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TN-S with and without Neutral conductors

Nick Parker

Hello everyone,

What are the advantages/disadvantages of using TN-S system with and without Neutral conductors?. Where does it find its application?

ef55b21f1eb9a73bb3f7e8e85eaf7368-huge-tns_without-neutral.png
Without Neutral
387a1fc1393546c05a30da338234ce61-huge-tns_with-neutral.png
With Neutral
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    There is no need for N if the three phases are perfectly balanced because no current would be flowing in it. However, if you don't put one in, you cannot then have single phase appliances downstream. The classical example is a machine with a three phase motor and a single phase lamp.

    I suppose the disadvantage of putting in a N when you don't need it is that you are wasting resources.

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  • 0

    There is no need for N if the three phases are perfectly balanced because no current would be flowing in it. However, if you don't put one in, you cannot then have single phase appliances downstream. The classical example is a machine with a three phase motor and a single phase lamp.

    I suppose the disadvantage of putting in a N when you don't need it is that you are wasting resources.

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