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Because firstly, the fuse blew for a reason and it should not be replaced until the fault has been repaired, and secondly, if it would have blown again, the coin or nail would not work the same way a fuse would; the nail/coin/whatever would not burn out and the entire system is unprotected from a surge.

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Q: Why should you never replace a fuse with a solid piece of metal such as a coin or nail?
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