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Electrical Troubleshooting

~1000 answered questions
Parent Category: Electrical Wiring
Electrical troubleshooting involves checking and resolving an electrical problem (such as when an electrical device stops working correctly). Common troubleshooting practices include checking if the power is on, the bulb has burnt out, or the breaker tripped.
Electricity comes from many sources. Such as coal power plants, nuclear power plants and renewable energy sources such as wind, solar and hydroelectric dams. There is a great EPA calculator to help you know which sources your electricity comes from and how clean they are: If you live in Minneapo…
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for USA, Canada and countries using similar 60Hz household electricity supplies First, get the circuits around the house tested to make sure it's happening everywhere. You should call the power company to check the connections where your electrical service enters your house. (Meter base and breaker…
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Heaters use a lot of power and can easily exceed the capacity of an already loaded circuit. Anything with a motor or fan will use more power when starting up than after it is already running. If the circuit breaker or fuse is tripping when you plug in or turn on the heater, then you may have too man…
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The upstream supply has been interrupted.
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%DETAILS% Answer One possible reason is arcing inside the lamp socket. Loose bulbs can arc inside the socket. One sure sign of arcing is if the light "flickers" when it is on. Take the bulb out of the fixture and examine the contacts on the base. If any part of the base appears burned, there is…
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A loose or disconnected neutral wire at breaker box or at the appliance. Depending on what is on when and if two or more motors are running at the same time. This can as well have the opposite effect too, lights too bright. Although loose connection can cause a problem and you should have all th…
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If a breaker will not stay in the off position it is defective, no matter how you wire it, and needs to be replaced.   there was probably a hot wire in that mess in that box and you just mistied them when you installed the switch are you sure that was a ground and not a hot going somewhere el…
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Having the surge protector should not affect individual circuits. It sounds more like to me you have a bad neutral somewhere. By that I mean a wire is loose. So say the light switch or TV is left on and the bad connection is currently open, neither work. So the wind or gremlins in your house do thei…
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This is a form of corrosion sometimes found on wiring or in the outlets. You need to have a licensed electrician replace the receptacles and to inspect the wiring to see if it may also need to be replaced. Either turn off the breaker or pull the fuse that supplies power to this room until it is repa…
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Tighten the bulb/plug Make sure both the hot (black) and neutral (white) connections under the wire nuts are solid, and that terminals (screws) are tight. <><><> If neither of the above tips help to fix the problem it could be caused by a loose connection anywhere else i…
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The problem sounds like it could be a simple as a loose wire at the outlet, sometimes the outlets are wired using the stab in terminals in the back of the outlet instead of the binding screw,any movement causes the circuit to open. However if you are tripping the circuit breaker when you plug in you…
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%REPLIES% Answer Actually I have experienced this problem, as I bet have a lot of other people. An AC uses a large amount of electrical current. Whenever it switches on it causes a temporary power drain and lights will often dim or flicker. My neighbor is a retired electrician from Boeing Ai…
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GFCI receptacles are extremely sensitive, there are any number of reasons this may not be working for you. The first thing you can do is to make sure that the wire feeding your 2 other outlets off of the outside GFCI are connected to the line side of the device. There are 2 sides to any GFCI: the "l…
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Yes, you can, and it won't burn out IF>>> the horsepower rating is the SAME. Pay attention to wiring and motor rotation.Also check the voltage: the motor voltage must be the same as the voltage between two hots of your 3 phase system. You will only use two hots as this is a single phase mot…
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It sounds like a loose connection. If it is all lights then look in main panel. If just some lights look at the switch first for loose connections. There is a good chance that the neutral from the service entrance cable to the panel is loose. BE VERY CAREFUL WHEN WORKING IN THE PANEL. Even when the …
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No it does not mean you have a 200 amp service. you should / could possibly have a "main" breaker. That breaker size is your service size.
