Trystan Casey
Fuses are protective devices that cut off the current when a circuit is overloaded or faulty, reducing the risk of damage from electrical surges. Knowing how to change a fuse can save you time and frustration during a power outage. In this guide, we will walk you through the process of changing a fuse safely and restoring electricity to your home. We will also discuss some common reasons for blown fuses and how to identify if you have an overloaded system. Remember, dealing with electricity requires a careful and knowledgeable approach, so if you are ever unsure, don't hesitate to call a qualified electrician.
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What You'll Learn
Locate the fuse box
If you are unsure where to find your fuse box, your first job should be to track down its location and ensure easy access. Typically, a fuse box is a metal box with round plugs and glass circles in the centre. It is usually flush with the wall.
Fuse boxes are generally located in the basement, garage, attic, or behind a small metal door on an interior wall. They can also be found in closets, hallways, crawl spaces, utility rooms, or laundry rooms. If you are still unable to locate the fuse box, check where the power connects to your house from outside or near your meter box. You can also ask your neighbours where their fuse boxes are, especially if your houses were built in the same era.
If you are unable to locate the fuse box, consider calling an electrician. They can help you find it and also advise on any necessary upgrades to your electrical panel system.
Once you have located the fuse box, open the door. If you see rows of switches, you have a circuit breaker box. If you see round fuses screwed into sockets, you have a fuse box.
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Identify the blown fuse
Fuses are essential safety devices that protect your wiring and appliances from electrical overloading. A blown fuse can be identified by a few telltale signs. Firstly, if you experience a sudden loss of power in certain areas of your home, it could be due to a blown fuse. Check if some lights or outlets aren't working, and if you notice a burning smell or hear a popping sound, it's likely that a fuse has blown.
Secondly, locate your fuse box, usually found in the basement, garage, or a closet near the electric meter. Inspect the glass containers that hold the fuses. A blown fuse will often have a broken filament and a black or grey discoloration around it. You may also see a gap in the wire or a metallic smear on the inside of the glass container.
Thirdly, identify the specific circuit affected by the blown fuse. Go around your house, turning lights on and off until you find the location where the power is not working. Turn off the lights and unplug all electrical devices in that area.
Finally, if you're comfortable with electrical work, you can use a multimeter to test for a blown fuse. This device measures voltage, electrical flow, and resistance. Alternatively, contact a licensed electrician to help identify and fix the issue.
Remember, replacing a blown fuse is generally a simple process, but using the wrong type or size of fuse can create a fire hazard. Always use the same type and amperage rating as the blown fuse.
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Turn off the power
Before attempting any electrical work, it is important to prioritise safety. Fuses are protective devices that cut off the current if a circuit overloads or there is a fault. A blown fuse will have a broken filament or a visibly burned appearance. If you experience blown fuses often, you might have an overloaded system, so it is important to ask a qualified electrician about upgrading your fuse box or consumer unit to handle your energy needs.
To begin changing an electrical fuse wall unit, start by turning off all electrical devices in the affected area of your home. This includes turning light switches to the off position, even if the lights are already out. This reduces the risk of overloading the fuse again.
Next, turn off the power at the fuse box. This will completely cut off the power to all fuses, so expect your home to go dark. The fuse box is usually found in the basement, utility room, or near the main electrical panel and the electricity meter. Ensure you have proper lighting and clear access to the fuse box. Locate the main power switch or breaker and flip the switch or trip the breaker to the "Off" position to cut off the power supply.
Once the power is off, you can inspect the fuses in the fuse box to identify the one that has blown. If your fuse box is labelled, you may be able to narrow down the fuses based on what part of your home lost power. A blown fuse will have a discoloured appearance or a melted piece of metal.
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Remove the blown fuse
Before removing a blown fuse, it is important to ensure that the plug is disconnected from the mains. Fuses are delicate components, so caution must be exercised when removing them.
The first step is to locate the fuse box, which is likely to be near your electricity meter. The fuse box will contain labelled switches, such as "kitchen" or "living room". Once you have located the fuse box, identify the fuse that needs to be replaced. A blown fuse can usually be identified by a broken or melted filament within the glass tube or discolouration.
After identifying the blown fuse, it is time to remove it. Each fuse should have a screw-threaded base or a holder. Carefully unscrew or remove the fuse, being careful not to use excessive force. Once the blown fuse has been removed, replace it with a new fuse of the exact same amp rating. Using a higher amperage is a safety hazard and can lead to circuit overload and fire risk.
If you experience frequent blown fuses, you may have an overloaded system. Consult a qualified electrician about upgrading your fuse box or consumer unit to meet your energy needs.
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Insert a new fuse
Fuses are protective devices that shield electrical systems from dangerous power surges and excessive temperatures. When subjected to extreme conditions, a fuse will burn out, and unlike a circuit breaker, it cannot be reset and must be replaced.
Before inserting a new fuse, you must identify the type of plug you have. A moulded plug will usually have a pop-out fuse holder between the pins, whereas a standard plastic plug typically has the fuse internally mounted and needs to be opened up. A moulded plug is generally very easy to replace the fuse on. Pop out the fuse holder using a small flat-bladed screwdriver or a similar tool, then seat a new fuse of the same type and rating, and reinstate the holder.
To replace a main fuse, first locate the fuse box, which is commonly found in closets, hallways, mudrooms, crawl spaces, basements, utility rooms, or laundry rooms. Once located, grasp the metal or plastic T-shaped handle of the fuse block and pull it out firmly. Set the block upside down on a table to expose the fuses on the back. Remove the cartridge fuses from the block and test them with an ohmmeter or continuity tester. Put the new cartridge fuse into the fuse block, ensuring that the two end contacts touch the metal conductors on the fuse block. Slide the fuse block back into the fuse box and test the power by turning on a device connected to the circuit.
It is important to note that fuses for 3-pin plugs may have different ratings, and each fuse should be identifiable by colour and marked with its rating. When replacing a fuse, it should always be a like-for-like replacement that matches the specification of the equipment. Replacing a fuse with a larger one is dangerous as it may cause a fire or electrocution.
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Frequently asked questions
A blown fuse will have a broken filament or a visibly burned appearance. You may also be able to identify a blown fuse by locating a discoloured fuse or a melted piece of metal.
Ensure that the power supply is cut off by locating the main power switch or breaker and flipping the switch to the "Off" position.
It is important to determine the appropriate type and rating of fuse to replace the blown one. Match the amperage and voltage ratings of the blown fuse precisely.
Once the replacement fuse is properly inserted, restore power by flipping the main power switch or resetting the breaker to the "On" position.
If fuses are blowing regularly, you may have an overloaded system. Consult a qualified electrician about upgrading your fuse box or consumer unit to handle your energy needs.
