All modern wiring systems use fused plugs with flat pins. If you find any round pin sockets or equipment with round pin plugs, do not use until they have been thoroughly checked by an electrician, as the wiring may be old. Make sure that the plugs bear the stamp of the Association of Short Circuit Testing Authorities (ASTA). This ensures that the design and manufacture of the plug is to an approved standard. You will find it on fuses as well.

Wiring a plug is quite straightforward. All you need is a small screwdriver and something to cut the wires to length and to strip away unwanted insulation. A proper wire stripper and cutter is best but you can always use a sharp knife. If you are in any doubt whatsoever about wiring a plug or replacing a fuse, get expert advice. See Appendix 8.

To select the correct size of fuse, you must know the power requirements of the appliance that is usually marked on the rating plate. Some appliances will need a higher size fuse than their wattage indicates so always follow the manufacturers instructions. A 3 Amp fuse is suitable for most appliances up to 720 Watts and a 13 Amp fuse is suitable for appliances rated at over 720 Watts.

Remember that fuses are primarily there to protect the equipment against overload and consequent damage by fire. They are not there to protect you and other methods are necessary to protect from electric shock.

Cables must be of sufficient rating to carry the current, which will flow through them in both normal and abnormal conditions. They must be of the type where the functional insulated leads are further protected by an insulating sheath. Leads carrying power from one piece of equipment to another must be fitted so that connecting plugs or sockets cannot leave bare live pins on disconnection. The pins must always be on the equipment, which is being supplied. Extension cables should only be used if absolutely necessary. It is essential that the adaptors on any extension cable be wired in a way that will not lead to bare live pins on the plug. The plug must be wired to the equipment, which is being supplied by the extension. It is also essential to ensure that the live and neutral wires are not interchanged at the socket plug adaptor and that a good earth connection is maintained. Adaptors should not be used unless absolutely necessary. In no case should more than on adaptor be used for any socket.