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Images. A standard UK three-pin plug. A standard UK three-pin plug. A 3-core and a 2-core wire. Both contain a live and a neutral wire, but only the 3-core has an earth wire. Fuses usually come as replaceable cartridges. The wire inside the fuse heats up and melts if there is too much current.
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A 3-core and a 2-core wire. Both contain a live and a neutral wire, but only the 3-core has an earth wire.
Fuses usually come as replaceable cartridges. The wire inside the fuse heats up and melts if there is too much current.
Some appliances are double-insulated, as indicated by the square symbol in the photo. They do not need an earth wire as the case cannot become live.