Beatrice Lang
Replacing a fuse in an electrical plug is a simple task that can save you from paying an electrician. However, it is very easy to make a mistake, which can lead to dangerous situations, so caution is advised. Before you start, make sure that the plug is disconnected from the mains and identify the type of plug you are working with. In the UK, plugs tend to come in two forms: standard plastic plug or moulded plug. You will also need to ensure you are wearing the correct protective gear, such as rubber gloves and rubber-soled shoes, and that you have the right tools for the job, such as a flat-headed screwdriver.
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What You'll Learn
Disconnect the plug from the mains
Before you start changing the fuse, make sure that the plug is disconnected from the mains. This is a crucial safety step to avoid electric shocks and prevent potential fires.
To do this, first, switch off the electrical device. Then, physically unplug the device from the wall socket. Ensure that the plug is facing upwards, so you can see the metal pins.
Now, you can identify the type of plug you are working with. In the UK, plugs tend to come in two forms: standard plastic plugs or moulded plugs. A standard plastic plug will have the fuse internally mounted and will need to be opened up. A moulded plug usually has a pop-out fuse holder between the pins, which can be released with a small flat-headed screwdriver.
Once you have identified the type of plug and ensured it is disconnected from the mains, you can proceed to change the fuse.
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Identify the type of plug
Electrical plugs, also known as power plugs, are used to connect devices to a power supply. They are typically composed of prongs or pins housed within a plastic frame or casing. The first step in identifying the type of electrical plug is determining whether it is a plug or a receptacle (also known as an outlet). If there is space for something to fit into it, it is generally a receptacle. Plugs, on the other hand, usually have front-facing pins or sockets and are harder to insert something into.
Once you have identified whether you are dealing with a plug or a receptacle, the next step is to identify the type of plug. There are several factors to consider when identifying the type of electrical plug:
- Shape and Colour: Electrical connectors come in various shapes and sizes, such as triangles, rectangles, flats, and squares. Pay attention to the colour, although this may not always be definitive.
- Number of Pins: The number of pins in the connector is a crucial characteristic. Connectors can have different pin configurations, ranging from just three in a row to multiple rows and columns. The number of holes at the back of the plug determines the correct connector, regardless of the number of wires used.
- Keyways: If you encounter two connectors that are similar in shape, colour, and pin count, look closely at the keyways. These are the little bumps at the front of the connector that align with the sensor. Even slight variations in the keyways can help distinguish between similar connectors.
- Voltage and Current Rating: Electrical plugs differ in voltage and current specifications, which are often dictated by the country of use. For example, NEMA Type A plugs have a current rating of 15A and a voltage rating of 125V.
- Grounded or Ungrounded: Modern installations require three-pronged grounded outlets to ensure optimal electrical safety. Older homes may have ungrounded receptacles that are not compatible with modern grounded plugs.
- Standards and Specifications: Electrical plugs are standardised by organisations such as the National Electrical Manufacturers Association (NEMA) in North and Central America. NEMA plugs are designated by type, such as Type A (ungrounded with two flat parallel prongs) and Type B.
By considering these factors, you can identify the type of electrical plug and ensure compatibility and safety in your electrical installations.
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Remove the old fuse
Before you start changing the fuse, make sure the plug is disconnected from the mains. It's important to ensure your safety by preventing potential fires or electric shocks.
Now, let's begin the process of removing the old fuse:
First, identify the type of plug you have. In the UK, plugs are typically either standard plastic plugs or moulded plugs. Standard plastic plugs usually have the fuse internally mounted, while moulded plugs often have a pop-out fuse holder between the pins.
For a standard plastic plug, you will need a screwdriver, usually a flat-headed one, but this may vary depending on the specific screws in your plug. Loosen the screws in an anti-clockwise direction. You may not need to completely remove all the screws, as the back of the plug should come away after a few turns. Keep the screws in a safe place for later.
Once the back of the plug is open, you will see the fuse within two metal holders. Carefully, prise out the old fuse. Don't worry if one of the pins comes out with the fuse, as this can be easily slid back through the case once the fuse is removed.
If you have a moulded plug, use a small flat-bladed screwdriver to pop out the fuse holder. Then, simply remove the old fuse from the holder.
Remember, it is important to replace the old fuse with a new one of the same type and rating. Domestic fuses usually have the same physical size but different ratings, which are indicated by colour. It can be dangerous to change the fuse for one with a different rating, as this can cause the fuse to blow or damage the equipment.
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Insert a new, correctly-rated fuse
When inserting a new fuse, it is important to ensure that it is the correct type. Fuses with different amp ratings are denoted by specific colours: red for 3A, black for 5A, and brown for 13A. For appliances up to 700 watts (such as lamps, mixers, and blenders), a 3A fuse is required. Appliances over 700 watts (like microwaves, kettles, toasters, and irons) need a 13A fuse. However, always refer to the manufacturer's instructions for specific appliance requirements.
It is crucial to replace the fuse with one of the same rating, as fuses are chosen to ensure the product they supply does not draw more current than it should. Using a larger fuse can be dangerous, potentially causing a fire or electrocution.
Once you have the correct new fuse, simply clip it into place. The fuse can go in either way around. After inserting the new fuse, reattach the fuse cover or the plug's cover. If you had to unscrew the cover, make sure to screw it back securely.
Now, plug in the appliance and test it to ensure it is functioning properly. If the new fuse blows immediately, it is a sign that there may be a deeper electrical problem. In such cases, it is recommended to seek the assistance of a professional electrician.
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Reattach the plug's cover
Reattaching the plug's cover is a simple process, but it is important to be cautious and ensure that everything is secure. If you have a separate fuse cover, gently pop it back into place using your hands or a small flat-headed screwdriver. If you have a standard plastic plug, you will need to screw the cover back on. Ensure that the cover is properly aligned and fits securely all the way around. Tighten the screw(s) in a clockwise direction, using a screwdriver that fits the screws on your plug precisely. Usually, this will be a flat-headed screwdriver, but it may depend on the type of plug you have.
Once the cover is in place, check that it is secure by trying to move the metal pins that go into the wall socket. If there is no movement, you have successfully reattached the cover. You can now plug in the appliance and test it to ensure it is working correctly.
If the fuse blows again, there may be an electrical fault. In this case, it is recommended to consult an electrician to carry out an electrical safety inspection.
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Frequently asked questions
If an appliance has stopped working, it could be due to a blown fuse.
Ensure all electrical devices are switched off and unplugged. It is also recommended to wear protective gear, such as rubber gloves and rubber-soled shoes, to avoid electric shocks and potential fires.
You will typically need a screwdriver. The type of screwdriver depends on your plug, but it is usually a small flat-headed or flat-bladed screwdriver.
Fuses come in different ratings, which correspond to the amount of current they can safely handle. The rating is usually denoted by a specific colour. Always replace the fuse with a like-for-like fuse or ensure you understand why a different rating is required.
Reattach the fuse cover or the plug's cover. Ensure that it is screwed on securely. Plug in the appliance and test it to ensure it is working properly. If the new fuse blows immediately, consult an electrician as there may be an electrical fault.
