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?? 

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  • In general the ratings of things should normally be their continuos rating.. but some standards do have other ideas. I guess you'd need to refer to BS 1363 to see precisely what it demands.

    The traditional way to overheat a 13A fused connection unit was to use it to supply a3kW (at 240V) immersion heater - although the real cause was the ambient temperature in the airing cupboard rather than the current - I think BS 1363 expects something like an average of no more than 25 degrees.

    That said, 13A plugs/sockets have been known to cause problems when feeding EVs - there are now special "EV" marked sockets that have a true 13A continuous rating.

       - Andy.

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  • In general the ratings of things should normally be their continuos rating.. but some standards do have other ideas. I guess you'd need to refer to BS 1363 to see precisely what it demands.

    The traditional way to overheat a 13A fused connection unit was to use it to supply a3kW (at 240V) immersion heater - although the real cause was the ambient temperature in the airing cupboard rather than the current - I think BS 1363 expects something like an average of no more than 25 degrees.

    That said, 13A plugs/sockets have been known to cause problems when feeding EVs - there are now special "EV" marked sockets that have a true 13A continuous rating.

       - Andy.

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