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The best way to improve power factor is by adding capacitors. Low power factor is due to reactive loads (motors, pumps, etc.) that are connected to your electrical system. ADDITION The best way to improve power factor in the case of motors is to use a motor drive, like a Variable Frequency Drive. …
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On the inside of the heater cover, and within the documentation shipped with the heater, there should be a diagram of the control circuit. These heaters will not operate if the pump is off (pressure switch), if the "fireman" switch is off (a switch generally inside the pump timer that disables the h…
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Answer i am 6 grade and long ago i dropped my phone in a cup of water. it did not work for a long time so i put it away for like months. well i wanted to use it again so i got it and put it in the frezzer for like 4 or 5 minutes chargerd it and now it works even better. put it in the frezzer if w…
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Answer for USA, Canada and countries running a 60 Hz power supply service. Old practice [accepted by National Electrical Code requirements] allowed the frame [chassis] of dryer to be bonded to the neutral conductor by a link to provide ground. New NEC requirements call for separation …
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Answer for USA, Canada and countries running a 60 Hz power supply service. Those are called "ground fault interrupter" (GFCI) outlets. They test to see if a fault exists anywhere on the circuit. They were once only used to protect kitchen and bath outlets and sockets fitted outside the house. Beca…
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You identify what you goals are and write them down. You then think about what you need to do to get to those goals and write out the steps you have identified. You then think about which steps need doing before others and put all the steps in order. You then think about how you would measure the…
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As a service electrician, I saw this many times. I would bet a paycheck on the fact that there's a GFI you haven't found yet, or a tripped breaker that doesn't look tripped. Start at your breaker panel. Without forcing them enough to actually turn them off, wiggle the breaker handles slightly to s…
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on any 12v car, the alternator output should be between 13.6v to 14.4.
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If there were no electricity life (and all chemical reactions) would be impossible, so I would not even exist to do anything.
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A relay will have a control circuit and a function circuitcould be the same feed line.One set of terminals (Hot and Load) can be activated at all times, but will not function until the control circuit is closed.The control circuit has a Hot and a Ground--when activated either by supply hot or ground…
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to transfer power from the stator to the rotor. there are similar to the commutators but not segmented; they are continuous.
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A Miniature Circuit Breaker or "MCB" works as a normal electrical circuit breaker but is a much smaller device. As well as electro-mechanical relay technology it includes electronic circuitry to achieve its small overall size. MCBs are now used extensively for consumer power-distribution panels and …
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Electricity is one of the many forms of energy naturally occurring in the universe. Specifically, electricity is the flow of electrons through a conductor, like a wire. It comes from other forms of energy. In the case of a power plant it comes from burning of fuel, nuclear reactions, rays of sunligh…
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Broad question.... Never become the path to ground, If the electricity flows across your heart, little as .4 milli amps could stop your heart. If you know its hot or energized and you have to work it hot have someone there with you and make them aware of the hazard and what to do.... worse case scen…
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im not talking about the cord itself , im talking about the brick or trasformer thats located inline that regulates current to your lap top. main question again is this suppose to get hot ? Hot cords I assume you mean the cord itself is hot. Yes, this happens when you are either putting to much load…
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kW is the unit of real power & kVA is the unit of Apparent power. Apparent Power= real power + reactive power Besides this,the ratings which we write on a motor or generator is KVA & not KW. B'coz there are two types of losses in a motor or generator- core losses & ohmic losses. Core …
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As we know numerical relays use DIGITAL SIGNAL PROCESSOR as its computational hardware and based on microprocessor. WORKING: Analog input is feed into the anti aliasing filter which is a low pass filter.Output of this filter is feed into the sample and hold circuit , frequency of sampling should b…
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Call a qualified electrician. If you are wanting to test a power circuit (120/240) at your home, there is no way to teach you on-line all the electrical safety (NFPA 70E) that you would need to know to use a multi-tester safely! Electricity is DANGEROUS!! Call a qualified electrician. <&g…
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see www.soe.ucsc.edu/classes/cmpe150/Fall05/lecture6.ppt for the answer   The biggest is less attenuation (degradation) of signal, so that a message can travel significantly further over an optical fibre than over a copper (twisted pair of coax) cable before it becomes too garbled to understan…
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If you are referring to a megohm meter, it is a test of the insulation properties of such things as electric wiring, motor windings and high power antenna mounts. We use a "megger" or "meg out" electrical wiring and equipment to see if it is shorted to ground in any way. The megger uses much highe…
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Static electricity and Current electricity
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Start winding determines the direction of rotation.Start windings are considered "secondary windings" and run windings "primary". Usually, the start windings disconnect from the power circuit and dry film capacitor(s) at about 75% of the motors full speed. There are some motors with oil filled capac…
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You have a loose connection somewhere. It is very common especially if your wiring is aluminum, Because when amperage flows through a conductor it heats up, when something heats ups and cools off it expands and contracts, aluminum has a lower melting temp. than copper there for it expands more so th…
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Solar Powered or by burning coil.
