Cable size for electric shower

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Hi all,

We are trying to ascertain what size cable we have for our current electric shower as we are purchasing a new one and need to know what kw we can get. The current shower is 8.5kw and ideally we'd like to go a little more powerful. Can anyone tell whether the current cable is 6mm or 10mm just by looking at the attached pictures??

Thanks in advance
 

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If the cables earth conductor is single solid copper ,rather than stranded it is NOT 10mm²
There appears to be more than one earth conductor coming into the shower, take a very close look at the one that is within the supply cable.
 
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I think that looks thin, our 10.5 KW Triton has 4mm² Tri rated internal wiring so I assume it will be the same across the range.
The T&E diameter looks thinner, I suspect that means it's 4mm²
 
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