3 phase head in a single phase meter Uk energy networks saying I'm not 3 phase

[davesparks]

I realise its the 'correct' voltage, but how often do you measure a single phase supply and it is 230? It is usually more as we seem to be a 230V country on paper only, so i am assuming most 3 phase supplies are still 415V.

It is not correct, it is nominal, that is to say it is the voltage which has been named as the theoretical value.
The actual voltage which all public network distribution transformers in the UK output is 250/433V, this is a material fact which will not change.

 

[Risteard]

Then that would be untruthful and incorrect. A measured value is exactly that, the value which has been measured. It is different to the nominal value which is the theoretical or named value.

No, because the voltage must be recorded as the nominal value. So by measuring 400V that is anywhere between +10% to -6%. It is still 400V and should be described as such.

The measurement is merely to confirm that there is 400V there, and not to see whereabouts it is within the accepted tolerance for that nominal voltage.

Meters have an accuracy within a certain percentage too so who is to say how accurate your reading is?

 

[davesparks]

No, because the voltage must be recorded as the nominal value. So by measuring 400V that is anywhere between +10% to -6%. It is still 400V and should be described as such.

The measurement is merely to confirm that there is 400V there, and not to see whereabouts it is within the accepted tolerance for that nominal voltage.

Meters have an accuracy within a certain percentage too so who is to say how accurate your reading is?

That is a ridiculously blinkered approach.
This is supposed to be a technical trade and electricians should be able to understand the basic scientific principles behind it.
If you are reporting a measured value then it must be the value which was measured, if you are reporting a nominal value then it should be the nominal value.

 

[Risteard]

That is a ridiculously blinkered approach.
This is supposed to be a technical trade and electricians should be able to understand the basic scientific principles behind it.
If you are reporting a measured value then it must be the value which was measured, if you are reporting a nominal value then it should be the nominal value.

All he asked for someone to check was whether he had a three-phase supply, i.e. 400V between phases.

Why on earth would it be relevant what the precise meter reading is (and notwithstanding the fact that a meter reading has an inherent inaccuracy anyway)?