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- 1,230
Yes it is. Of course 4mm would, nt meet any parameters and of I,m not suggesting it be used. What I am suggesting is there might be reasons to reconsider how we calculate cable size for loads like electric showers which in reality tend to be used a lot more sparingly than perhaps other loads like heat pumps which have more constant use . My shower is an 8.5 kW wired in 4 mm. The OP is talking about installing the same shower in 16mm.Are we missing something?It’s bad practice though isn’t it, when carrying out EICR’S I code it as a C3 with no thermal effects and downgrade mcb to 32A rather than the 40A installed. If I’m asked to replace faulty shower which is 8.5kw or above on a 6mm cable I will renew cable with 10mm it’s the right thing to do isn’t it.
I regularly see 6mm covered in insulation in family homes where the shower is used 4 to 5 times a day without no obvious side effects