Types of distribution systems for power supply

Power supply systems

Electrical systems differ on the basis of:

  • Current type: AC, DC, 3(N)AC
  • The type and number of live conductors in the system: L1, L2, L3, N resp. L+, L-
  • The type of system earthing: IT, TT, TN

The type of system earthing must be selected carefully as it essentially determines the behaviour and properties of the supply system. It is also a contributing factor to issues associated with system usage, such as:

  • Supply reliability and/or availability of power
  • Installation outlay
  • Maintenance, downtimes
  • Electromagnetic compatibility