Trystan Casey
A blown electrical fuse can be caused by an overloaded circuit, a faulty appliance, or a short circuit. It is important to identify the cause of the blown fuse before attempting to fix it. To do this, you should check for warning signs such as a burning smell, scorch marks, or repeated blown fuses. Once you have identified the cause, you can take the necessary steps to fix the issue. If you are uncomfortable working with electricity or if fuses continue to blow, it is recommended to call a licensed electrician for help. However, with the right precautions and replacement fuses, you can safely replace a blown fuse yourself.
| Characteristics | Values |
|---|---|
| When to fix a blown electrical fuse | When electricity takes the wrong path, causing a surge. Warning signs include a burning smell, scorch marks, or repeated blown fuses. |
| How to fix a blown electrical fuse | 1. Turn off and unplug all appliances and devices in the affected area. 2. Wear rubber-soled shoes and insulated gloves. 3. Remove the main fuse block before touching any individual fuses. 4. Identify the blown fuse in the fuse box (it will be melted or cloudy). 5. Replace it with a new fuse of the same size, type, rating, and amperage. 6. Screw the new fuse into the same electrical panel socket. 7. Restore the main power to the electrical panel. |
| How to prevent a blown electrical fuse | 1. Routinely check your electrical panel for any signs of damage or wear and tear. 2. Avoid overloading outlets with too many devices. 3. Unplug devices that are not in use. 4. Replace electrical cords that are frayed or cracked. 5. Use surge protectors to protect your appliances and devices from power surges. |
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What You'll Learn
Identify the cause: overloaded circuits, faulty appliances, or short circuits
Blown electrical fuses are a common occurrence and can be caused by overloaded circuits, faulty appliances, or short circuits. Here's how to identify the root cause:
Overloaded Circuits
Overloaded circuits are one of the most common causes of blown fuses. This happens when multiple high-wattage appliances are plugged into a single circuit, drawing more power than the circuit can handle. The power demand in modern households has increased significantly, and older fuse boxes may struggle to keep up. If you frequently experience blown fuses, your electrical use may exceed your fuse panel's capacity.
To identify if an overloaded circuit is the issue, examine your power usage habits. Are multiple high-energy appliances plugged into the same circuit? Are you running several electrical appliances simultaneously when the fuse blows? If so, reducing the load on that circuit by distributing power usage across different circuits or unplugging appliances not in use may help prevent future blown fuses.
Faulty Appliances
Faulty, degraded, or damaged wiring in appliances can also cause blown fuses. This is more common in older homes with outdated wiring. Warning signs of faulty wiring include burning smells, flickering or buzzing lights, smoke, scorch marks, or warm outlets. If you suspect faulty wiring, contact a qualified electrician to inspect and address the issue.
Short Circuits
Short circuits occur when the electric current deviates from its intended path due to factors like poor insulation or circuit breaker resistance. This type of electrical fault can lead to a blown fuse. To identify a short circuit, observe if the issue occurs with a particular device or circuit. If a specific appliance consistently causes the fuse to blow, it may have a short circuit, and an electrician should assess it.
Other Potential Causes
In some cases, the cause of a blown fuse may be more complex. For example, older homes with large circuits may struggle to support high-amperage appliances like space heaters, leading to frequent trips. Additionally, power surges due to downed power lines, lightning strikes, or other electrical issues can blow a fuse. If you cannot identify the cause through basic troubleshooting, it is best to consult a qualified electrician for a thorough inspection.
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Locate the fuse box
Locating the fuse box is the first step in fixing a blown electrical fuse. Fuse boxes are typically found in older homes, while modern homes usually have circuit breakers. If you live in an older home, your fuse box is likely located in the garage, basement, or utility area. In some cases, it may also be found in the attic, storage room, laundry room, or hallway. Fuse boxes in older homes may even be located outdoors, possibly near the electric meter box. Large homes may have more than one fuse box.
If you're having trouble locating your fuse box, there are a few things you can try. First, if you had a home inspection performed before purchasing the property, refer to your inspection report, which may list the electrical panel location. You can also try asking the builder, if known, or a professional electrician can help you find the panel.
Once you've located your fuse box, it's important to keep the area clear and easily accessible. Avoid blocking it with boxes, shelves, or furniture. It's also a good idea to keep a battery-powered flashlight or lantern nearby so you can see what you're doing in the event of a power loss.
