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Earthing systems

TN-S Earthing System Explained

TN-S is easiest to recognise conceptually by keeping the neutral and protective-earth functions separate rather than combining them into a PEN conductor in the supply path shown.

1

Separate conductors

The neutral carries normal return current while the protective-earth path exists for protective purposes. The two functions are shown separately in the VoltMate model.

2

Fault-return concept

A line-to-exposed-metal fault should have a protective return path toward the source so the protective arrangement can operate under the design conditions.

3

Learning boundary

The simplified model teaches the system concept. It is not a substitute for identifying the actual distributor arrangement or verifying conductor suitability on site.

Key ideas

Neutral and PE are separate functions
PE is not a normal load-current path
Verify the real supply arrangement before work

Related search terms

TN-S explainedTN-S earthing system UKTN-S vs TN-C-S

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VoltMate learning content is simplified for education and revision. It is not a substitute for current standards, manufacturer instructions, site information, competent judgement or an approved safe system of work.