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Two Phase CU

Good morning,

Came across a strange one doing an EICR yesterday.

The fuse board is fed with two phases and one neutral...phases L2 and L3 are linked.

I'm looking for a coding or deviation.

As I see it, best way is it's unbalanced loadings with pressure on the neutral.

Worst way is two supply circuits with a shared neutral.

The spare phase is being used to supply a flat in the building.

Loading wise, it would be possible to link out all phases in the main CU, making it a single phase board...but that would only push the problem back to the intake.

Any suggestions please.

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0 ebee over 4 years ago

I must admit that I`m struggling to see a problem unless I`ve missunderstood it.

Forgeting harmonics for now then a 3 phase supply running 1 or 2 or 3 single phase loads would only cause phase imbalance to the supplier. (I`m assuming the N tail is same size as the phases). If everbody had say single phaes loads on three phase supplies and the were all on RED phase (sorry Brown) example then yes the supplier might not be happy but if the supplies were balanced to a degree then no problem
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0 ebee over 4 years ago

I must admit that I`m struggling to see a problem unless I`ve missunderstood it.

Forgeting harmonics for now then a 3 phase supply running 1 or 2 or 3 single phase loads would only cause phase imbalance to the supplier. (I`m assuming the N tail is same size as the phases). If everbody had say single phaes loads on three phase supplies and the were all on RED phase (sorry Brown) example then yes the supplier might not be happy but if the supplies were balanced to a degree then no problem
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Two Phase CU

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