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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.)? So there we are, a 2.5 sqmm cable loaded at 20 A will take over 45 minutes to get up to 70 deg C from 20 deg C enclosed in conduit in an insulated wall. Any smaller loading or less lagging and it will never get there because the heat generated in the conductors will always be less than the available heat loss. Simon's response correlates with what my understanding is telling me - which seems at odds with the pretty confident guidance/statements in the Beama guide.
The fuse wire is a flat tape rather than round wire. In comparison with a 13A fuse wire, it’s considerable larger. 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. NOTE 2: Protection in accordance with this regulation may not provide protection in all cases, for example, where sustained As far as I understand it the fusing factor of a 1362 fuse BS 1362 fuse is 1.9 (0.763) although in fairness I have seen lower fusing factors quoted (1.66?? which removes the particular problem I am wrestling with.)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 genuine 13A Bussmann fuse also has a solder bead on the fuse wire which is missing on the fake.
The length of the fuse is too short. A plug top fuse should have a length of between 25.0 - 26.2 mm. The diameter of the of the end cap measures 6.05mm and does not meet BS 1362 either. It should be 6.25 - 6.5 mmBreaking the fuse open confirms that these fuses are counterfeit. There is no sand filling. The quartz sand inside a genuine BS1362 is designed to control the rupture of the fuse wire within the ceramic body. 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. 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.
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