The genuine 13A Bussmann fuse also has a solder bead on the fuse wire which is missing on the fake. Part 2: Overcurrent: A current exceeding the rated value. For conductors the rated value is the current carrying capacity. 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.

ii) the rated current or current setting of the protective device (In) does not exceed the lowest of the currentcarrying Look at these curves and look at the ‘all blow’ right hand curve, vs the left hand ‘never blow’ limit for 13 and 3A fuses. In the spirit of learning from my betters I will lay myself open to ridicule! I'm faintly terrified at having my life changed though! ? This range of fuses from Eaton Bussmann are fast-acting with high rupture capacity. They are suitable for various different uses, providing reliable performance and cost-effective circuit protection. They are ideal for use in plugs to protect cables from melting or catching fire if they are overloaded. The manufacturing standard of these fuses is particularly poor. The fuse wire is simply trapped between the end cap and body. A genuine BS1362 fuse has the internal wire connected to an eyelet inside the centre of the cap.Now I did not quite use Chris's figure of 3 mins at 20 A, but if I had it would have scaled to 3mins/100 at 200A, or about 2 seconds for a 40 degree rise. I had a more optimistic figure, allowing a bit for the PVC, and as I did not have the regs with me, so used a pidooma figure from memory. I've been cogitating on the fusing factor of 1362 fuses (specifically 13A fuses) and how this correlates with the protection of a 1.5mm2 flexible cable. As ever I am hoping you can shine a light! I find it quite common to see 13A 1362 fuses inline on 32A cooker circuits protecting 1.5mm2 flexes to ovens. Is this deemed acceptable even though the oven isn't strictly speaking a fixed load (fan motor etc.)?

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. iii) the current (I2) causing effective operation of the protective device does not exceed 1.45 times the lowest of The operating characteristics of a device protecting a conductor against overload shall satisfy the following conditions:If too large a current flows through a lead it may overheat or catch fire, making the main purpose of a domestic plug fuse to prevent fires due to large currents.

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 Is there another factor at play here which I am missing? Or do I just have the wrong fusing factor! The dimensions meet the BS1362 requirements and it also contains a sand filling. If it were not for the incorrect licence numbers being printed on the fuse, there would be no reason to suspect that these were counterfeit. Reference 4F3A a 1.5mm2 single phase AC flexible cable has a tabulated current carrying capacity of 16amps. 16x0.763 = 12.208 amps which is obviously less than the 13 amp rating of the fuse.These domestic plug fuses are ideal for protecting the flexible lead between theplugand appliances to prevent fires due to large currents. In reality only AWE or CERN will install a cable in vacuum like that, and of course any real cable will heat quite a lot more slowly.