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Hi
Has anyone had any experience regarding insulation in walls on new builds as to what size mcb they are using for ring main circuits. I have checked the regs and seen that 100mm > insulation derates the cable capacity a fair bit. The builders are using 140 mm in the walls. I have pointed this fact out to them and told them that 2.5 cable on a 32amp ring is not ok?? The contracts manager says it's fine. He said its some special insulation. Im not to sure about it, even though it won't be me signing the insulation off. I was thinking of 20amp rings as its already wired and awaiting 2nd fix. Any advice please.
thanks
sean
Has anyone had any experience regarding insulation in walls on new builds as to what size mcb they are using for ring main circuits. I have checked the regs and seen that 100mm > insulation derates the cable capacity a fair bit. The builders are using 140 mm in the walls. I have pointed this fact out to them and told them that 2.5 cable on a 32amp ring is not ok?? The contracts manager says it's fine. He said its some special insulation. Im not to sure about it, even though it won't be me signing the insulation off. I was thinking of 20amp rings as its already wired and awaiting 2nd fix. Any advice please.
thanks
sean