Is it a lot more awkward working on 3 phase systems compared with a domestic single phase system? if so what are the main points to watch out for from an experienced electricians point of view?
Is it a lot more awkward working on 3 phase systems compared with a domestic single phase system? if so what are the main points to watch out for from an experienced electricians point of view?
The Split Phase has the highest voltage of 460 between lines so really the voltage on standard three phase is lower than some single phase supplies.
Split phase is used where there is high demand but no rotating machines. For example a caravan site.
The 3.3kV will often be just two wire and the transformer pole mounted with often 2 x 100A fuses. Often people refer to it as being two phase but that is not really what it is.
As a matter of interest, why did they do that rather than just have two separate 240V secondaries? The only difference would be that the 480V secondary to which you refer would be broken at the centre point, but that would then remove the issue of 480V bewteen the two 'split phases'.So the transformer is single phase, has an 11kV primary and a 480V centre tapped secondary. I say 480V because I don't think any have been installed in the past 20 years.
Split phase is used where there is high demand but no rotating machines. For example a caravan site.
Other than with the three phase 110 volt supplies most 110 volt supplies have the colours Brown, Blue, and Green/Yellow yet we all know it should be Brown, Black, and Green/Yellow for a split phase supply. Blue is now only used for neutral.
As a matter of interest, why did they do that rather than just have two separate 240V secondaries? The only difference would be that the 480V secondary to which you refer would be broken at the centre point, but that would then remove the issue of 480V bewteen the two 'split phases'.
Fair enough, but that presumably only results in a current reduction in the neutral(s). Do they therefore distributes with the neutral conductor having a lower CSA?The whole point of the arrangement is to get 480V between the two outers to benefit from the reduction in current in the LV distribution cables. Just as with a three-phase system, the neutral carries only the imbalance current.As a matter of interest, why did they do that rather than just have two separate 240V secondaries? The only difference would be that the 480V secondary to which you refer would be broken at the centre point, but that would then remove the issue of 480V bewteen the two 'split phases'.
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