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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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    I'll be using 7-core.  But I bet some would use 5-core (of which one core is G/Y) and perhaps over sleeve the G/Y. Not my style though. Although that is what the original electrician brought in by the heating engineer did and then ran a seperate Green/Yellow for earth! 

    Clive
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    I'll be using 7-core.  But I bet some would use 5-core (of which one core is G/Y) and perhaps over sleeve the G/Y. Not my style though. Although that is what the original electrician brought in by the heating engineer did and then ran a seperate Green/Yellow for earth! 

    Clive
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