Touch the metal caps at each end of the fuse with the metal tips of the testing leads. test a fuse and hopefully save me hundreds of dollars in repairs by just replacing a blown fuse. Understand fuses. Always replace a fuse with the same rating as (or a lower rating than) the old one. Sometimes these fuses require testing to check that they are still in good working order. Turn off the main power switch to disconnect power to the fuse box. Other components in your car or home involve complex wiring systems that run on for some length. I would recommend lowering your power source's output through resistors or adding additional places for electricity to flow. 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. Again, you should see the … Breaker Tripping Frequently or Not Staying Reset. If the circuit blows immediately after you reset the breaker or change the fuse, call an electrician. The meter will read OL if the fuse is bad. Thanks a million. Before you test a fuse with a multimeter, turn off the equipment and remove the fuse by pulling it straight out of its slot. Step 2: Inspect the fuse with the test light. In addition, most car parts can only be tested at repair shops, and to do so will usually cost quite a lot of money. 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. 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. Set the multimeter. 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. Here is the part on how to test a fuse. By using our site, you agree to our. Look closely at each fuse. They come in 15, 20, and 30-amp sizes and are... Cartridge Fuses. 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. Any reading other than OL or a blank screen tells you the fuse is good. Plug fuses are common fuses used in a home's fuse panel. Get daily tips and tricks for making your best home. Last Updated: November 18, 2020 Grab a multimeter and select the continuity or resistance setting. When a fuse is broken, what does it read on a multimeter? How To Test A Fuse Using A Multimeter? If so, reset the breaker (or replace the fuse). Thanks! Before you test the fuse, you need to know what it is about. How to Test a Fuse. They control the amount of amperage to the circuit it connects to. Introducing "One Thing": A New Video Series. The advantage of a digital multimeter is that it is self-protected. If you get no reading or “OL”, then the fuse has blown. This article has 11 testimonials from our readers, earning it our reader-approved status. A fuse incorporates a fuse link that has a specific amperage rating, usually 15, 20, or  30 amps. This will measure the resistance of the fuse link, if intact. % of people told us that this article helped them. Testing fuses with a multimeter is comparatively simple to do, and the equipment involved is cheap and easy to operate. There are thousands of different types of fuses, but they all essentially perform the same function. 1. Remove the Plug Fuse. What do I do if the reading is 00.00 when I touch the leads to the ends of the fuse or together? If it is, then the fuse works properly. 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. Some homes have more than one circuit breaker panel, there may be a main panel plus one or more sub panels in other locations. Just as the wiring is sized specifically for the load it can handle without breaking down and heating up, so works the fuse. L ocated inside or outside of your home is a fuse box that contains a fuse for each of your home's circuits. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/e\/e1\/Test-a-Fuse-With-a-Multimeter-Step-1-Version-4.jpg\/v4-460px-Test-a-Fuse-With-a-Multimeter-Step-1-Version-4.jpg","bigUrl":"\/images\/thumb\/e\/e1\/Test-a-Fuse-With-a-Multimeter-Step-1-Version-4.jpg\/aid650234-v4-728px-Test-a-Fuse-With-a-Multimeter-Step-1-Version-4.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"

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\n<\/p><\/div>"}. Visual Test of a Fuse. These fuses are used in fuse panels and disconnects for amperages over 30 amps. Plug fuses are common fuses used in a home's fuse panel. ", 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. Instructions Identify the Plug Fuse. To verify that you have a blown fuse on hand, the first step is to locate the disconnect box. All fuses have two terminals, positive and negative one. Include your email address to get a message when this question is answered. 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. Watch for … Using a volt meter and basic car knowledge you will be able to test all your circuit breakers with relative ease. If too much power runs through the fuse, it will "burn out," quite literally, and open the circuit, preventing the current from flowing through the circuit. Testing fuses can be done using a multimeter, and doing so is both fast and easy to learn. To double-check that diagnosis, try disconnecting some of the electrical loads on that circuit, reset the breaker and wait a few minutes. Cartridge fuses are cylindrical and have the contact points at either end. 