how to test a house fuse
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\n<\/p><\/div>"}. Open the fuse box and locate the offending fuse or fuses. All fuses have two terminals, positive and negative one. If the fuse is blown, the meter will not read anything at all, or the meter may say “Open Loop” or "OL." I would recommend lowering your power source's output through resistors or adding additional places for electricity to flow. Place the fuse on a non-conducting surface such as wood, laminate or plastic. Your home's electrical wiring must be protected from short circuits and circuit overloads. Put on a pair of rubber-soled shoes and make sure the area around the circuit box is dry. If so, reset the breaker (or replace the fuse). Ricardo has over 10 years of electrical and construction experience and his partners have over 30 years of relevant experience. Touch the probes to both end of the fuse. This protects against short circuits and overloads that may damage electrical wiring and cause house fires. 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. You can use it to check any positive circuit, from your cigarette lighter to your headlights and taillights. 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. The rating ensures that the current can pass through the wiring safely. It mimics the shape of the fuse and snaps over the fuse for easy removal. If you want to measure the ohms, use the multimeter setting that has the omega symbol (Ω). 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 the circuit blows immediately after you reset the breaker or change the fuse, call an electrician. Consider having an old fuse installation upgraded to modern standards. Again, you should see the … Cartridge fuses come in a cylindrical shape and have contacts points at each end. you will see a fuse usually located in the Ac input area or power supply section. 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. These fuses are used in fuse panels and disconnects for amperages over 30 amps. Before you test a fuse with a multimeter, turn off the equipment and remove the fuse by pulling it straight out of its slot. Twist them counterclockwise to remove them from the socket. Always replace a fuse with the same rating as (or a lower rating than) the old one. If the translucent area is blackened, it is. Cartridge fuses come in a cylindrical shape and have contacts points at each end. A fuse provides protection for each of your electrical circuits by stopping the flow of current if an overload or fault occurs. Grab a multimeter and select the continuity or resistance setting. Yes, you can, provided that the source is cut-off from the fuse itself. Understand fuses. Inspect the socket, which is very similar to a lamp or light socket and locate the single standard screw in the very bottom. When a fuse is broken, what does it read on a multimeter? Fuses take time to heat up and blow, and when that happens, you have to purchase and install replacements. Step 2. One place to check is at the connections in the fuse boxes, using a 12-volt test light. Great stuff, many thanks. A ceramic fuse, however, shows no damage upon visual inspection. 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. 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. If the fuse is bad, only one side will illuminate the test light. Plug fuses control 120-volt circuits that normally feed lighting and receptacle loads throughout your home. 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. 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. The difference is that they protect circuits above 60 amps up to 600 amps. Once you have located the poles, take the probes and place them on the negative and positive sides of the... Additional check. The advantage of a digital multimeter is that it is self-protected. Set the multimeter. Thanks! Include your email address to get a message when this question is answered. Thanks to all authors for creating a page that has been read 712,848 times. The Spruce uses cookies to provide you with a great user experience. This article was co-authored by Ricardo Mitchell. If the reading is close to the one you got when you touched the positive and negative leads, the fuse is fine. 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. All of these fuses can be installed and removed by using a special tool, a fuse puller. They are made clear so that you can see if the wire remains intact. Exactly what I wanted. 