Single or double pole fused spur

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Went down an internet rabbit hole looking for SP FCUs.

Found this, which is all over the place:

upload_2022-3-11_8-51-24.png


From here: https://uk.rs-online.com/web/generalDisplay.html?id=ideas-and-advice/fused-spurs-guide
 
The comment someone made about the fuse size depending on the cable size and all that is all very well if you can do the maths, but your theory about the fuse being just over the current rating of the mat is absolutely fine.
There is no maths involved. Cable ratings are tabulated. Fuse ratings are on the fuse.
 
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