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Safety precaution in electricity is very critical as it prevents hazards. This is ensuring that you do not come into direct contact with live electric current which might cause fatality.
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Answer Because if you don't know exactly what you are doing and you don't take good care not to touch the wrong things you can easily have a critical accident and electricity can kill you!
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Technical Answer A detailed procedure to complete the correct modifications in the circuits is available at CondorAudio's website: The modifications fall into 4 categories. You may choose to make any or all of these modifications to suit your own needs. 1. Conversion of input voltage to receive 22…
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Artificial dams such as on a river may have a hydroelectric power plant or station attached to them (unless they were built for irrigation or other purposes). Dams are used to store water so it can be released in a controlled way. Hydroelectricity is derived from the potential energy that wate…
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Do you have the wiring diagram for a Hyundai 36 volt 1204 controller???? You can download a complete manual, including the wiring diagram and instructions for testing and replacement, from Curtis Industries. This URL will take you directly there:http://curtisinst.com/index.cfm?fuseaction=cProducts.D…
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The expense of your electricity bill depends on the amount of usage. Turn off any applications that aren't needed to be on. Even though some applications are off, they may still drain little electricity if they're plugged in. A way to save money, depending on the area you live in, solar panels and a…
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Megger testOn the whole megger testing is non destructive. What happens is a DC voltage is applied to the device or winding under test. It is an insulation test to see is the insulation has been injured in any way to cause a short circuit when normal power is applied to it. On my megger there are 3 …
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KW is the unit power KWh is the unit of electrical energy KW or Watt defines the rating or power of a electrical equipment. For ex: motors, heaters etc. KWh is a measurement that how much energy is been consumed by the electrical equipments. Generally, operating 1KW rated equipment for an hour measu…
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It depends on where the breaker is fitted. Is it installed in a panel in the US, Canada or another country which also uses the 60Hz, 120 Volts standard supply service?Or is it fitted in Europe or elsewhere using the 50Hz, 230 Volts standard?<><><>As always, if you are in doubt abou…
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AnswerThere are two ways to answer this question, depending upon what the questioner means by the "size" of a light bulb. . Size as form factorThe physical size of a light bulb makes no difference upon the amount of energy that is consumed. A large globe light, like around a vanity mirror, that …
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Testing Bipolar NPN or PNP transistorsIf you have an ohmmeter or continuity tester, it's not hard to check a Bipolar transistor. First, set your ohmmeter on "Diode" mode (or turn it to the lowest Ohms range.) Identify the transistor's Base pin. Next, for NPN transistors connect the ohmmeter's posit…
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ferranti effect...  B. *If we use capacitive load the stator MMF aid the rotor MMF. It means that in times of capacitive load rotor flux and main field flux are additive. So the alternator voltage increase with capacitance loading. [By Akhtaruzzaman08]
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1. Describe the electrical systems you have worked on and how did you get your training? 2. What is your experience with electrical schematics? 3. What is your experience with ladder logic? 4. Describe the malfunctions you have experienced with PLC hardware? 5. Describe a tough electrical troubl…
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In a well designed house the lights are not connected to the same circuit as an appliance. If by going out you are saying that a breaker trips, then your appliances and lights combined are exceeding the rating of the breaker. You either need to rewire and balance the loads better or plug high curren…
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In electronic circuits, Vss is ground or 0v and Vdd is the the positive supply. The s and d come from the source and drain connections on MOS transistor devices. In a similar way Vcc is also the positive supply, the c coming from the collector on bipolar transistors. The terms Vcc and Vdd are normal…
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It could! If wired in series in a way that is commonly done, linking receptacles on a common circuit, this especially true with GFCI outlets, allowing one GFCI to protect all outlets down stream. However, it would be unusual to find another type of device wired in this way. Regular receptacles have…
