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very useful, thanks.

Does such a thing exist made from plastic?

PS Not all cable duct is surrounded by concrete, it could be sand / dirt, or as dug material. G

Hi It has to have an effect surely. The twinwall has trapped air within it's corrugations, and we know that this will prevent the heat from disapating, more so than if it was a solid wall pipe. I'd say that equation was not designed for twinwall pipe. G

Hi, New member her. Hello to everyone, looking forward to receiving and giving hlepful tips. Does anyone have any experience or information on the effects of cable duct made from different materials, or of diferent type, on the derating of the cable. Normally it's PVC duct, or solid wall PE...