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3 Phase + Neutral 400/230V unbalance:

Nick Parker

I came across a circuit drawing for lighting distribution panel 3P+N (400/230V) .

There are 3 phase and 1 phase (Phase to Neutral) loads connected to this Distribution panel. Apparently, there would be unbalance current between the phases due to the single phase loads as it is not connected evenly across all the phases.

Do the breaker trips for the unbalance current due to the current flowing in the neutral? Do I need to increase the earth fault setting? Typically what is the earth fault setting for this configuration? Do I have to care of any other issues associated with it?

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    It is usual these days to have a 'full size' neutral, i.e the same size as any one phase. As such, the largest load on any one phase is the worst that the neutral may carry, if there is no load on the other phases, but in general it is less. There are some problems with electronic loads that only draw current for part of the mains cycle - usually the crests, as then the cancellation does not occur, as the current  bursts are at different times.

    Mike.

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    It is usual these days to have a 'full size' neutral, i.e the same size as any one phase. As such, the largest load on any one phase is the worst that the neutral may carry, if there is no load on the other phases, but in general it is less. There are some problems with electronic loads that only draw current for part of the mains cycle - usually the crests, as then the cancellation does not occur, as the current  bursts are at different times.

    Mike.

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