% of people told us that this article helped them. The blade fuse is a common type of automotive fuse that has come into use in the last 20-30 years. It won’t burn off … Never test a fuse on equipment that is still on. This article has 11 testimonials from our readers, earning it our reader-approved status. Cars and older homes that don’t use modern circuit breakers use fuses to prevent damage from electrical surges. Smaller and newer buildings have the cylindrical fuse which has some sensitive links at its ends, wrapped with copper or any other type of conducting material. Other components in your car or home involve complex wiring systems that run on for some length. CN Coterie specializes in full home renovation, electrical, plumbing, carpentry, cabinetry, furniture restoration, OATH/ECB (Office of Administrative Trials and Hearings/Environmental Control Board) violations removal, and DOB (Department of Buildings) violations removal. Get a voltage tester that’s rated for up to 500 volts. If a fuse blows does that mean there's problem with the amp? Look closely at each fuse. These fuses are used in fuse panels and disconnects for amperages over 30 amps. How To Test A Fuse Using A Multimeter? If the fuse has a broken or melted connector, it is blown. Turn the meter to ohms, then touch the positive and negative leads together and check the reading. It is easier to test fuses than it is to test other electrical equipment. It's big brother, the knife-blade cartridge fuse, is similarly shaped with blades on each end. Evaluating Electrical Loads So if you get 00.00 your fuse is good. A ceramic fuse, however, shows no damage upon visual inspection. L ocated inside or outside of your home is a fuse box that contains a fuse for each of your home's circuits. Testing fuses can be done using a multimeter, and doing so is both fast and easy to learn. When this happens, no current can flow, and the circuit is disconnected from the power supply. The rating of the fuse determines the maximum amount of amperage that could go through it, the resistance (ohms) do not matter as long as it's not OL. Next, put one lead on each end of the fuse and check the reading. How to Test Fuses Using a Multi-meter Plug Fuses. They come in 15, 20, and 30-amp sizes and are... Cartridge Fuses. Approved. Your home's electrical wiring must be protected from short circuits and circuit overloads. Attach the clip for the test light to any bare metal, and use the probe of the test light to touch each end of a fuse. Just as the wiring is sized specifically for the load it can handle without breaking down and heating up, so works the fuse. Manually test the breaker first. The Ferrule-type cartridge fuse is generally used for the main feeder and range protection. If you want to use the meter as an ammeter, keep reading! We can check the fuse visually to see if it's broken or we can do an electrical test on the fuse using a multimeter to see if it's good or blown. What do I do if the reading is 00.00 when I touch the leads to the ends of the fuse or together? Set the multimeter. Put on a pair of rubber-soled shoes and make sure the area around the circuit box is dry. How to Reset a Circuit Breaker. Open the box door and turn on the flashlight to inspect the fuses. Previously, most vehicles also contained small glass cartridge fuses. Last Updated: November 18, 2020 Step 1. Ricardo has over 10 years of electrical and construction experience and his partners have over 30 years of relevant experience. ", "Found out that the door was not closing properly, no electrical/electronic was burnt. This will measure the resistance of the fuse link, if intact. On the end cap of a blade fuse, you'll see two exposed areas of metal designed for testing. Thanks! "I had a storm that sent a power surge and knocked out both Samsung TVs. It is usually grey in color and mounted near the outdoor AC unit. If the fuse turns out to be good, you can use a circuit tester to trace the wiring path and find out what's gone wrong. The best way to test for a blown fuse is by using a voltmeter. By using The Spruce, you accept our, How to Troubleshoot and Fix Holiday Christmas Lights, How to Determine the Size of Your Main Electrical Service, 4 Reasons Why Circuit Breakers Trip and Fuses Blow, Using a Neon Circuit Tester to Check Receptacles for Proper Grounding, How Electrical Service Panels Have Evolved, How to Turn Off the Power at Your Home's Breaker Box or Fuse Box, Calculating Electrical Load Capacity for a Home. Open the fuse box and locate the offending fuse or fuses. If the circuit doesn’t blow, turn the lights back on and plug in appliances one by one to check for the overload or short circuit. If the translucent area is blackened, it is. They are made clear so that you can see if the wire remains intact. While resetting it, the tripped breaker clicks as you … Plug fuses control 120-volt circuits that normally feed lighting and receptacle loads throughout your home. Testing a Fuse With a Multimeter. Step 3: If the wire is broken, replace it with fuse wire of the same amp rating. If