You would look at the structure of the cable.
That is rarely done. However, you seemed to be saying that it was a 'requirement' for the insulation of a phase conductor to be brown whereas, in the UK (and this is the "Electrics UK" forum), over-sleeving with brown at the terminations is acceptable.
Now the crazy thing is an installer could decide to identify the wiring with brown as L, blue as N, yellow as SL, strappers as Grey etc. Power circuits: white for ring L, purple for shower L etc. If there was a list available one would be hard pushed to fail it on an inspection.
I never suggested that oversleeving wasn't acceptable - that would however make it a brown conductor.
Fair enough. In that case, I obviously misunderstood you, perhaps because I thought that you had been known to suggest that over-sleeving was not acceptable in some (non-UK) places (but maybe I'm wrong about that as well).
By its position relative to the N or E, same as working with cables, like YY flex having multiple Black cores
We quite often hear about non-UK territories where over-sleeving is 'not allowed' (or, at least, 'deprecated'), such that brown+brown T+E is used for 1-way light switches, but I don't know what they do about 2-way switching, since I've never seen, nor heard, of brown+brown+brown 3C+E. Maybe they use two cables, or even singles? A foreigner may be able to tell us.
The non-UK country I was talking, and asking, about is not in mainland Europe but, rather, had a land border with the UK.
Not difficult. Just use traditional two-way switching rather than conversion method. If you really wanted to use the conversion method for some reason then use a twin brown and an insulated and sheathed single brown. Very easy.
Being old and stuck in my ways, I very often do just that BUT, whenever possible, use 3-core cable, carrying the neutral as well as the two strappers.
As I said, that would be one solution, but I would call it 'messy' and 'inconvenient', even if fairly 'easy'. Am I right in assuming that 'triple brown' 3C+E does not exist, even in countries such as we are discussing?
None of that means much to me, and would probably be best discussed in the "Electrics Outside of UK" forum.
Neither I nor my wholesalers have come across 3-core & Earth cable, so I would suggest that it doesn't exist (or at least not for single phase use).
Bit inconvenient. Wonder if much finds its way as a grey import across the border.
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