Nartel® BS1362 Fuse Cartridge 13 amp for UK plugs (Pack of 10)

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Where I'm getting turned around. The current (I2) causing effective operation of the protective device does not exceed 1.45 times the lowest of the current carrying capacities (Iz) of the conductors of the circuit.

These fuses are “F” speed rated, which is short for Fast Acting. This is also known as fast blow and is popular in general purpose applications. They are designed not to handle current spikes over the rated current. The car draws 250 to 300A to spin the starter. How long can I crank the engine while my son and the nervous alarm man hold the 2.5mm onto the 2 batteries without burning either of them ?The rated current or current setting of the protective device (In) does not exceed the lowest of the current carrying (Iz) of any of the conductors of the circuit, and The non-fusing current, the current that the fuse is capable of carrying, is specified as 1.6 times the rated current (I nf = 1.6 I n). The fuse must be capable of carrying the non-fusing current for at least 30 minutes. So a 13A fuse must be capable of maintaining a current of 20.8A for at least 30 minutes without blowing. Fusing Current The outcome of all this is to not worry about these minor domestic overload problems, as one can see from the normal use one sees, they rarely cause any trouble at all. Loose connections are the cause of problems, not overload of cables.

I appreciate that there will be manufacturers tolerances both for the device and the cable (which could go both ways) and that there is undoubtedly going to be some headroom in the cable. I've seen a plumber leave a 9.0kW electric boiler on a bit of 1.5 flex before and yeah (prior to me fixing it) it was pretty hot after a few hours but it hadn't melted! Is the answer just that we're only talking about an extra amp in the example and whilst it may get a bit hotter than would be ideal this isn't the end of the world or are we into the realms of trying to work out how much heat is being dissipated during the fault by the flex as it is going to be happening over quite a prolonged timeframe? Unfortunately this proves how difficult it is to tell the difference between counterfeit and genuine BS1362 fuses. The ASTA, BSI or Nemko approved symbols do not prove authenticity. HBC stands for high breaking current and refers to the maximum current that the fuse can handle without breaking. It is also known as HRC (High Rupturing Capacity). Well a 13 A fuse will carry 13A all day, and may not blow in any sensible time even at 20-25A, depending on manufacturing tolerances and environmental temperatures.a-one and a-two and a-three.” for cranking time, And relax and cool for 15 -20 seconds before retry so average current is perhaps 20-30A.