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TN-S - Additional PE Conductor

Nick Parker

Why in TN-S System PE Cables have to be provided in addition to the phase conductors for each loads (like socket, light fixture, Motor etc.)?
Don't bonding the enclosure of the loads (socket, fixtures, Motors etc.) to the local earth electrode or grid makes it sufficient and the fault current takes the route of enclosure --> earth electrode / grid --> return via mother earth to the source?

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    Nick seems to be asking why TN-S is not TN-C. The nomenclature is: T is Earth, N neutral, -C is common, -S is separated. The trouble with TN-C is that neutral voltage drops lead to various parts of the exposed conductive parts being at various different potentials. If everything were connected together with many extra (supplementary bonding)  cables this would not be a great problem, but ensuring that they were all in place would. It is satisfactory for supply cables, to say houses, because both combined neutral and Earth cables would not be simultaneously accessible. This would not be the case if TN-C were allowed inside a single area without much additional bonding.

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    Nick seems to be asking why TN-S is not TN-C. The nomenclature is: T is Earth, N neutral, -C is common, -S is separated. The trouble with TN-C is that neutral voltage drops lead to various parts of the exposed conductive parts being at various different potentials. If everything were connected together with many extra (supplementary bonding)  cables this would not be a great problem, but ensuring that they were all in place would. It is satisfactory for supply cables, to say houses, because both combined neutral and Earth cables would not be simultaneously accessible. This would not be the case if TN-C were allowed inside a single area without much additional bonding.

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