I have a 4mm radial (via 32A RCBO) which will have a a 2.5mm spur off to an IP rated exterior socket on the outside wall of the house. I intended to use a 13A fused double pole FCU with the spur off, thereby having isolation to outside, and a fuse on the spur for good measure. These are available and I suppose have fuse on live but double pole isolation.
But, the switch needs to look good and match others nearby which are flat plate screwless designs (BG range from Toolstation). And in that design I can only find single pole FCUs with no isolation to outside (neutral always connected).
So how important is double pole isolation to the exterior socket ?
Thanks, Simon.