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
TT DC system with the middle point of the supply connected to ground |
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 |
Related Article:
- Type of DC Network: Network insulated from ground
- Type of DC Network: Network with one terminal grounded
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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