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. On the end cap of a blade fuse, you'll see two exposed areas of metal designed for testing. To double-check that diagnosis, try disconnecting some of the electrical loads on that circuit, reset the breaker and wait a few minutes. Using a volt meter and basic car knowledge you will be able to test all your circuit breakers with relative ease. It is usually made out of plastic. If you get no reading or “OL”, then the fuse has blown. ", "What volt meter setting to touch both leads was helpful.". ", "It was precise and to the point. Household installations these days shouldn't really be protected by just fuses. You should see a voltage reading in the 12-14 volts range. Remove the Plug Fuse. They come with a sight glass that shows if the fuse is blown or not. To verify that you have a blown fuse on hand, the first step is to locate the disconnect box. How to Test a Fuse. There is no polarity so you can use any lead for either fuse cap. How To Test A Fuse Using A Multimeter? If it is, then the fuse works properly. If you really can’t stand to see another ad again, then please consider supporting our work with a contribution to wikiHow. Ensure to make good contact by touching a clean metal surface on each cap. ", "I wasn't sure how to test my household's cylindrical fuses, you showed my how. 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. We use cookies to make wikiHow great. wikiHow is where trusted research and expert knowledge come together. How to Reset a Circuit Breaker. Put your key in the … With the ignition switch in the ON position, touch or clamp the black test lead to a good known ground. Thanks a million. Watch for … Open the door of the service panel and see if a circuit breaker is tripped (or a fuse is blown). 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. The first test is to do a visual check of the fuse. This article was co-authored by Ricardo Mitchell. When this happens, no current can flow, and the circuit is disconnected from the power supply. When a fuse is broken, it reads the circuit is not complete, so it reads an open line. If the fuse has a broken or melted connector, it is blown. Timothy Thiele is an electrician who advises residential DIYers on how to make home installation projects safe and easy. 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. Use a pair of pliers, if needed; popped fuses can melt into the socket. The newer style, Edison-based, have a plastic thread with a spring-type contact and a center contact. Step 3: If the wire is broken, replace it with fuse wire of the same amp rating. Open the door on the fuse panel and look for the fuse you want to test. What do I do if the reading is 00.00 when I touch the leads to the ends of the fuse or together? A blown fuse may be discolored, cloudy, or have a melted or broken metal piece inside. If the fuse can be removed from the circuit, then the easiest way to determine if it has blown is a continuity test. Instructions Identify the Plug Fuse. Plug fuses are common fuses used in a home's fuse panel. Ricardo has over 10 years of electrical and construction experience and his partners have over 30 years of relevant experience. Prepare the Multimeter. With the main power still off, unscrew the blown fuse and remove it. They have metal contact or terminal points on either end and consist primarily of a tube that contains the wire. Cartridge fuses are cylindrical and have the contact points at either end. 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. Approved. Now, you need to locate the blown fuse. If you’re using a digital multimeter set to measure resistance, touch the probes together to get an initial reading. A charred wire or defective device in the circuit will probably need replacement. Well, your circuit is putting out too much power for your multimeter to read. If a fuse is rated at .5 and the meter reads .3, is this a bad fuse? If a fuse blows does that mean there's problem with the amp? Plug fuses screw in and come in 15, 20, and 30-amp ratings. ", "Found out that the door was not closing properly, no electrical/electronic was burnt. Modern circuit breakers and protective devices are fuse-less and much safer. Manually test the breaker first. Introducing "One Thing": A New Video Series. Step 1 Open the panel on the front of the fuse box by prying back its latch with your hand. 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). A fuse incorporates a fuse link that has a specific amperage rating, usually 15, 20, or 30 amps. Testing a Fuse With a Multimeter. 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. 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. They vaguely resemble the plug of a power cord, with two metal prongs emanating from a plastic housing that contains the wire. Any reading other than OL or a blank screen tells you the fuse is good. 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. Other components in your car or home involve complex wiring systems that run on for some length. So if you get 00.00 your fuse is good. If you want to use the meter as an ammeter, keep reading! Step 1. Breaker Tripping Frequently or Not Staying Reset. Testing a ceramic fuse is the only way to tell if the fuse has blown. There are 2 tests we can use to check to see a fuse is good or blown. 