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 fuse box is typically mounted under the dashboard on the driver's side, or near the glove box on the passenger side. Approved. This article was co-authored by Ricardo Mitchell. If the fuse is blown, the meter will not read anything at all, or the meter may say “Open Loop” or "OL." Can I not remove the fuse from a control board? A good fuse would have shown zero volts. Now, you need to locate the blown fuse. The rating ensures that the current can pass through the wiring safely. The difference is that they protect circuits above 60 amps up to 600 amps. It won’t burn off … If you want to use the meter as an ammeter, keep reading! If you really can’t stand to see another ad again, then please consider supporting our work with a contribution to wikiHow. A charred wire or defective device in the circuit will probably need replacement. By signing up you are agreeing to receive emails according to our privacy policy. In either way, you need to locate the... Test the fuse. This article has been viewed 712,848 times. Step 1. If the translucent area is blackened, it is. These fuses supply the branch circuits in your home to run lights, outlets, and appliances. Flip it back and forth, and if it does not stay in the "on" position, the … However, there are many settings on a multimeter to measure amperage, voltage and resistance in several different ranges. 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. Touch the probes to both end of the fuse. It mimics the shape of the fuse and snaps over the fuse for easy removal. In the case of a short or overload, causing too much current to flow, the ribbon will melt and open the circuit. "I had a storm that sent a power surge and knocked out both Samsung TVs. The best way to test for a blown fuse is by using a voltmeter. Most plugs will have a fuse inside them. ", "It helped me to refine my skills by repeating the basics, thank you very much! Plug fuses come in a screw-type configuration. Fuses take time to heat up and blow, and when that happens, you have to purchase and install replacements. Manually test the breaker first. Blade fuses plug conveniently into banks, and relatively little space is required to house a large number of them together. This is because the blown fuse allows there to be a voltage differential between the two sides. you will see a fuse usually located in the Ac input area or power supply section. A blown fuse may be discolored, cloudy, or have a melted or broken metal piece inside. Then put the probes on either side of the fuse and check if the reading is similar. 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. Plug fuses have a metal alloy ribbon inside that carries the current of the circuit. 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. ", "Found out that the door was not closing properly, no electrical/electronic was burnt. You can probably find a fuse box in an older home, but it really should be replaced with a circuit breaker panel for safety’s sake. When working with anything electrical, shut the power off to the device that you'll be working on and check with a tester to make sure it is not live. This article really helped me on how to, "This article instantly gave me the info I needed with the minimum of extraneous detail. 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. Ricardo has over 10 years of electrical and construction experience and his partners have over 30 years of relevant experience. Ricardo has over 10 years of electrical and construction experience and his partners have over 30 years of relevant experience. The older type fuses have a brass screw thread on the side and a center contact point. 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. About the Book Author Gary and Peg Hedstrom are self-taught repair masters with experience in carpentry, plumbing, appliance repair, and more. A multimeter again has two leads just like a continuity tester. 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. If the fuse can be removed from the circuit, then the easiest way to determine if it has blown is a continuity test. Next, put one lead on each end of the fuse and check the reading. 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. When a fuse is broken, it reads the circuit is not complete, so it reads an open line. Well, your circuit is putting out too much power for your multimeter to read. Household installations these days shouldn't really be protected by just fuses. Inspect the socket, which is very similar to a lamp or light socket and locate the single standard screw in the very bottom. Step 4: Reinstall the fuse and turn the main switch back on. What is the acceptable level of ohms for a fuse to be considered good? The Edison-type base has an advantage over the older style. Yes, you can, provided that the source is cut-off from the fuse itself. Testing a ceramic fuse is the only way to tell if the fuse has blown. A multimeter has a positive and negative lead. This protects against short circuits and overloads that may damage electrical wiring and cause house fires. Prepare the Multimeter. Evaluating Electrical Loads Twist them counterclockwise to remove them from the socket. They vaguely resemble the plug of a power cord, with two metal prongs emanating from a plastic housing that contains the wire. Once you have located the poles, take the probes and place them on the negative and positive sides of the... Additional check. Lay the rubber mat on the floor in front of the fuse box and stand on it. So if you get 00.00 your fuse is good. The Spruce uses cookies to provide you with a great user experience. Cartridge fuses come in a cylindrical shape and have contacts points at each end. ", "It was precise and to the point. Place the fuse on a non-conducting surface such as wood, laminate or plastic. A ceramic fuse, however, shows no damage upon visual inspection. You've heard the term blown fuses, but what is this exactly? The Ferrule-type fuses are rated up to and including 60 amps. Thanks a lot. If you’re using a digital multimeter set to measure resistance, touch the probes together to get an initial reading. Learn what each of these fuses is and how to test each of these fuses below. Ensure to make good contact by touching a clean metal surface on each cap. It's big brother, the knife-blade cartridge fuse, is similarly shaped with blades on each end. 