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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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    I should have detailed more. By Local earth electrode / grid, I meant the all the earthing connections of the plant are interconnected including the plant transformers neutral. I think in that case, it becomes TN-C in the plant premises. But I do not understand specifying of additional PE conductor in this case

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    I should have detailed more. By Local earth electrode / grid, I meant the all the earthing connections of the plant are interconnected including the plant transformers neutral. I think in that case, it becomes TN-C in the plant premises. But I do not understand specifying of additional PE conductor in this case

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