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There are no insides of a star delta starter. The components consist of two three phase contactors joined on a common back plate with a mechanical interlock between them so as to prevent both contactors being able to pull in at the same time. <<>> There are two ways of wiring three pha…
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In mains power generation terminology power is commonly generated at the power station in three separate "phases". The "Hots" ("Live" wires in European parlance) of each of the phases are timed to "lag" each other in wave/cycle terms as follows: the Hot of the first phase is generated at 0o (Zero de…
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If your referring to cat5, cat5e, cat6 wire, what you have is two wires that carry voltage, when voltage travels on wire it creates a magnetic field around the wire, you have two wires that carries voltages and both wires are creating a magnetic field... then you have eddy currents... take two magne…
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wiring on aftermarket dash mounted ignition switch
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It is just product of voltage and current at unity powerfactor(UPF) or power at UPF. 1kva is one kilovolt amp or 1000 volts at 1000 amps.
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A polarity test is used to find out the electrical polarity (positive or negative) of the voltage at a given point within a circuit relative to some other point. Most multimeters, including digital multimeters, can do this.Answer regarding alternating current In the context of an a.c. supply, a pola…
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kVA - Kilo Volt Ampere The calculation used to find kVA is P=I x EWhere P is Power in Watts (W)I is the current in Amperes (A), andE is applied voltage in Volts (V)The result is divided by 1,000 to denote the k for kilo. As such a voltage of 120 with 10 amperes being drawn would equate to 1200 watt…
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For alternator electrical circuit input voltage = output voltage + ( current * alternator_impedance ) alternator internal developed voltage ( in the above equation it is referred as input voltage ) is constant, since the speed of rotation and field is constant throughout the operation. alternator…
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Google star delta motor connections. If a motor is wired in star-delta (Yd), it starts up with lots of torque and then switches over to delta for normal "running". This is because the start-up current per phase when delta connected is much larger than star.
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The Star/Delta starter was probably the most commonly used reduced-voltage starter, but in a large number of applications, the performance achieved is less than ideal, and in some cases, the damage and interference is much worse than that caused by a Direct On Line starter. Electronic motor-control …
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The main breaker will have marking indicating size of electrical service, or if it is a fuse system....the fuses will have current ratings. If it is a subpanel, it might not have a main breaker. In this case you would have to look in the panel that the feed is coming from and find the size of the br…
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See related links below for answer.This link should be very helpful.
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the bms system is working through the logic created and controlled by the controller and the sensors based on the return air sensor in hvac bms system
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If the element has failed you will still have 240V going to the element itself: it just won't be causing the element to heat up. Make sure the dryer is unplugged! Then take the back off the dryer and pull the element out - it's usually held by just a few screws. BEFORE YOU UN-CLIP THE WIRES FROM …
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Try your local library web site. Some have on line data bases that allow access to Chilton Auto Repair Manuals.
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When an electrical appliance becomes faulty or ground fault exists, and excessive amount of electric current flows and can produce a large amount of heat. If the excessive electric current is over a certain value the miniature circuit breaker will "TRIP" automatically to break the flow of current i…
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potetial free contacts is a contact of switch or relay that use an external supply, its contact only used to joined tow equipements by electrical supply.mamoun elrayahsudan-gnpoc
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Of course you study and you are a graduate of an electrical engineering course. You also pass the electrical engineering board exam.
