Just been reading about this cable that has been imported from China, apparently the plastic used in the insulation on the cores and sheath lacked thermal polymers, these prevent the insulation from becoming brittle when exposed to high temperatures, either from the cores themselves or ambient temperatures up in roof voids.

I'd be rather worried if I'd installed some of this, it could cost a bit to replace it, especially if you have to rip a new house to bits to get the old cable out.

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