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Fuses for showers.

Sparkingchip
From a electric shower installation manual:


Circuit Protection Table

Circuit Protection Device


Unit Rating (@ 240V)

8.5kW

MCB 40A

Cartridge Fuse 45A


9.5kW

MCB 40/45A

Cartridge Fuse 45A


Why a 45 amp cartridge fuse for a 8.5kW shower or for that matter even the 9.5 kW shower?


I presume it must be time related as the 8.5 kW shower will only load a 40 amp fuse to around 90% of its capacity.


How long can cartridge fuses be run at 90% capacity for?


 Andy B.
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  • 0
    The 35, 40 and 45 amp fuses are all the same physical size, Wylex made the fuse holders for the rewirable fuse boards with the orange bases and marked them maximum 45 amps, but sold them with all three sizes of fuse in them.


    I was trying to decide if there is a technical issue, rather than preferred sizes.


    Andy B
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  • 0
    The 35, 40 and 45 amp fuses are all the same physical size, Wylex made the fuse holders for the rewirable fuse boards with the orange bases and marked them maximum 45 amps, but sold them with all three sizes of fuse in them.


    I was trying to decide if there is a technical issue, rather than preferred sizes.


    Andy B
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