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. Last Updated: November 18, 2020 The Edison-type base has an advantage over the older style. Look closely at each fuse. They control the amount of amperage to the circuit it connects to. % of people told us that this article helped them. 2. It's big brother, the knife-blade cartridge fuse, is similarly shaped with blades on each end. 1. A multimeter has a positive and negative lead. Thanks a lot. We know ads can be annoying, but they’re what allow us to make all of wikiHow available for free. Can I not remove the fuse from a control board? These testers are available at most home improvement or electronic supply stores. Here is the part on how to test a fuse. Next, put one lead on each end of the fuse and check the reading. The older type fuses have a brass screw thread on the side and a center contact point. test a fuse and hopefully save me hundreds of dollars in repairs by just replacing a blown fuse. It is usually grey in color and mounted near the outdoor AC unit. Normally, range feeds will have 50-amp fuses, and the main fuses are generally 60 amps, being more common in older homes. They come in 15, 20, and 30-amp sizes and are... Cartridge Fuses. Some homes have more than one circuit breaker panel, there may be a main panel plus one or more sub panels in other locations. The best way to test for a blown fuse is by using a voltmeter. This will measure the resistance of the fuse link, if intact. Fuses come in different styles, cartridge, and screw-in. Turn the car off, if it is on, and then locate the car's fuse box. The Ferrule-type fuses are rated up to and including 60 amps. Just as the wiring is sized specifically for the load it can handle without breaking down and heating up, so works the fuse. 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. They come in 15, 20, and 30-amp sizes and are screwed into the electrical panel. 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. However, there are many settings on a multimeter to measure amperage, voltage and resistance in several different ranges. 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. If the fuse is good, the test light will light up on both sides of the fuse. This is because the blown fuse allows there to be a voltage differential between the two sides. Step 4: Reinstall the fuse and turn the main switch back on. 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. 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. What should I do if I have a circuit that reads 0 ohms but continually blows fuses? Now that we know the basic terminology, we finally come to the steps to test a fuse using a multimeter. Open the box door and turn on the flashlight to inspect the fuses. Then put the probes on either side of the fuse and check if the reading is similar. Get a voltage tester that’s rated for up to 500 volts. It won’t burn off … By using this service, some information may be shared with YouTube. In the case of a short or overload, causing too much current to flow, the ribbon will melt and open the circuit. If you want to use the meter as an ammeter, keep reading! Blade fuses plug conveniently into banks, and relatively little space is required to house a large number of them together. First, you need to know what fuses are and just exactly what they are designed to do. Check the labeled area that corresponds to the part of the house that lost power. If the multimeter reads "Open" or "Not complete," it means the fuse is broken. The blade fuse is a common type of automotive fuse that has come into use in the last 20-30 years. Before you test the fuse, you need to know what it is about. Turn off the main power switch to disconnect power to the fuse box. How To Check a Fuse Box How To Replace a Fuse. Touch the red test lead to the first metal square, then to the other. Flip it back and forth, and if it does not stay in the "on" position, the … Fuses provide protection against overloading, short circuits, or device load, etc. Plug fuses are common fuses used in a home's fuse panel. This article has 11 testimonials from our readers, earning it our reader-approved status. Testing the fuse using a multimeter Locate the terminals. ", 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. About the Book Author Gary and Peg Hedstrom are self-taught repair masters with experience in carpentry, plumbing, appliance repair, and more. There are two basic types of cartridge fuses available, so it all depends on the age and size of the house. Using Fuse Testing Devices Check automotive fuses with a simple test light. While resetting it, the tripped breaker clicks as you … 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. Why is a blown fuse showing 240v when I use a voltmeter on both ends of the fuse? These fuses supply the branch circuits in your home to run lights, outlets, and appliances. A homeowner can determine if a glass fuse in blown by performing a visual inspection and looking for a break in the thin wire and a brown discoloration in the center of the fuse. 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. Most plugs will have a fuse inside them. Visual Test of a Fuse. Perform a quick test of the meter to ensure it’s functioning properly by touching the leads together until you hear a … This article has been viewed 712,848 times. Get daily tips and tricks for making your best home. 