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Hi All,

I am Faraz, I'm a Mechanical Project Engineer by trade. This is my first post on these forums.

I am looking for some insight into a problem I'm having.

I currently have a 6mm Cable running from the main RCD to a 9.8kW shower in a Granny Annexe. the wire currently runs about 25m long to the Annexe and is run underground from the main property. Now I've always opposed to having a 6mm cable for this application but my father was adamant 6mm was plenty and thus installed it. I believe its a 30A RCD. The shower constantly trips (not surprised) and can't be used for more than 2mins at best before it trips.

For a cable length of <5m I would personally go for 10mm cable and 45A fuse. But I feel that due to the length it would make more sense to go upto a 16mm cable due to the length.

Is 16mm SWA cable overkill? Is 10mm SWA fit for purpose? Average shower time is 15mins total.

Please note this Annexe was a shed before and so I am in the process of correcting the wiring according to the local council's safety regs.
 
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