My aunty had a 8kw shower fitted a few years ago 6mm cable on 40a mcb, couple years later she got a new 10.5kw shower and it appears the cabling or mcb sizes were not touched just the shower replaced, this worked fine for another couple of years until it died recently, and so they bought pretty much the same 10.5kw model (only slightly newer version).
They found now that altering the temperature dial, would only give them hot water at top position and any other setting would be cold. So I had a look and apart from the cable being too small couldnt see annything else that was wrong.
They got a engineer from Gainsbourough out to look at it and he confirmed that the shower was ok but as I had mentioned the cable was too small.
So can any one help me to understand how the cable size would cause this as although the cable is only 6mm it is still capable of handling around 47a (max without factors considererd) so my assumption was that the shower would work as should but the cable would be under strain and overheat or the breaker would pop on overload.
Im assuming as the cable heats up resistence rises and so effectively not enough current to heat the water as required but would appreciate the input.
They found now that altering the temperature dial, would only give them hot water at top position and any other setting would be cold. So I had a look and apart from the cable being too small couldnt see annything else that was wrong.
They got a engineer from Gainsbourough out to look at it and he confirmed that the shower was ok but as I had mentioned the cable was too small.
So can any one help me to understand how the cable size would cause this as although the cable is only 6mm it is still capable of handling around 47a (max without factors considererd) so my assumption was that the shower would work as should but the cable would be under strain and overheat or the breaker would pop on overload.
Im assuming as the cable heats up resistence rises and so effectively not enough current to heat the water as required but would appreciate the input.