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A few months ago I found myself with mapj1 junior in the car at a remote place with a defective battery. The jump leads were in Mrs mapj1s car at the time. Then it began to rain. That sort of day.
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 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. 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! 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.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 operating characteristics of a device protecting a conductor against overload shall satisfy the following conditions:
If you are purchasing fuses online, we recommend only using a reputable supplier such as RS Components or Farnell. Both of these companies are able to provide data sheets and compliance documentation for the products they sell. Identifying counterfeit electrical equipment is becoming an important part of the inspection process and is something that we cover in our courses. Counterfeit BS1362 Fuse Testing 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. Then I agree with the several mins figure for a 40 degree rise. The conductor only version is the basis of our old friend the adiabatic calculation, where it is so fast that the heat does not have time to stabilise to a uniform temp throughout the PVC, so we pretend that no heat is lost to the insulation at all, as the temperature rise calculated that way is always a safe over estimate, so we safely under estimate the let-through energy the cable can stand. is 0.71 correct for the fuse type, I see some records point to 0.87 for non 1.45 fuse factor devices)NOTE 2: Protection in accordance with this regulation may not provide protection in all cases, for example, where sustained The wire inside a fuse heats up when a current passes through it. The more current that passes, the hotter the wire will get. If the current is high enough, the wire will melt and cut the power to the appliance. The rated current of the fuse, in this case 13A, is the current that it can safely pass whilst maintaining a low enough temperature not to overheat the plug. BS 1362, the British Standard for the fuses used in plugs, specifies a maximum power dissipation of one watt when carrying the rated current.
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