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 mm
2
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