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its a spike of voltage
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Wavelength is the distance between corresponding (identical) phase points of a wave, the period over which a wave or signal repeats.In electricity, it is the amplitude of a sine wave plotted over time.
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Answer for USA, Canada and countries using similar 60Hz mains supplies Answer Any socket outlets or wiring to pumps, etc must be protected by a GFCI, not only by the main circuit breaker on the house AC power supply panel. Sounds like there is water somewhere in the circuit and that is ca…
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first i need to know which model i have some or you can purchase a clymers manual #m420
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Parking lights may stay on after a BMW is turned off because the headlight is bad. A faulty relay could also cause this problem.
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Our early ancestors cooked over an open fire just outside the cave's entrance. When man started building houses, the fire came indoors in the form of a wood burning stove. Later on, the wood stove gave way to coal fired stoves to cook on. On the invention of electricity the coal burning stove gave w…
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I would first check your spark plugs, if that's not it replace your fuel filter, if that's not it its probably your fuel pump and need to get it professionaly fixed
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If you mean "hot" as in "electrically live", this wall outlet is dangerous and should be investigated and repaired urgently by a licensed electrician. The reason is probably that the wire going into the grounding terminal on the wall outlet is not actually connected back to the grounding point on t…
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In the US the larger prong is Nuetral and the smaller is Live or Positive.
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0.8A/sqmm for copper and 1.2A/sqmm for Aluminium........... I think, it should be vice versa..............
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safe isolation 3 phase
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Fuse testers are use to test fuse if they are still working good.Continuity testers
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To better understand how to perform this test, it is important to understand what a megger test does. A megger traditionally utilizes a relatively high voltage {500vdc} to detect minute leakage current in an insulator or conductor. These "pinhole" leaks lead to current arcing and eventually an elect…
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Simply test it with a multi meter. Set to DC and see if it is holding voltage. Then,...Set the meter on Ohms to check the continuity between the leads. If it shows little or no resistance, or doesnt beep, normally youre ok. If it beeps or shows resistance, its fried. Afterwards, since the voltage sh…
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pool pump wiring in what regard? To hard wire or not to hard wire? My choice would be to NOT hardwire and look at other alternatives to conserving power such as changing the type of pump to a variable speed pump - less draw on your power whilst having the ability for capacity power when you need it …
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if you know the number of amperes and the cross sectional area you can find the current density
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You probably don't need to rearrange your lighting load. Just replace the switch with a new one. <><><> Wall switches are mechanical devices that do break. Sometimes it is a manufacture defect, it could be from user abuse or normal wear and tear. All light switches will eventuall…
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Some breakers must be turned all the way to the OFF position after they have tripped. Before you spend a lot of money, just flip the breaker all the way to the off position THEN try to turn it back on. Other answers If this circuit breaker is a GFCI or RCD and it won't reset when you press its RESE…
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More cranking power. The same reason, if your trying to fill up a swiming pool. The more or higher pressure of flow of water will fill the pool up faster... more water in less amount of time. More voltage more flow of electrons in a given time and the higher the voltage the lower the amperage draw …
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There are basically two types of meggers, an electronic one and the old-fashioned hand-cranked type. On the whole megger testing is non-destructive. What happens is a DC voltage is applied to the device or winding under test. It is basically an insulation test to see if the insulation has been inju…
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KW is kilowatts, and KVA is kilovoltamps. KW is the apparent power that a normal power meter would measure, while KVA is simply the maximum of the instantaneous product of volts and amps divided by 1000. The difference between these two terms is due to phase angle, which is due to the reactance of t…
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when 2phases bridge together,that is short circuit
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A garage will have a GFCI outlet. If this is what you are referring to then the refrigerator is either overloading the circuit or there is a ground fault. Sometimes equipment with motors, like a refrigerator, will cause a GFCI to trip. There may be a real problem in refrigerator causing the ground f…
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