Lesson 8 of 21
In Progress

TN-C-S System

NAC-Trainer March 11, 2020

A TN-C-S system, shown in the image below, has the supply neutral conductor of a distribution main connected with earth at source and at intervals along its run. This is usually referred to as protective multiple earthing (PME). With this arrangement, the distributor’s neutral conductor is also used to return earth fault currents arising in the consumer’s installation safely to the source. To achieve this, the distributor will provide a consumer earthing terminal that is linked to the incoming neutral conductor.

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