How to do DIY


A fuse is a circuit protection device, the purpose of the fuse is to protect the cables and flexible cables supplying any appliances or electrical devices.

In the event of an appliance or electrical device developing a fault, the fuse is designed to rupture (blow) before the cables or flexible cables suffer any damage due to overheating.

Care needs to be taken to ensure appliances and electrical devices are protected with the correct size fuse.


New appliances have to be supplied with a plug that is fused in accordance with manufacturers' instructions.

Always follow manufacturers' recommendations for fuses, or seek expert advice.

Check older appliances such as electric blankets and Christmas tree lights

If a fuse blows for no obvious reason or an appliance is not working properly, switch off the appliance at the socket and unplug it before trying to find out why. If the fault can't be found or you are uncertain how to find the fault, get expert advice.

The same principles apply to fuse boxes or circuit breakers - always switch off at the mains before you investigate and remember to replace the cover before switching back on.

If you need to change a mains fuse, check the correct rating for that circuit - the blown fuse might have been incorrect in the first place. Using a thicker fuse wire than the correct rating is dangerous.

In doubt? Call in a qualified electrician.

Main fuse box

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