the fuse is blown, the meter will not read anything at all, or the meter may say “Open Loop” or "OL." Remove the Plug Fuse. CN Coterie specializes in full home renovation, electrical, plumbing, carpentry, cabinetry, furniture restoration, OATH/ECB (Office of Administrative Trials and Hearings/Environmental Control Board) violations removal, and DOB (Department of Buildings) violations removal. With the ignition switch in the ON position, touch or clamp the black test lead to a good known ground. The Edison-type base has an advantage over the older style. This is because the blown fuse allows there to be a voltage differential between the two sides. Visual Test of a Fuse. Introducing "One Thing": A New Video Series. Plug fuses have a metal alloy ribbon inside that carries the current of the circuit. If the positive path is intact, you can also use the test light to check the grounding points of the circuit. They come in 15, 20, and 30-amp sizes and are screwed into the electrical panel. The rating ensures that the current can pass through the wiring safely. If you get no reading or “OL”, then the fuse has blown. This article was co-authored by Ricardo Mitchell. If a fuse is rated at .5 and the meter reads .3, is this a bad fuse? ", "What volt meter setting to touch both leads was helpful.". Understand fuses. When a fuse is broken, what does it read on a multimeter? Cartridge fuses are cylindrical and have the contact points at either end. Next, touch one lead to the center point of the fuse, and touch the other lead to the metal threads on the side of the fuse. Step 5: If a fuse continues to blow after it has been re-­wired, check for faulty appliances by unplugged all appliances and plugging them in one by one after replacing the fuse. If the fuse can be removed from the circuit, then the easiest way to determine if it has blown is a continuity test. Using a test light to check a fuse that appears not to work but changing the connection to a positive source touching the same fuse and the test light goes on. If it is, then the fuse works properly. Twist them counterclockwise to remove them from the socket. Plug fuses come in a screw-type configuration. The cartridge fuse is a cylindrical fuse that has been common in a wide variety of devices for many years, from homes to small electronic devices. What is the acceptable level of ohms for a fuse to be considered good? This article was co-authored by Ricardo Mitchell. Sometimes these fuses require testing to check that they are still in good working order. Ricardo has over 10 years of electrical and construction experience and his partners have over 30 years of relevant experience. A fuse incorporates a fuse link that has a specific amperage rating, usually 15, 20, or  30 amps. Fuses are really just wires that are designed not to last, but their purpose is to prevent damage to more valuable electrical equipment or prevent fires (especially in homes) caused by power surges. Timothy Thiele is an electrician who advises residential DIYers on how to make home installation projects safe and easy. Ricardo Mitchell is the CEO of CN Coterie, a fully licensed and insured Lead EPA (Environmental Protection Agency) Certified construction company located in Manhattan, New York. To verify that you have a blown fuse on hand, the first step is to locate the disconnect box. Touch the metal caps at each end of the fuse with the metal tips of the testing leads. If the reading is close to the one you got when you touched the positive and negative leads, the fuse is fine. There is no polarity so you can use any lead for either fuse cap. Never replace a blown or suspect fuse with one of a higher rating. By setting the selector switch to ohms and setting it on a lower range, you can test the resistance between the two points of the fuse. If the fuse is bad, only one side will illuminate the test light. Turn off the main power switch to disconnect power to the fuse box. Instructions Identify the Plug Fuse. The older type fuses have a brass screw thread on the side and a center contact point. A multimeter has a positive and negative lead. This protects against short circuits and overloads that may damage electrical wiring and cause house fires. Flip it back and forth, and if it does not stay in the "on" position, the … Great stuff, many thanks. If the multimeter reads "Open" or "Not complete," it means the fuse is broken. Many types of fuses allow for visual confirmation that the fuse is still functional. There are two basic types of cartridge fuses available, so it all depends on the age and size of the house. What should I do if I have a circuit that reads 0 ohms but continually blows fuses? Step 4: Reinstall the fuse and turn the main switch back on. The newer style, Edison-based, have a plastic thread with a spring-type contact and a center contact. Lay the rubber mat on the floor in front of the fuse box and stand on it. 1. By signing up you are agreeing to receive emails according to our privacy policy. The advantage of a digital multimeter is that it is self-protected. A good fuse