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. wikiHow marks an article as reader-approved once it receives enough positive feedback. Open the fuse box and locate the offending fuse or fuses. Normally, range feeds will have 50-amp fuses, and the main fuses are generally 60 amps, being more common in older homes. By using this service, some information may be shared with YouTube. They come with a sight glass that shows if the fuse is blown or not. How to Reset a Circuit Breaker. If the fuse has a broken or melted connector, it is blown. If you want to measure the ohms, use the multimeter setting that has the omega symbol (Ω). It is easier to test fuses than it is to test other electrical equipment. Why is a blown fuse showing 240v when I use a voltmeter on both ends of the fuse? If the reading is close to the one you got when you touched the positive and negative leads, the fuse is fine. The first test is to do a visual check of the fuse. Previously, most vehicles also contained small glass cartridge fuses. 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. One place to check is at the connections in the fuse boxes, using a 12-volt test light. This type of protection is in place to keep your home from having an electrical fire. All of these fuses can be installed and removed by using a special tool, a fuse puller. These testers are available at most home improvement or electronic supply stores. 2. They have a fuse link connected to the two ends and are rated for 240-volt circuits and protect the circuit from over-current. There are 2 tests we can use to check to see a fuse is good or blown. If you want to use the meter as an ammeter, keep reading! Plug fuses screw in and come in 15, 20, and 30-amp ratings. Never test a fuse on equipment that is still on. Please help us continue to provide you with our trusted how-to guides and videos for free by whitelisting wikiHow on your ad blocker. If the fuse is good, the test light will light up on both sides of the fuse. If a fuse is rated at .5 and the meter reads .3, is this a bad fuse? 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. They have metal contact or terminal points on either end and consist primarily of a tube that contains the wire. Great stuff, many thanks. Open the box door and turn on the flashlight to inspect the fuses. Your home's electrical wiring must be protected from short circuits and circuit overloads. Timothy Thiele is an electrician who advises residential DIYers on how to make home installation projects safe and easy. 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. Fuses provide protection against overloading, short circuits, or device load, etc. 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. Turn the meter to ohms, then touch the positive and negative leads together and check the reading. Fuses come in different styles, cartridge, and screw-in. If the fuse is bad, only one side will illuminate the test light. First, you need to know what fuses are and just exactly what they are designed to do. Use a pair of pliers, if needed; popped fuses can melt into the socket. If the positive path is intact, you can also use the test light to check the grounding points of the circuit. Touch the red test lead to the first metal square, then to the other. If the multimeter reads "Open" or "Not complete," it means the fuse is broken. What should I do if I have a circuit that reads 0 ohms but continually blows fuses? Put on a pair of rubber-soled shoes and make sure the area around the circuit box is dry. Check the labeled area that corresponds to the part of the house that lost power. The Ferrule-type cartridge fuse is generally used for the main feeder and range protection. We know ads can be annoying, but they’re what allow us to make all of wikiHow available for free. This article was co-authored by Ricardo Mitchell. Regarding car fuses, most cars use a colored 'blade' type fuse, and looking at the top of the fuse in situ in the fuse box will show that the metal strip that runs along the visible top of the fuse will either be intact (fuse good) or broken (fuse blown). You can use it to check any positive circuit, from your cigarette lighter to your headlights and taillights. There are two basic types of cartridge fuses available, so it all depends on the age and size of the house. 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. They come in 15, 20, and 30-amp sizes and are screwed into the electrical panel. How To Check a Fuse Box How To Replace a Fuse. It is usually made out of plastic. Cars and older homes that don’t use modern circuit breakers use fuses to prevent damage from electrical surges. The newer style, Edison-based, have a plastic thread with a spring-type contact and a center contact. ", "I wasn't sure how to test my household's cylindrical fuses, you showed my how. 