5 types of Earthing Systems
TN-S Earthing System
TN-C-S Earthing System
TT Earthing System
TN-C Earthing System
IT Earthing System
T - for Earth (from the French word Terre)
N - For Neutral
S - For Separate
C - For Combined
I - For Isolated (The source of IT system is whether
Jointed to earth through a deliberately introduced
Earthing impedance or is isolated from Earth. All
Exposed-conductive-parts of an installation are
Connected to an earth electrode)
When someone designing an electrical installation, one of
The first things to determine is the type of earthing
System. The distributor will be able to provide this
Information
The system will either be TN-S Earthing, TN-C-S Earthing (PME) or TT Earthing for a low voltage supply given in accordance with the
Electricity Safety, Quality and Continuity Regulations 2002 This is because TN-C Earthing requires an exemption from the Electricity Safety, Quality and Continuity Regulations, and an IT system is not permitted for a
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