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Neutral Distributed / Non Distributed

Nick Parker
Explain me the difference between a neutral not distributed and with neutral distributed.


(3 Phase + 1 Neutral) loads -- > Is this termed as distributed neutral?

(1 Phase + 1 Neutral) loads  -- > Is this termed as distributed neutral?

3 Phase, for example motor  --> Non distributed neutral?

2 Phase, for example lighting fixtures -- > Non distributed neutral?,


I would like to apply the relevant equations to find the short circuit at the end of line. That is why this question came up.

e0ad2d78a7db489c6dec116697fc0792-huge-neutral-distributed-vs-non-distributed.png

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    You do not normally say 'neutral distributed' in the case of single phase circuit, but of course it more or less always is, except  in the cases like centre tapped 110V building site supplies which are really 55-0-55, and you sort of have 2 live conductors relative to earth.


    In a 3 phase system it gets more complex, you may have a 2 wire 400V load - like floodlights on a large sports facility where volt drop on 230 would be undesirable, then the neutral may well be distributed part way round the wiring for the odd 13A socket or other low load, even though it is not taken all the way to, nor is used by, the main load.

    Things like delta connected motors and transformers do not need a neutral so 3 lives and an earth may be all that is provided, that is another example of  'non distributed' past a certain point.


    The question really hinges on credible fault conditions - phase 1 to phase 2 or one phase to ground or neutral, or indeed the 3 phases bolted fault.

    It is really important to be clear which you are considering, and which you are testing directly and which you are just deducing from the test readings. Your meter may do 3 phase to neutral tests, and estimate a phase to phase fault figure for example.

    mike,
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  • 0
    You do not normally say 'neutral distributed' in the case of single phase circuit, but of course it more or less always is, except  in the cases like centre tapped 110V building site supplies which are really 55-0-55, and you sort of have 2 live conductors relative to earth.


    In a 3 phase system it gets more complex, you may have a 2 wire 400V load - like floodlights on a large sports facility where volt drop on 230 would be undesirable, then the neutral may well be distributed part way round the wiring for the odd 13A socket or other low load, even though it is not taken all the way to, nor is used by, the main load.

    Things like delta connected motors and transformers do not need a neutral so 3 lives and an earth may be all that is provided, that is another example of  'non distributed' past a certain point.


    The question really hinges on credible fault conditions - phase 1 to phase 2 or one phase to ground or neutral, or indeed the 3 phases bolted fault.

    It is really important to be clear which you are considering, and which you are testing directly and which you are just deducing from the test readings. Your meter may do 3 phase to neutral tests, and estimate a phase to phase fault figure for example.

    mike,
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