Fuses for showers.

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Sparkingchip:

When I did the 16th edition course the lecturer said the authors of BS7671 like cartridge fuses as they are very predictable and there’s not any chance of mechanical failure, so you know what to expect from them.


 Andy B.

Even B.S. 7671:2018 in Reg. 533.1.2.3 says that cartridge fuses are preferred to semi-enclosed fuses. I saw a promotional film once, made by a fuse manufacturer, extolling the virtues of cartridge fuses. The presenter said that the cartridge fuse is reliable, and when a new one is fitted it is totally unused and fully functional, unlike perhaps M.C.B.s where internal wear may occur with much use. Of course if the 8.5kW  (35.4 Amps) shower is rated at 240 Volts, its current will increase with a Voltage rise to say 250 Volts.


Z.

 

Zoomup:

Sparkingchip:

When I did the 16th edition course the lecturer said the authors of BS7671 like cartridge fuses as they are very predictable and there’s not any chance of mechanical failure, so you know what to expect from them.


 Andy B.

Even B.S. 7671:2018 in Reg. 533.1.2.3 says that cartridge fuses are preferred to semi-enclosed fuses. I saw a promotional film once, made by a fuse manufacturer, extolling the virtues of cartridge fuses. The presenter said that the cartridge fuse is reliable, and when a new one is fitted it is totally unused and fully functional, unlike perhaps M.C.B.s where internal wear may occur with much use. Of course if the 8.5kW  (35.4 Amps) shower is rated at 240 Volts, its current will increase with a Voltage rise to say 250 Volts.


Z.