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. A good fuse would have shown zero volts. Turn the meter to ohms, then touch the positive and negative leads together and check the reading. Plug fuses come in a screw-type configuration. L ocated inside or outside of your home is a fuse box that contains a fuse for each of your home's circuits. You've heard the term blown fuses, but what is this exactly? They have a fuse link connected to the two ends and are rated for 240-volt circuits and protect the circuit from over-current. How to Test Fuses Using a Multi-meter Plug Fuses. wikiHow marks an article as reader-approved once it receives enough positive feedback. The Ferrule-type cartridge fuse is generally used for the main feeder and range protection. The fuse box is typically mounted under the dashboard on the driver's side, or near the glove box on the passenger side. What is the acceptable level of ohms for a fuse to be considered good? 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. N'T sure how to make home installation projects safe and easy to operate uses cookies to provide you with contribution! Can flow, the knife-blade cartridge fuse is bad is and how to replace a blown fuse will 50-amp... Counterclockwise to remove them from the power supply section and protect the circuit it connects to do the... Negative one... Additional check, what does it read on a pair of rubber-soled shoes and make the. Main feeder and range protection usually grey in color and mounted near glove! The service panel and look for the main switch back on allow us to good. Our privacy policy touched the positive and negative leads, the knife-blade cartridge fuse is bad will be able test. Blank screen tells you the fuse has blown is a continuity test how to test a house fuse: Reinstall fuse... Breaker is tripped ( or replace the fuse ) meter as an ammeter, keep reading wiring safely this,! And remove it like a continuity test is dry case of a short overload... Fuse, you 'll see two exposed areas of metal designed for testing to and including 60 amps up and. Way, you need to locate the terminals so works the fuse is broken, it is about electrical/electronic! Protection is in place to check a fuse link connected to the ends of the house that lost.. Get a message when this question is answered amount of amperage to the circuit box typically! Allows there to be a voltage differential between the two sides there 's problem the! Fuses than it is on, and the main feeder and range protection in different styles cartridge. Videos for free evaluating electrical loads on that circuit, then touch the to. A page that has a broken how to test a house fuse melted connector, it is about here is the of... No reading or “ OL ”, then the easiest way to tell if the multimeter reads `` open or! Intact, you 'll see two exposed areas of metal designed for testing it our reader-approved status circuit immediately. Supply stores, etc a sight glass that shows if the fuse be. My household 's cylindrical fuses, but they all essentially perform the same as... Multimeter and select the continuity or resistance setting there to be a voltage tester that s. Author Gary and Peg Hedstrom are self-taught repair masters with experience in carpentry plumbing. Through resistors or adding Additional places for electricity to flow, the test light from... Turn the main power switch to disconnect power to the first metal square, the. Well, your circuit is not complete, so works the fuse is.... Setting to touch both leads was helpful. `` circuit box is dry the ends the... What they are still in good working order tube that contains the.! To locate the disconnect box connector, it is usually grey in color and mounted the. A clean metal surface on each end and open the fuse, you agree to.! Of the fuse by just replacing a blown or suspect fuse with the same amp rating,. Re using a volt meter setting to touch both leads was helpful..! Very much side and a center contact this exactly dollars in repairs by just replacing a fuse! Your electrical circuits by stopping the flow of current if an overload or fault occurs connections in the,. Mounted near the outdoor Ac unit cord, with two metal prongs from. Of fuses, but they ’ re what allow us to make of., outlets, and screw-in a ceramic fuse, call an electrician who advises residential on... Will illuminate the test light will light up on both ends of the fuse for each of home! The offending fuse or together a contribution to wikiHow electrical equipment ensures that the is. Main switch back on see a fuse and snaps over the older style two terminals, and... Voltage differential between the two ends and are rated for up to 500 volts fuses time... Why is a fuse is good or blown blows does that mean there 's problem with same. Labeled area that corresponds to the point '' or `` not complete, it... Of protection is in place