Well, the slightly tongue in cheek answer is that  perhaps you should not trust software you have not written to do sums that you can verify with fingers (and maybe toes if you want a second decimal place), it is quite possible the software writer does not understand 3 phase, or has made a typo in the code. And any one who spells the word 'star' as w, y and e is probably not a native sparky, but then some of us say "ground" when we mean "earth".


Be aware that the  phrase "230V 3 phase" could  be taken to mean 230V between phases - so about130V to neutral on each phase, which would be a closer fit to the 20 odd amps. So the normal low voltage 3 phase in the UK street can be described both as 230V single phase and 400V 3 phase (to within the accuracy of assuming that 400/230 is root 3, which it is not quite.)

If in doubt say "XX volts phase to phase" or "YY volts phase to ground" to be utterly clear, or give both voltages (230/135 is not the same as 400/230).


In the same way the 11kV overhead lines (the three horizontal wires on wooden poles yomping over fields to supply transformers near small villages) is commonly called 11kV 3 phase (there is no HV neutral) even though each line is about 6.6kV to earth.

Well, the slightly tongue in cheek answer is that  perhaps you should not trust software you have not written to do sums that you can verify with fingers (and maybe toes if you want a second decimal place), it is quite possible the software writer does not understand 3 phase, or has made a typo in the code. And any one who spells the word 'star' as w, y and e is probably not a native sparky, but then some of us say "ground" when we mean "earth".


Be aware that the  phrase "230V 3 phase" could  be taken to mean 230V between phases - so about130V to neutral on each phase, which would be a closer fit to the 20 odd amps. So the normal low voltage 3 phase in the UK street can be described both as 230V single phase and 400V 3 phase (to within the accuracy of assuming that 400/230 is root 3, which it is not quite.)

If in doubt say "XX volts phase to phase" or "YY volts phase to ground" to be utterly clear, or give both voltages (230/135 is not the same as 400/230).


In the same way the 11kV overhead lines (the three horizontal wires on wooden poles yomping over fields to supply transformers near small villages) is commonly called 11kV 3 phase (there is no HV neutral) even though each line is about 6.6kV to earth.