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Why isn't there a 3186Y Cable (6-core)

AncientMariner
Why isn't there a 6-core cable in the 318nY style, ie 3186Y?


There is a 3185Y 5-core where the cores are Black, Blue, Brown, White & Green/Yellow and a 3187Y 7-core where the cores are Black, Blue, Brown, Grey, Red, White & Yellow.


Also a 5-core cable where one of the cores is NOT Green/Yellow?


It will, I guess, be down to demand, but for rewiring say a Siemens Wireless Thermostat where the Receiver Unit needs L + N  together with c + n/o & n/c  a simple 5-core cable would be so much more straightforward.


(Due to occasional unreliability, I need to re-position the Receiver Unit the other side of a brick wall lined with foil backed plasterboard.)


Clive
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    Probably demand and (like Charles Renard's preferred numbers) it's often more efficient to make a limited number of things and waste a little by using one slightly too big, than make every possible size.


    There might also be some manufacturing reasons - certain numbers of strands - e.g. 1, 3, 7, 19 etc pack nicely into an (approximation of) a circle - other numbers would need additional fillers and result in the same size cable overall despite the fewer cores - so savings might be even less than imagined.


    So I guess either use a 7-core and waste on core, or use a 6242Y (L&N+cpc) + 6243Y (C,NO,NC+cpc)


       - Andy.
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  • 0
    Probably demand and (like Charles Renard's preferred numbers) it's often more efficient to make a limited number of things and waste a little by using one slightly too big, than make every possible size.


    There might also be some manufacturing reasons - certain numbers of strands - e.g. 1, 3, 7, 19 etc pack nicely into an (approximation of) a circle - other numbers would need additional fillers and result in the same size cable overall despite the fewer cores - so savings might be even less than imagined.


    So I guess either use a 7-core and waste on core, or use a 6242Y (L&N+cpc) + 6243Y (C,NO,NC+cpc)


       - Andy.
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