Earthing System for Direct Current Distribution Systems According to IEC 60364

 

Sample Earthing of DC Distribution System | Source: ABB


The Standard IEC 60364-1 defines the direct current and alternating current distribution systems analogously:


Related Article: Earthing System According to BS 7671


TT DC System

A terminal of the system and the exposed conductive parts are connected to two electrically independent grounding arrangements. If necessary, the middle point of the supply can be connected to the ground. 

TT DC System

TT DC system with the middle point of the supply connected to ground

A terminal or the middle point of the supply is directly grounded; the exposed-conductive parts are connected to the same grounded point. Three types of TN systems are defined according to whether the grounded terminal and the protective conductor are separated or not
TT DC system with the middle point of the supply connected to ground


TN-S DC System
The conductor of the terminal connected to the ground and the protective conductor Gnd are separated.


TN-S DC System



TN-S DC system with the middle point of the supply connected to ground 



TN-C DC System

The functions grounded terminal and protective conductor are partially combined in a single conductor called Ground.


TN-C DC System


TN-C DC distribution system with the middle point of the supply source connected to ground 

Related Article: 


TNC-S DC system

the functions of the grounded terminal and of the protective conductor are partially combined in a single conductor called GndN and partially separated.


TN-C-S DC distribution system 



TN-C-S DC distribution system with the middle point of the supply source connected to ground


IT DC System

TN-C-S DC distribution system with the middle point of the supply source connected to ground.

IT DC distribution system 


IT DC distribution system with the middle point of the supply isolated from ground


Source: 

  • ABB Circuit Breakers for Direct Current Applications | pp. 41- 44
  • Publisher: ABB
  • Download Here

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