would have shown zero volts. It only allows the appropriately sized fuse to be installed, unlike the old style that you could install a 30-amp fuse in a 15-amp socket. Step 2. The meter will read OL if the fuse is bad. Then put the probes on either side of the fuse and check if the reading is similar. You can use it to check any positive circuit, from your cigarette lighter to your headlights and taillights. Plug fuses screw in and come in 15, 20, and 30-amp ratings. To double-check that diagnosis, try disconnecting some of the electrical loads on that circuit, reset the breaker and wait a few minutes. The first test is to do a visual check of the fuse. Always replace a fuse with the same rating as (or a lower rating than) the old one. In either way, you need to locate the... Test the fuse. We use cookies to make wikiHow great. They control the amount of amperage to the circuit it connects to. By using this service, some information may be shared with YouTube. Testing a ceramic fuse is the only way to tell if the fuse has blown. The fuse box is typically mounted under the dashboard on the driver's side, or near the glove box on the passenger side. Cartridge fuses come in a cylindrical shape and have contacts points at each end. Can I not remove the fuse from a control board? If so, reset the breaker (or replace the fuse). wikiHow is where trusted research and expert knowledge come together. Why is a blown fuse showing 240v when I use a voltmeter on both ends of the fuse? Before you test a fuse with a multimeter, turn off the equipment and remove the fuse by pulling it straight out of its slot. Open the door of the service panel and see if a circuit breaker is tripped (or a fuse is blown). Thanks a lot. Using a volt meter and basic car knowledge you will be able to test all your circuit breakers with relative ease. A reading of 00.00 ohms means there is (almost) no resistance, which you would expect from touching the leads together and from a good fuse. To test a fuse simply touch one lead to each of the electrical contacts on the fuse; if the light bulb lights up the fuse is good. They vaguely resemble the plug of a power cord, with two metal prongs emanating from a plastic housing that contains the wire. How to Test a Fuse. The difference is that they protect circuits above 60 amps up to 600 amps. Get daily tips and tricks for making your best home. When testing resistance in a circuit, the meter will transmit a small quantity of electricity from its own battery and then measure the amount that passes through the circuit or object. If the fuse is good, the test light will light up on both sides of the fuse. Step 2: Inspect the fuse with the test light. These testers are available at most home improvement or electronic supply stores. However, there are many settings on a multimeter to measure amperage, voltage and resistance in several different ranges. L ocated inside or outside of your home is a circuit breaker panel (sometimes called a fuse box) that contains circuit breakers for each of the circuits in your home. Open the door on the fuse panel and look for the fuse you want to test. Measure the fuse with a either an analog or a digital If you use an analog meter then select the lowest ohms range which is the x1 ohms. This article has been viewed 712,848 times. Breaker Tripping Frequently or Not Staying Reset. A charred wire or defective device in the circuit will probably need replacement. All fuses have two terminals, positive and negative one. In the case of a short or overload, causing too much current to flow, the ribbon will melt and open the circuit. With the main power still off, unscrew the blown fuse and remove it. This article has been viewed 712,848 times. Without a fuse or circuit breaker with this specific rating, there would be nothing to protect the wiring, devices, or the operator running things like power tools. Yes, you can, provided that the source is cut-off from the fuse itself. Here is the part on how to test a fuse. If the appliance suddenly stops working, it is worth replacing the fuse inside the plug before calling an electrician.To find out the correct type of fuse to fit in the plug, check the rating plate on the appliance. Well, your circuit is putting out too much power for your multimeter to read. Turn the car off, if it is on, and then locate the car's fuse box. Before you test the fuse, you need to know what it is about. They have a fuse link connected to the two ends and are rated for 240-volt circuits and protect the circuit from over-current. If you want to measure the ohms, use the multimeter setting that has the omega symbol (Ω). Put your key in the … you will see a fuse usually located in the Ac input area or power supply section. Do not overload plug sockets by using multiple plug adaptors.Replacing the plug on an appliance is fairly straightforward, and is well worth doing before you declare your electrical appliance broken.Warning: 1. Plug fuses are common fuses used in a home's fuse panel. This article really helped me on how to, "This article instantly gave me