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Are two lengths of 6mm cable (joined like for like at both ends - consumer unit and shower) the same as one length of 10mm cable? effectively 12mm? or does that simply not work? should I just replace with a 10mm and be done with it? It is going to be a pain in the *rse replacing some of this...

Just a quick question really - is 6mm cable sufficient for running a 10.8kW shower? I have replaced a 6kW electric shower with a 10.8kW one. I have replaced the breaker in the consumer unit and upgraded it from a 32A to a 45A. I have checked the isolating switch (pull cord thing) and it is...