13A Switch fuse spur

Hello, Does anyone know if there are regulations stating that the 13A switch fuse spur can run Continuously at is rated current for long hours? I find this intriguing because, when a spur operates at its maximum rating, it tends to overheat, but i can't find any regulation that explicitly states this isn't allowed. The only regulation i can find in the 7671 concern installation cable size, etc. I know that electricians need to take cable size into account during installation but most of them just follow the standard, without considering the 80% rule from current capacity. the issue i have is that, although it's good practice, i can't find a regulation explicity stating this. So, i'm not sure what to rely on when it comes to the regulations. Does anyone have any insights?? 

Parents
  • and realistically at 18C ambient and a unit under test  70C temperature -presumably on the outside where you can measure it, parts of the spur are quite a bit hotter inside. The plastics will age more rapidly and the whole thing may well have a short and uncomfortably hot life compared to running at half that load. Expect failure times measured  in years rather than decades.

    Or for sustained loads use a DIN box and an MCB or a 20A switch and protect elsewhere.
    Mike.

Reply
  • and realistically at 18C ambient and a unit under test  70C temperature -presumably on the outside where you can measure it, parts of the spur are quite a bit hotter inside. The plastics will age more rapidly and the whole thing may well have a short and uncomfortably hot life compared to running at half that load. Expect failure times measured  in years rather than decades.

    Or for sustained loads use a DIN box and an MCB or a 20A switch and protect elsewhere.
    Mike.

Children
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