Placing too many things on a single circuit. Because fuse boxes typically have fewer circuits, homeowners often end up plugging in too many electrical appliances to a single outlet. That leads to fuses that blow a lot, which can lead homeowners to replace that fuse with a figged amperage fuse.
Replacing a fuse with a bigger fuse, Example, If you replace a 15-amp fuse with a 20-amp fuse (or larger), your fuse may stop blowing. However, you’ll also create a massive fire hazard. The wires in that circuit are only rated for 15-amps, not 20!
Replacing the fuse with something metal. Some homeowners go a step further and insert a metal object (like a penny) where the blown fuse once was. Again, this eliminates blown fuses, but also completely removes the safety that fuses provide. Your wires could pull large amounts of electricity, overheat and therefore start a fire.