RE: UK Voltage

[Robert Chasmer <robert.chasmer@xxxxxxx>]

Keith Doxey [mailto:lists.diyha@xxxxxxx] wrote:
> It hasnt changed here yet for one reason.
>
> Our spec was 240V +/- 6%. but equipment was usually designed
> for +/- 10%.  There is an awful lot of legacy equipment the was
> designed to those limits
> That gives a designed working range of 216 - 264 volts.

240 @ 06%:  225.6v (0.94) <- 240.0v -> (1.06) 254.4v
240 @ 10%:  216.0v (0.90) <- 240.0v -> (1.10) 264.0v


> The new standard is 230V +/- 10% which is 207- 253 volts.

Why did they not tighten or keep the threshold the same +/- 6%

230 @ 06%:  216.2v (0.94) <- 230.0v -> (1.06) 243.8v
230 @ 10%:  207.0v (0.90) <- 230.0v -> (1.10) 253.0v

> If we had changed to 230V then the lowest permitted voltage is
> BELOW what some equipment was designed to operate on and early
> electronic equipment with Linear power supplies could fail to
> work properly. Anything with a Switch Mode PSU should be OK.

230 @ 6% fits within 240 @ 10%, but instead we make the boundries
even wider, Doh!


> I believe the plan is to wait a few years before dropping the
> voltage to the new level by which time the older equipment
> should be decomissioned.

Yer right, hows about 230 +/- 1%.

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