductor, older installations