As with most new showers, it is worth running in 10mm² to make it more future proof. The fact the space is unventilated does not really matter, so long as the cable can dissipate heat and is not surrounded by thermal insulation. Ambient temperature and other cables grouped are other factors which need consideration.
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local