What % of the time do you measure 230V vs 240V?

[us_sparkey]

When your out working on a building and measure the incoming mains, with a good quality multi-meter, say at the consumer unit how often do you get 230V vs 240V?
Cheers

 

[nicebutdim]

In the UK anything within the range of 230V -6% to +10% is acceptable, so anywhere from 216.2V to 253V. When nominal voltage here changed from 240V to 230V, there was no change in supply voltage.

 

[poni]

When your out working on a building and measure the incoming mains, with a good quality multi-meter, say at the consumer unit how often do you get 230V vs 240V?
Cheers

don't think I have ever got dead 230V or 240V its aways 230 and a Bit or 240V and a bit

 

[Fleeting]

Month or so ago at a new substation 242v.

 

[kerching]

Never really concerned me, if it’s in tolerance then I’m not interested. When I did BFO machine tool control systems one of my clients went for ISO9000 some suit rocks up wanting to see certs calibrating my meters to 2 decimal points. I explained to this 'clipboard,' that I knew what the voltages should be 6,12,24,50,110,230,415,660 or thereabouts and exact values were not required! He said they were in their 'quality manual', I suggested it was rewritten

 

[ProDave]

I have NEVER seen <240V in a domestic property. Our "230V" specification is lip service.

 

[us_sparkey]

In the UK anything within the range of 230V -6% to +10% is acceptable, so anywhere from 216.2V to 253V. When nominal voltage here changed from 240V to 230V, there was no change in supply voltage.

Yeah thats what I understood that the standard changed but the your utility grid did not run out and change anything. I am just curious now that its what 30 odd years later did they lower the supply to 230 when upgrading distribution transformers or is it still pretty much 240?
Cheers

 

[nicebutdim]

Yeah thats what I understood that the standard changed but the your utility grid did not run out and change anything. I am just curious now that its what 30 odd years later did they lower the supply to 230 when upgrading distribution transformers or is it still pretty much 240?
Cheers

The vast majority of single phase measurements I take would be around 240V - high 230s to mid 240s.

 

[UNG]

Back in the mid 90's when the 1st stage of the EU voltage harmonisation came in Manweb one of my local DNO's held a meeting for electrical contractors to explain what it meant for the existing supply network and future upgrades, the immediate outcome was that 240v was within the tolerances so there would be no rush to modify the network and the upgrade work to lower the voltage to the nominal 230v would take around 30 - 40 years based on the existing maintenance and replacement schedule

With regard to measured network voltages these days I quite often see anything from 242v to 252v and occassionally as high as 262v which seems to happen more when there is a lot of local PV installed
Back in 2011 I was working in a premises close to where a large building project was in progress and a new packaged sub station was installed to reinforce the local network to accomodate the increased load at peak times the voltage dipped to 209v - 211v depending which phase you tested that turned out to be some auto tapping issues with the local tranformer

 

[binky]

my own house is 244, and most of my area is around the same.

 

[ProDave]

We are overhead supply with a pole mounted transformer. A few years ago we had a power cut, the transformer had gone bang, so they fitted a new one. You might have thought the new one would have been wound for 230V, but no we have the same about 242V just as with the old one.