6-core ≥230V-'rated' flex?

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Do you know why 6 core cable has never been available?
Well, as we've discovered, it is 'slightly available', but only just (in comparison with 5-core and 7-core).

I personally haven't got a clue as to the reason. One imagines that there is a lack of demand, but why demand should be dramatically less for 6-core than for, say, 7-core. Maybe there are common applications which require 5-core and 7-core, but not 6-core?

I've also tried to think of 'manufacturing' reasons, but I don't really see why it is any more difficult arranging 5 cores around a 'central' one than it is arranging 4 or 6.

Anyone got any ideas?

Kind Regards, John
 
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3P N E ... 3P N E and 2 control wires
Well, yes, I should have conceded that there would be a fair demand for 5-core - but is "3P NE and 2 control wires" necessarily more common than "3P N E and 1 control wire".

I actually suspect that once one gets beyond 5 cores the most common applications (like mine) are those in which multiple separately fed loads are being supplied by one cable (e.g. N E and a number of switched Ls).

Kind Regards, John
 
7 cores are required for star delta started motors. I imagine that’s why 7 core became a conventional thing back in the day.
 
I've also tried to think of 'manufacturing' reasons, but I don't really see why it is any more difficult arranging 5 cores around a 'central' one than it is arranging 4 or 6.
I doubt if it's a reason, but 6 cores around one central one is a natural layup without any fillers/spacers needed. 5 cores around a central spacer/filler is a necessity since 5 core is a commonly required cable.
It's possible that some manufacturers decided that by the time you add the fillers needed, 6 cores won't be all that much cheaper than 7 cores - and anything you can do with 6 cores can be done with a 7 core cable.
 

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