Or maybe a complete free-for-all with everything except the cpc - use whatever colours you like, then nothing could be assumed and testing would always need to be done.
That would have been nice, and it was tried, but there simply aren't enough colours. Using stripes would mean that a colour-blind person would be unable to distinguish the cpc.It would (IMO) just have been nicer ('safer', certainly initially) if the harmonised conductor identifications had been created in such a way that there were not 'contradictory overlaps' with the identifications previously used in all the countries concerned. That may not have been possible with single colours alone - but, as I've said, there's something to be said for 'stripes' etc. (they did it for G/Y).
If, for example, connecting an extractor fan to an existing (red/black) lighting rose I would sleeve the grey SL with brown at the rose and fan and the black with blue at the fan as required, although the fan terminal markings of PL, SL and N are a pretty good clue as to which is which.Which conductor would you oversleeve in blue?
As I said, I suspected that would be the case.That would have been nice, and it was tried, but there simply aren't enough colours.
As I said a few messages back, if one had different patterns of stripes, everything would be totally distinguishable even to a totally colour-blind person (albeit that's very rare!). Indeed, even for people with normal colour vision, the colours would then actually be redundant - all conductors could be, say, white, with (differing patterns of) black stripes.Using stripes would mean that a colour-blind person would be unable to distinguish the cpc.
I've seen/heard it many times, I'm sure at least some times here. I'll see if I can find anything.Where does "use grey for neutral to get out of the habit of using black" come from?
In the absence of any mandated practice, that uncertainty will always exist - so maybe it's a useful reminder that one has to be uncertain about both.It makes no sense (to me) because instead of being unsure whether black is line or neutral, we are now unsure whether the grey is as well.
I can understand both viewpoints about that.If joining harmonised and pre-harmonised in an accessory where black is neutral I would connect black to black.
Ah, yes, seen/heard many times.I've seen/heard it many times, I'm sure at least some times here.Where does "use grey for neutral to get out of the habit of using black" come from?
There obviously is not a 'need' if all conductors are correctly identified per the regs. However, we don't live in a perfect world. Mind you, don't forget that I'm just 'the messenger' - I don't think I would ever have come up with this 'need to dissociate black from neutral' idea myself. Indeed, so long as there are old-colour cables out there (and there probably still will be for a very long time to come!), a part of our brain has to remember that, in some situations, black without oversleeving can identify neutral.I just wondered who started it or where it started and if there actually is a need to disassociate black from neutral as any colour can be identified otherwise.
I've seen/heard it many times, I'm sure at least some times here. I'll see if I can find anything.Where does "use grey for neutral to get out of the habit of using black" come from?
Is it an attempt to say that the problem was caused by the colour change rather than the bumbling incompetence of the 'electricians'?You know whats coming don't you?
Well, yes, and so does BS7671, but that doesn't really help us much in this discussion (old yellow/blue and new black/grey are all line colours). Do they recommend which of them should be over-sleeved blue if one wants to use it as neutral?Marbo electrium consider grey is the replacement for yellow ... And black replacement for blue
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