Logo Roller und Fischer

Produkt-Infos

Mains shapes

1. Letter: Type of transformer earthing
- T direct earthing of star point
- I isolated star point

2. Letter: Type of consumer earthing
- T direct earthing of the consumer
- N direct connection of bodies (consumer) to star point

3. Letter: Kind of installing protectiv and mid-point conductor in TN-network
- S protective conductor and mid point conductor are installed separately
- C protective conductor and mid point conductor are combined

TN-S-System

  • Transformer star point grounded directly via earthing RB
  • Body connected to earthing RB via protective conductor
  • Protective and mid point conductor are seperated in whole system

TN-C-S-System

  • Transformer star point grounded directly via earthing RB
  • Body connected to earthing RB via protective conductor or PEN
  • Protective and mid point conductor are partly combined to the PEN-conductor and partly seperated

TN-C-System

  • Transformer star point grounded directly via earthing RB
  • Body connected to earthing RB via protective conductor
  • Protective and mid point conductor are seperated into two conductors in the whole system

TT-System

  • Transformer star point grounded directly via earthing RB
  • Body directly connected to earthing RA

IT-System

  • Earthing of all active parts
  • Body directly connected to earthing RA

Asymmetrical System

  • One phase directly connected to earthing RB
  • Body directly connected to earthing RA