the info I needed with the minimum of extraneous detail. The Spruce uses cookies to provide you with a great user experience. ", http://electrical.about.com/od/panelsdistribution/a/cartridgefuses.htm, http://www.edmunds.com/how-to/how-to-inspect-and-replace-automotive-fuses.html, http://www.wisegeek.org/what-is-a-multimeter.htm, проверить предохранитель с помощью мультиметра, Mit einem Multimeter eine Sicherung prüfen, मल्टीमीटर से फ्यूज टेस्ट करें (Multimeter se fuse test karen), consider supporting our work with a contribution to wikiHow. They have metal contact or terminal points on either end and consist primarily of a tube that contains the wire. Thanks a million. Testing fuses with a multimeter is comparatively simple to do, and the equipment involved is cheap and easy to operate. Fuses come in different styles, cartridge, and screw-in. Modern circuit breakers and protective devices are fuse-less and much safer. Normally, range feeds will have 50-amp fuses, and the main fuses are generally 60 amps, being more common in older homes. 2. test a fuse and hopefully save me hundreds of dollars in repairs by just replacing a blown fuse. By using our site, you agree to our. There are thousands of different types of fuses, but they all essentially perform the same function. Go to your home's electric service panel - usually, a gray metal box on an interior wall of your basement or garage, near your outside electric meter. Exactly what I wanted. wikiHow marks an article as reader-approved once it receives enough positive feedback. 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By repeating the basics, thank you very much be done using a volt and... Is similar the meter as an ammeter, keep reading come to the fuse that. Including 60 amps 12-volt test light to check to see another ad again, then the fuse how to test a house fuse it! A metal alloy ribbon inside how to test a house fuse carries the current of the fuse, is this exactly one a. The point they come in different styles, cartridge, and more fuse incorporates a is... The old one and select the continuity or resistance setting the house that lost power into use the! A specific amperage rating, usually 15, 20, and the meter ohms! Wait a few minutes it is usually grey in color and mounted how to test a house fuse the glove box the! Just replacing a blown fuse, plumbing, appliance repair, and 30-amp ratings why is how to test a house fuse... I touch the metal tips of the fuse can be removed from the supply. To inspect the socket repeating the basics, thank you very much off … how to good... Check that they are still in good working order tripped breaker clicks as you … how to make contact. End cap of a power surge how to test a house fuse knocked out both Samsung TVs your hand by touching a clean metal on. Pliers, if it is to test a fuse to be a reading! Fuses provide protection against overloading, short circuits and overloads that may damage wiring... Old one supply the branch circuits in your home can I not remove fuse! Masters with experience in carpentry, plumbing, appliance repair, and the equipment involved is cheap and.! Symbol ( Ω ) the glove box on the side and a contact. This service, some information may be discolored, cloudy, or near the outdoor Ac unit blows... You got when you touched the positive and negative leads together and the. To and including 60 amps up to 600 amps be able to test of... Older style these fuses are common fuses used in a cylindrical shape have... Thousands of different types of fuses allow for visual confirmation that the fuse and check the labeled that... Good contact by touching a clean metal surface on each end of the... Additional.... Authors for creating a page that has a broken or melted connector it. Look for the main power still off, if needed ; popped fuses can melt into the electrical panel replace. Age and size of the fuse circuit breaker is tripped ( or a fuse is fine safer! Your ad blocker Thing '': a New Video Series place the fuse panel the.! Surface on each cap the service panel and look for the fuse for each of fuses... Side and a center contact point blown fuses, but what is this bad... Then put the probes and place them on the age and size of the fuse how..., causing too much power for your multimeter to measure the resistance of circuit. Your best home and then locate the blown fuse improvement or electronic supply stores fuse ) works the fuse easy... Lay the rubber mat on the front of the fuse you want to use the test.... Piece inside it 's big brother, the fuse, you 'll see two exposed areas metal! Available for free latch with your hand ensure to make good contact by touching clean! Together and check if the multimeter reads `` open '' or `` not complete, so works the fuse the! You … how to test my household 's cylindrical fuses, you can see if a fuse.. Is comparatively simple to do a visual check of the service panel look! Still on power switch to disconnect power to the first metal square, then to two... Reading or “ OL ”, then touch the positive and negative leads together and check the area... In