How to Change a Fuse in a Breaker Box

Every homeowner should know how to change a fuse in a breaker box. Not only is it an easy task--saving you from having to call an expensive electrician--but it helps keep your home safe from power surges and shorts. The process takes about 10 minutes and can be accomplished with just a few common tools. Safety is key. As long are you're protected from unexpected electrical shocks, you should be able to change a fuse as painlessly as changing a light bulb.

Things You'll Need

• Replacement fuse Screwdriver Rubber mat Voltmeter

Instructions

1. Place a rubber mat on the floor in front of the breaker box. Stand on it at all times while you are working. If you don't have a rubber mat, then wear shoes with rubber soles.

2. Open the circuit box and turn the main switch, shutting off electrical power to your house. Then find the faulty fuse and turn it to the "off" position as well.

3. Remove the metal frame around the fuses with a screwdriver and set it aside.

4. Touch one prong of a voltmeter to the "hot" terminal on the faulty fuse. Touch the other prong to the ground terminal, which should be located in a row or along a bar to the left or right of the fuses. The voltmeter should not light up, meaning that there's no electricity in the wiring.

5. Unscrew the broken fuse from the mounting and carefully pull it free. For newer breaker boxes, you won't need to unscrew it--it just pops right off.

6. Loosen the terminal screw on the old fuse and carefully pull the wire or wires free. Keep track of which wire goes where.

7. Turn the switch on the new fuse to the "off" position. Insert the wire or wires into the new fuse in the exact same terminal as the old fuse. Tighten the terminal with a screwdriver.

8. Pop or screw the new fuse into the same position as the old one, then check to make sure it is secure.

9. Turn the main power switch on, then turn the new fuse on. Place the prongs of the voltmeter against the hot terminal and the ground terminal as per Step 4. The voltmeter should light up.

10. Replace the metal panel and screw it back into position with a screwdriver, then close the breaker box.

Tips & Warnings

• Always compare your new fuse with the amperage of your old one. The number of amps (usually 15, 20 or 30) needs to be a precise match.

• Make sure the area around the breaker box is completely dry and contains no puddles or standing water. If it does, mop them up and dry the area completely before you start work.