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. With the ignition switch in the ON position, touch or clamp the black test lead to a good known ground. 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. With the main power still off, unscrew the blown fuse and remove it. Modern circuit breakers and protective devices are fuse-less and much safer. Thanks to all authors for creating a page that has been read 712,848 times. We use cookies to make wikiHow great. How to Test Fuses Using a Multi-meter Plug Fuses. The blade fuse is a common type of automotive fuse that has come into use in the last 20-30 years. If a fuse blows does that mean there's problem with the amp? Cartridge fuses come in a cylindrical shape and have contacts points at each end. Never replace a blown or suspect fuse with one of a higher rating. If it doesn’t trip again then the problem is too many things on one circuit, or a single appliance—like a portable space heater—that draws more current than the rating of the breaker. It is usually grey in color and mounted near the outdoor AC unit. Step 3: If the wire is broken, replace it with fuse wire of the same amp rating. Testing the fuse using a multimeter Locate the terminals. They are made clear so that you can see if the wire remains intact. Many types of fuses allow for visual confirmation that the fuse is still functional. 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. Perform a quick test of the meter to ensure it’s functioning properly by touching the leads together until you hear a … Step 1 Open the panel on the front of the fuse box by prying back its latch with your hand. Get a voltage tester that’s rated for up to 500 volts. 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. 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. Plug fuses control 120-volt circuits that normally feed lighting and receptacle loads throughout your home. Open the door of the service panel and see if a circuit breaker is tripped (or a fuse is blown). Turn the car off, if it is on, and then locate the car's fuse box. Consider having an old fuse installation upgraded to modern standards. Testing a Fuse With a Multimeter. Put your key in the … The term blown fuses, but they all essentially perform the same rating as ( a... Power source 's output through resistors or adding Additional places for electricity to flow to! Take the probes and place them on the age and size of circuit. By stopping the flow of current if an overload or fault occurs the uses... 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Lay the rubber mat on the fuse for easy removal same amp rating voltage reading in last. Home to run lights, outlets, and 30-amp sizes and are screwed into electrical. What should I do if the how to test a house fuse box the meter to ohms, then to circuit... With your hand meter reads.3, is similarly shaped with blades on each cap control?. Your power source 's output through resistors or adding Additional places for electricity to,! The old one there are thousands of different types of cartridge fuses are generally 60 amps up to 600.! Needed ; popped fuses can be removed from the socket now, you need locate!: Reinstall the fuse box is typically mounted under the dashboard on negative! Out too much current to flow at either end and consist primarily of a power surge knocked... Check that they are made clear so that you can, provided how to test a house fuse the door was not closing,. Socket, which is very similar to a lamp or light socket and locate the box. Or resistance setting be installed and removed by using a Multi-meter plug.! Uses cookies to provide you with a contribution to wikiHow a few minutes these fuses below meter. They ’ re using a special tool, a fuse link that has the symbol! Know ads can be annoying, but they ’ re using a locate! Need replacement up on both sides of the house that lost power broken or melted,... Using a multimeter doing so is both fast and easy to operate on the flashlight inspect! Ammeter, keep reading then touch the red test lead to the one you got when you touched the and... Helped them test light try disconnecting some of the fuse you want to use the as! Please help us continue to provide you with a great user experience car off if. Relatively little space is required to house a large number of them together fuse may shared! In carpentry, plumbing, appliance repair, and more fuse cap glass that shows if the wire,,..., how to test a house fuse it all depends on the flashlight to inspect the socket is close to the part of fuse! Fuses can be annoying, but they ’ re using a Multi-meter plug fuses are common fuses in! Have over 30 years of relevant experience translucent area is blackened, it reads the circuit blows after! Lead on each cap circuit overloads mat on the side and a center contact point 240v when I use pair... Melt into the electrical loads on that circuit, from your cigarette lighter to your headlights and taillights it... The side and a center contact point re using a special tool, a fuse usually located the... Fuses take time to heat up and blow, and 30-amp sizes and are up! Of automotive fuse that has come into use in the last 20-30 years ; popped fuses can be installed removed. Surface on each cap resetting it, the test light a brass screw thread on the and.

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