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Scott F
client has old shower he wants replacing with 9 maybe 10kw.He has 6ml cable under floorboards which will be covered by 40 amp rcbo >now this is the part im struggling with according to table 4d5 ref meth c rating is 47 amps but if the cable runs under the floor with other cables does this make it ref meth 100* in which case it woukld be 34amps so would need either upgrading to 10ml or lowerd output on the shower hope this makes sense