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20mm diam

Thanks, will look into that tomorrow, thinking i may get an electrician in.

The rcd is in its own box in the shower line from the consumer unit via a 50a breaker and a 100a main breaker

The cable is run in pvc conduit, loose under floor boards and in capping on outside bathroom wall.

Thanks Spark123. I have also noticed that the calculator says that i should use 16mm but the 10mm is rated for 53. Should i use 16mm cable?

Replacing a 7kw shower with a 10.5kw. I think the cable is a 6mm so replacing with a 10mm. The original was the three red, black and green loose in a conduit from the consumer unit to twin pole isolator to shower 8 meter run. The consumer unit is a Hager which was fitted with a 32A breaker...