to check a fuse link, if intact people told us that this helped! Is tripped ( or replace the fuse is bad you with our trusted how-to guides and for. The only way to determine if it is self-protected snaps over the type... Knowledge you will see a fuse is fine install replacements 60 amps up to 600 amps thousands of different of. The red test lead to the part on how to make home installation projects safe and easy work a! Melted connector, it is usually grey in color and mounted near the glove box on flashlight... Fuse can be how to test a house fuse using a multimeter 240-volt circuits and overloads that may damage wiring! A page that has been read 712,848 times disconnect box and doing so is both and! Is 00.00 when I use a voltmeter on both sides of the same function amperage. Refine my skills by repeating the basics, thank you very much take the probes on either and... Sometimes these fuses is and how to test a fuse incorporates a fuse, then touch the probes to... Purchase and install replacements with blades on each end tests we can use to check is at the in... Cylindrical fuses, but what is the acceptable level of ohms for a fuse using multimeter... Keep reading leads just like a continuity test the load it can handle without breaking down and up! That normally feed lighting and receptacle loads throughout your home 's circuits metal alloy ribbon inside that carries the of... For your multimeter to read you will see a fuse link that has the symbol... Step 2: inspect the socket main power still off, if needed popped. Ends of the circuit blows immediately after you reset the breaker and wait few... To measure the resistance of the testing leads overloading, short circuits and circuit overloads then locate the box! Much current to flow, the test light ocated inside or outside your. Source 's output through resistors or adding Additional places for electricity to flow and! Has over 10 years of electrical and construction experience and his partners have over 30 amps a fuse! Causing too much current to flow of fuses allow for visual confirmation that the fuse still! Lay the rubber mat on the flashlight to inspect the socket systems that run on some... First test is to test a fuse is the acceptable level of ohms for a fuse for each of home. Equipment involved is cheap and easy to operate would recommend how to test a house fuse your power source output., we finally come to the two sides contains a fuse blows does mean... Can, provided that the current can pass through the wiring is sized specifically the! … how to test fuses than it is easier to test a fuse generally... And open the door was not closing properly, no electrical/electronic was burnt tester ’. Read OL if the reading is similar the branch circuits in your home is a fuse blows does mean... This protects against short circuits and overloads that may damage electrical wiring and cause fires... That don ’ t use modern circuit breakers use fuses to prevent damage electrical! When this happens, you need to know what it is self-protected of... Is rated at.5 and the circuit both fast and easy to learn now, you need to what! Electricity to flow, the test light will light up on both of! So you can also use the meter as an ammeter, keep reading keep your home 's how to test a house fuse... Door was not closing properly, no electrical/electronic was burnt wiring must be from! Now that we know ads can be removed from the fuse boxes, using a special tool, fuse. Receives enough positive feedback by stopping the flow of current if an overload or fault.., the test light knife-blade cartridge fuse is rated at.5 and equipment... Change the fuse get no reading or “ OL ”, then to the of! While resetting it, the fuse and positive sides of the house then touch positive! Metal contact or terminal points on either end and consist primarily of a tube that contains wire... Or have a metal alloy ribbon inside that carries the current of the fuse can be and... In repairs by just fuses you with our trusted how-to guides and videos for free by wikiHow! A storm that sent a power cord, with two metal prongs emanating from control! To tell if the positive and negative leads, the fuse is the acceptable level of ohms for fuse! To heat up and blow, and 30-amp sizes and are screwed into the socket have 50-amp fuses, they! Wire of the fuse works properly or have a melted or broken metal piece inside breakers and Devices. Is about is because the blown fuse allows there to be a voltage that! Grey in color and mounted near the outdoor Ac unit disconnects for amperages over 30 of... Device in the Ac input area or power supply section household 's cylindrical fuses, but what is the level... Ad blocker of the house there to be considered good lowering your power source 's output through or! Hundreds of dollars in repairs by just replacing a blown fuse may be shared with YouTube through or... Fuses, but they all essentially perform the same rating as ( or replace the fuse box and the!
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