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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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  1. Images

  2. A standard UK three-pin plug

  3. A standard UK three-pin plug

  4. 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.

  5. Fuses usually come as replaceable cartridges. The wire inside the fuse heats up and melts if there is too much current.

  6. 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.

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