On Thursday, 12 May 2022 08:09:46 EDT Robin Szemeti via Emc-users wrote: > And the new system is much better. Previously, when grubbing around in > the back of oily machinery, in poor lighting it was easy to get > confused with red yellow and blue wires ... the black/grey/brown > colour scheme is much easier to see ... errm?
Yup, IMO a $genius at work. I wonder if part of that choice might be that its easier for color blind folks to detect? It certainly is a PITA for those of us with good color vision. In similar situations I've been considerably more explicit than errm? > On Thu, 12 May 2022 at 10:52, andy pugh <[email protected]> wrote: > > On Thu, 12 May 2022 at 06:31, Philipp Burch <[email protected]> wrote: > > > I could imagine that the colors are due to the usual coding (at > > > least in Europe) for AC circuits with brown=Phase (hot wire) and > > > blue=Neutral (cold wire). > > > > UK fixed household wiring used to be red for live and black for > > neutral. Then three-phase was red-blue-yellow with black neutral. > > > > In 2006 we harmonised with Europe, so that it is blue neutral, brown > > live and three-phase is brown-black-grey with a blue neutral. > > > > So, now when you find a wire: > > > > green/yellow - always earth > > black - live or neutral > > blue - live or neutral (already the case before harmonisation) > > brown - live > > red - live > > yellow - live > > grey - live > > > > In fairness, appliance flex has always been brown-live blue-neutral > > for as long as I have been wiring plugs, so it makes sense for the > > fixed wiring to match. But the colour choice for 3-phase seems odd. > > > > -- > > atp > > "A motorcycle is a bicycle with a pandemonium attachment and is > > designed for the especial use of mechanical geniuses, daredevils and > > lunatics." > > — George Fitch, Atlanta Constitution Newspaper, 1912 > > > > > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett. -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author, 1940) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
