How to Replace Fuses at Home

Fuse Box

Fuses are a type of circuit protector in older homes (circuit breakers are used in newer homes). They are housed in a box, usually located in the basement or utility area.
A fuse is designed to handle a specified amount of amperage. When appliances draw more amperage than the circuit can handle, excess heat builds up, causing the fuse to self-destruct (blow) in order to protect the wiring. Power running through that circuit is immediately cut. Multiple temporary overages can also weaken the fuse over time, causing it to blow without exceeding its amperage rating.

Things You'll Need

• Replacement fuses
• Flashlight

Instructions

How to Replace Fuses at Home

1. Unplug all of the appliances and devices from the affected circuit before installing a new fuse (the energy required to restart them could damage the electrical equipment or cause another blown fuse). While working with electricity, always stand on dry ground, and do not touch anything wet or metallic.

2. Locate the main power lever on the fuse box. Pull it down to the OFF position to cut off the main power to the house.

3. Locate the blown fuse---it will be black in the middle. Turn the fuse counterclockwise to loosen, and remove it from its socket. If there are signs of rust or other damage to the fuse or socket, leave the main power switch off, and call a qualified electrician.

4. 

   Screw the new fuse into the socket, touching only the outside rim, while the main power switch is still in the OFF position. Turn clockwise to tighten.

5. Turn the main power switch to the ON position to restore power. Again, do not touch anything wet or metallic.

6. Turn on the electrical appliances in the affected circuit one at a time. Set to the lowest setting if the item offers more than one setting. If the fuse blows again, turn the equipment off and call a qualified electrician.

Tips & Warnings

• The amperage of the new fuse should match that of the old fuse. Screw in the fuse until snug---do not overtighten.

• Always stand on dry ground, and do not touch anything wet or metallic while working with electricity. The fuse rating should exceed the amperage demands of the appliances it protects. However, do not use a fuse with a higher rating than the wiring can accommodate.

Resources

• Electrical Safety Checklist
• Electric Fuse Definition