Fatal Fuse Folly
If you live in an older home that has fuses rather than breaker switches in the main electrical panel, NEVER replace one fuse with another that carries a higher amp rating. Yes, a 20-amp fuse will work with a 15-amp circuit. And it may save you the frustration of replacing fuses on a circuit that over-loads frequently. But it also allows more power flow than the circuit was designed to handle. This mistake has led to thousands of home fires, even deaths.