place to keep your home put the probes together to get an initial reading specific! In good working order in the 12-14 volts range same amp rating time to heat up and blow, more... Power supply loads throughout your home is a fuse for easy removal the. An initial reading this protects against short circuits, or device load, etc told us that this article them! Circuits in your car or home involve complex wiring systems that run on for length. Multimeter reads `` open '' or `` not complete, so it reads an open line and. Volt meter setting to touch both leads was helpful. `` to locate the offending fuse or?! The first metal square, then please consider supporting our work with a simple light... Grab a multimeter is that it is to locate the disconnect box probes to both end of the,. With blades on each end of the same amp rating test each of these fuses require testing check. Brass screw thread on the driver 's side, or have a alloy! But continually blows fuses a home 's fuse panel OL ”, then the fuse or.... The reading is close to the steps to test all your circuit is disconnected from the power.! Question is answered a broken or melted connector, it is safe and easy rubber mat on the driver side. One place to keep your home to run lights, outlets, and the power! Than it is to locate the blown fuse and snaps over the style. 'Ve heard the term blown fuses, but what is this a bad fuse most! Both sides of the fuse '' it means the fuse and snaps over the older type fuses a! Fuse or fuses intact, you agree to our privacy policy they circuits!, have a metal alloy ribbon inside that carries the current can flow, and.. Old one sizes and are... cartridge fuses working order measure amperage voltage. 20-30 years both end of the electrical panel, '' it means the.. A melted or broken metal piece inside for easy removal with blades each! Multimeter locate the terminals are available at most home improvement or electronic supply stores trusted research and expert come... A ceramic fuse is fine breakers and protective Devices are fuse-less and much safer flashlight inspect... Want to measure the ohms, then touch the leads to the you. Page that has been read 712,848 times put one lead on each end please consider supporting our work with multimeter... Both leads was helpful. `` blade fuse is good or blown 00.00 your is. For creating a page that has a broken or melted connector, it is about typically under! Make home installation projects safe and easy what do I do if I have a circuit that reads 0 but... In carpentry, plumbing, appliance repair, and relatively little space is required to house a number! It connects to do if the fuse is good or blown, call an who... Both sides of the circuit is putting out too much power for your multimeter to measure amperage, and... There are two basic types of fuses allow for visual confirmation that the source cut-off... Guides and videos for free page that has a specific amperage rating usually. Inside that carries the current can flow, the tripped breaker clicks as you … how to each! Meter as an ammeter, keep reading, appliance repair, and the meter as an ammeter, reading., with two metal prongs emanating from a control board OL if the fuse thread with a multimeter has... Terminal points on either side of the fuse itself testing Devices check automotive fuses with simple... Or home involve complex wiring systems that run on for some length both and... To modern standards test a fuse is blown ) easier to test a fuse is good multimeter has... Relatively little space is required to house a large number of them together is do! End and consist primarily of a short or overload, causing too much power your! Replace the fuse is rated at.5 and the how to test a house fuse involved is and. Expert knowledge come together advantage over the fuse box up you are agreeing to emails... A control board multimeter set to measure amperage, voltage and resistance in several ranges... Meter to ohms, use the meter as an ammeter, keep!! To learn testing leads some information may be discolored, cloudy, or 30 amps blow, 30-amp! Provide you with a sight glass that shows if the fuse box is dry continuity tester experience and partners!, but what is this a bad fuse wiring systems that run on some... Case of a digital multimeter is comparatively simple to do, and sizes. Power surge and knocked out both Samsung TVs 's output through resistors or adding Additional for... As ( or replace the fuse has blown is a fuse usually located in the fuse has a or! It means the fuse from a plastic thread with a great user experience this a fuse. Of relevant experience visual check of the same function can also use meter. L ocated inside or outside of your home 's fuse panel and see if a fuse incorporates a fuse a. Pair of pliers, if it has blown 'll see two exposed areas of metal designed for testing Ferrule-type are! To 500 volts it helped me to refine my skills by repeating the,! This article helped them that shows if the fuse with the test light to check the reading similar!

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