Identifying your fuse box is crucial for fixing a blown fuse. If you have a circuit breaker, you'll see a series of switches or levers. On the other hand, fuses are typically round and screw into sockets. Knowing what to look for will help you quickly identify and address any issues with your fuses.
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Identify the blown fuse
If a component in your vehicle stops working, the reason is most often a blown fuse due to an overabundance of electrical current. This could be everyday devices like a car stereo or interior lighting, or more advanced systems like safety features, driver assistance technologies, and passenger comfort amenities.
To identify a blown fuse in your car, turn off the vehicle and locate the main fuse box, usually located in the driver’s side footwell underneath the dashboard. There may also be a second fuse box under the hood. Consult your owner’s manual for the exact location of each. In most cases, a diagram inside the fuse box or in the owner's manual shows the position and name of each fuse. This helps you locate the fuse related to the failed component. Pay close attention to the diagram, as a typical vehicle may have over 30 fuses, and higher-end cars with more electronics may have two to three times that number.
Once you've identified the correct fuse, pull it out using fuse pullers or pliers, and visually inspect it. The blown fuse will be apparent because the wire element within will have melted or burned from the higher electrical current. The glass container on a blown fuse might be cloudy black or grey, or have metallic residue on the sides. If the glass container is cloudy, or the fuse is split, this is a sign that the fuse needs to be replaced.
You can also use diagnostic tools like a test light or a multimeter to identify a blown fuse without having to pull it out. A multimeter can be used to test for continuity. If there's 120 volts across a fuse while it is powered, then it's blown. If you remove it and test on the ohms range with the beeper and there's no continuity (no beep), it's blown.
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Remove the blown fuse
Before removing a blown fuse, it is important to take the necessary safety precautions. Turn off the lights and unplug appliances in the part of the house that has lost power. This will prevent overloading the new replacement fuse. Make sure to work in a dry environment, and wear rubber-soled shoes and insulated gloves. Some sources also recommend wearing safety glasses to protect your eyes from electrical sparks.
Next, locate your fuse box. This is usually located behind a small metal door or box, and can be found in the garage, attic, basement, storage room, laundry room, utility room, hallway, or outside near your electric meter box. If you cannot find it, refer to your home inspection report, which may list the electrical panel location.
Once you have located the fuse box, open the door and inspect each fuse to find the one that is blown. A blown fuse may be discoloured, cloudy, or have a melted or broken metal piece inside. If your fuses are not labelled, you can figure out which circuit is affected by turning lights on and off until you find the area without power.
Now you can remove the blown fuse. First, cut the power to your entire house by pulling out the handle on the main fuse block. Then, carefully unscrew the blown fuse, avoiding contact with its metal threads to prevent shocks or burns.
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Install the new fuse
Before installing a new fuse, it is important to take the necessary safety precautions. Turn off the lights and unplug appliances in the part of the house that has lost power. This will ensure that you do not overload the new replacement fuse. It is also recommended to wear gloves and rubber-soled shoes, and remove any jewellery when working with the electrical panel.
Now, to install the new fuse:
- Ensure that you have the correct replacement fuse. It is important to use a fuse of the same size, type, rating, and amperage as the one that blew. Using a fuse with a higher amperage can be dangerous and cause damage to your electrical panel wiring.
- If you are dealing with a plug fuse, twist it counterclockwise to remove it. For a cartridge fuse, use a fuse puller.
- Screw or push the new fuse into the electrical panel socket.
- Slide the main fuse block back in and press firmly.
- Restore the main power to the electrical panel.
If the fuse blows again, it is recommended to call a qualified electrician to perform an inspection.
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Frequently asked questions
Usually, the power goes out in a certain area of your home rather than the entire house. You may also notice a burning smell, scorch marks, or repeated blown fuses. A blown fuse may be discoloured, cloudy, or have a melted or broken metal piece inside.
First, turn off and unplug all appliances and devices in the affected area. Put on safety gear, including rubber-soled shoes and insulated gloves. Locate your fuse box and find the blown fuse. Unscrew and remove the blown fuse, and replace it with a new fuse of the same size, type, rating, and amperage. Screw the new fuse into the electrical panel socket and restore the main power.
Routinely check your electrical panel for any signs of damage or wear and tear. Avoid overloading outlets with too many devices and unplug devices that you aren't using. Replace electrical cords that are frayed or cracked, and use surge protectors to protect your appliances and devices from power surges.
