View the thread, titled "Sizing of a cable for a shower." which is posted in DIY Electrical Advice on Electricians Forums.

Hi, am looking to upgrade my electrical shower from 9.5 to 10.5kw and am unsure if my cable is upto the job as its 6mm attached to a 40A fuse. The length of the run from fusebox to shower is approx 12-15m so I am trying to check if its a viable project as I have no desire to upgrade the cable to 10mm given the route.
If there is a formula for this calculation then that would be a big help.
Thanks
 
What do the manufacturers instructions say? I would expect they would say 10mm cable as 10.5kW (45.6Amps) and the instructions would/should override any calculations.

I really depends on how the cable is installed - for example from the IET Wiring Regulations, if run in insulated stud wall its current carrying capacity (CCC) could be as low as 27.5A . Enclosed in a plastered wall - 32A so you see way below what a 10.5kW shower would draw.
 

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Sizing of a cable for a shower.
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