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\n<\/p><\/div>"}. A fuse provides protection for each of your electrical circuits by stopping the flow of current if an overload or fault occurs. A good fuse would have shown zero volts. However, there are many settings on a multimeter to measure amperage, voltage and resistance in several different ranges. Fuses take time to heat up and blow, and when that happens, you have to purchase and install replacements. 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. We use cookies to make wikiHow great. Testing the fuse using a multimeter Locate the terminals. Open the fuse box and locate the offending fuse or fuses. The newer style, Edison-based, have a plastic thread with a spring-type contact and a center contact. If the fuse is good, the test light will light up on both sides of the 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. These fuses supply the branch circuits in your home to run lights, outlets, and appliances. Twist them counterclockwise to remove them from the socket. Now that we know the basic terminology, we finally come to the steps to test a fuse using a multimeter. Ensure to make good contact by touching a clean metal surface on each cap. In either way, you need to locate the... Test the fuse. It is easier to test fuses than it is to test other electrical equipment. This is because the blown fuse allows there to be a voltage differential between the two sides. Plug fuses have a metal alloy ribbon inside that carries the current of the circuit. Blade fuses plug conveniently into banks, and relatively little space is required to house a large number of them together. If the reading is close to the one you got when you touched the positive and negative leads, the fuse is fine. 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. How to Test a Fuse. There are 2 tests we can use to check to see a fuse is good or blown. Ricardo has over 10 years of electrical and construction experience and his partners have over 30 years of relevant experience. A blown fuse may be discolored, cloudy, or have a melted or broken metal piece inside. ", "What volt meter setting to touch both leads was helpful.". By using our site, you agree to our. Your home's electrical wiring must be protected from short circuits and circuit overloads. Turn the car off, if it is on, and then locate the car's fuse box. How to Test Fuses Using a Multi-meter Plug Fuses. Open the door of the service panel and see if a circuit breaker is tripped (or a fuse is blown). If the fuse is blown, the meter will not read anything at all, or the meter may say “Open Loop” or "OL." This article really helped me on how to, "This article instantly gave me the info I needed with the minimum of extraneous detail. 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. About the Book Author Gary and Peg Hedstrom are self-taught repair masters with experience in carpentry, plumbing, appliance repair, and more. Never replace a blown or suspect fuse with one of a higher rating. Testing a Fuse With a Multimeter. 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. Can I not remove the fuse from a control board? Learn what each of these fuses is and how to test each of these fuses below. Include your email address to get a message when this question is answered. Sometimes these fuses require testing to check that they are still in good working order. The meter will read OL if the fuse is bad. Most plugs will have a fuse inside them. Other components in your car or home involve complex wiring systems that run on for some length. By using this service, some information may be shared with YouTube. Last Updated: November 18, 2020 Perform a quick test of the meter to ensure it’s functioning properly by touching the leads together until you hear a … They come with a sight glass that shows if the fuse is blown or not. Testing fuses can be done using a multimeter, and doing so is both fast and easy to learn. Next, put one lead on each end of the fuse and check the reading. Visual Test of a 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. Flip it back and forth, and if it does not stay in the "on" position, the … wikiHow marks an article as reader-approved once it receives enough positive feedback. Then put the probes on either side of the fuse and check if the reading is similar. Thanks a lot. Step 1 Open the panel on the front of the fuse box by prying back its latch with your hand. Inspect the socket, which is very similar to a lamp or light socket and locate the single standard screw in the very bottom. Consider having an old fuse installation upgraded to modern standards. If you really can’t stand to see another ad again, then please consider supporting our work with a contribution to wikiHow. The Spruce uses cookies to provide you with a great user experience. If the circuit blows immediately after you reset the breaker or change the fuse, call an electrician. With the main power still off, unscrew the blown fuse and remove it. How To Check a Fuse Box How To Replace a Fuse. Open the door on the fuse panel and look for the fuse you want to test. Set the multimeter. All of these fuses can be installed and removed by using a special tool, a fuse puller. Step 3: If the wire is broken, replace it with fuse wire of the same amp rating. Touch the red test lead to the first metal square, then to the other. test a fuse and hopefully save me hundreds of dollars in repairs by just replacing a blown fuse. 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. wikiHow is where trusted research and expert knowledge come together. you will see a fuse usually located in the Ac input area or power supply section. Timothy Thiele is an electrician who advises residential DIYers on how to make home installation projects safe and easy. Here is the part on how to test a fuse. Put on a pair of rubber-soled shoes and make sure the area around the circuit box is dry. Always replace a fuse with the same rating as (or a lower rating than) the old one. This article has 11 testimonials from our readers, earning it our reader-approved status. Some homes have more than one circuit breaker panel, there may be a main panel plus one or more sub panels in other locations. To verify that you have a blown fuse on hand, the first step is to locate the disconnect box. 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. While resetting it, the tripped breaker clicks as you … Turn off the main power switch to disconnect power to the fuse box. 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. If the fuse has a broken or melted connector, it is blown. Introducing "One Thing": A New Video Series. What do I do if the reading is 00.00 when I touch the leads to the ends of the fuse or together? If so, reset the breaker (or replace the fuse). 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 the circuit in your home quits working, and you suspect that it is likely a blown fuse, you can test that theory by using a multi-meter for testing fuses. Grab a multimeter and select the continuity or resistance setting. Step 4: Reinstall the fuse and turn the main switch back on. This protects against short circuits and overloads that may damage electrical wiring and cause house fires. The difference is that they protect circuits above 60 amps up to 600 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. Household installations these days shouldn't really be protected by just fuses. Normally, range feeds will have 50-amp fuses, and the main fuses are generally 60 amps, being more common in older homes. By signing up you are agreeing to receive emails according to our privacy policy. In the case of a short or overload, causing too much current to flow, the ribbon will melt and open the circuit. How to Reset a Circuit Breaker. The Ferrule-type cartridge fuse is generally used for the main feeder and range protection. If it is, then the fuse works properly. The first test is to do a visual check of the fuse. Before you test the fuse, you need to know what it is about. If a fuse blows does that mean there's problem with the amp? This will measure the resistance of the fuse link, if intact. If you get no reading or “OL”, then the fuse has blown. ", 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. Overload, causing too much power for your multimeter to read I a. Loads using fuse testing Devices check automotive fuses with a sight glass that if... To get a voltage differential between the two ends and are rated for 240-volt circuits and protect circuit... You need to know what it is usually grey in color and mounted near glove! What does it read on a multimeter to measure the resistance of the fuse call! Common fuses used in a home 's circuits research and expert knowledge come together very much so. 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