The nominal voltage did and has.The voltage did NOT suddenly drop by 10 volts on that date and does not seem to have dropped since either.
The nominal voltage did and has.The voltage did NOT suddenly drop by 10 volts on that date and does not seem to have dropped since either.
The nominal voltage did and has.The voltage did NOT suddenly drop by 10 volts on that date and does not seem to have dropped since either.
No need to, and it's better than the stuff they're installing new now anyway. No doubt it will be scrapped within a few years when the supplier has a changeout program, but if checked for calibration and re-installed that meter could still be going strong in another 40 years. Somehow I doubt the all-singing, all-dancing meters they're installing now will be around for a fraction of that time.If so then I don't think anyone would change a meter purely based upon its age!
Would 398 sound better?Grew up with 240/415 and now when folk talk about 230/400 the 400 part just doesn't seem right
I grew up in the days of 210/365 V. IIRC it was about 1962 to 1964 that SWEB moved its customers in my area from 210/365 to 240/415. I remember we received new lamps (light bulbs) for free, and electric fires were taken away, and came back with new elements. Funny how this didn't happen when Europe standardised on 230/400!!!!!
Much of southern California was originally 50Hz, with Los Angeles converting to 60Hz in the 1930's and many other areas in the late 1940's. The utility companies offered replacement/adjustment programs for synchronous clocks and similar devices.I grew up in the days of 210/365 V. IIRC it was about 1962 to 1964 that SWEB moved its customers in my area from 210/365 to 240/415. I remember we received new lamps (light bulbs) for free, and electric fires were taken away, and came back with new elements.
When was that the voltage, I always thought it was 250volt originally.I grew up in the days of 210/365 V.
It's not so much a question of when but of where. Different districts had different nominal voltages prior to the standardization nationwide at 240V. Some were as high as 250V, some were as low as 200V, and there were also a few places operating at 100/200 - 125/250V split-phase. Then there were d.c. districts with similar voltage variations.When was that the voltage, I always thought it was 250volt originally.
I can't speak for others, but Fluke MFTs certainly calculate PEFC and PSCC by dividing by the actual measured voltage by the loop resistance.I remember having a loop impedance tester and 1.44 Ω would always when switched to prospective short circuit current would always show 166.7 amp what ever the voltage was, clearly it assumed 240 volt.
AFAIAA, unless one uses something like a Wheatstone Bridge, there is no direct way of measuring resistance - so it nearly always has to be calculated from voltage and current.I asked the question did it measure amps and convert to ohms or ohms and convert to amps? Likely measured amps.
The 440 figure is from a nominal 250V supply, which comes out as 433V phase to phase, so round up to 440V.440 the latter seems the odd one out as from single phase of 254 volt so quoting maximum voltage rather than mean voltage.
Except nothing actually changed voltage wise.
I'd be interested to know whether that is the case. If I were them, I think I might be tempted to (still) stick closer to 240V (if not higher - see below), thereby giving more scope for VD before the voltage supplied to consumers becoming less than the 'permitted minimum'.So in essence all that changed was the official specification. Many sub transformers still put out 240V as they did back decades ago. Now for new sub transformers, I would guess they are designed to put out the more recent nominal 230v; although In reality they could put out anything between 216.2v and 253v.
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