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Electrical Troubleshooting
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.
885 Questions
The amperage rating of a copper wire is related to its resistance and to the type of insulation used (i.e., what temperature the insulation can handle) and the ambient temperature. The fatter the copper wire, the more amps it can handle, everything else being equal. A mineral-insulated wire, buried underground, would handle more amps than a similarly sized copper wire in thermoplastic insulation in air.
There are electrician charts available to determine the MINIMUM size of copper (or aluminum) wire necessary for a particular load.
Consider also that longer the wire, the more resistance there is, so a very long wire would need to be larger to handle the same load safely.
What is the different between ac dc motors?
DC Motor works on DC source and AC motor works on AC source
What is the difference in wiring a 12 3 phase motor at low voltage between run and start?
You have to wire both the run and start windings. The start windings will automatically be removed from the circuit once the motor is at 75% of normal speed. The start winding gives you more torque to start the motor.
Wiring diagram for 440v three phase plug?
Well that is probably a very complicated circuit. You should just look for a Inverter with 220V single phase input and 415V three phase output. It should be that hard to find.
What cable wire size for 1000 watts aircondition?
The only way to determine the cable wire size needed for a 1000 watt air conditioner is to find the load size. To get the load size you will need to use the formula Amps = Watts or Volts. With that being said, you will need a number 14 copper wire.
What to do if the voltage is to high in your house?
It is very difficult to have residential voltage that is too high. Utility companies go to great lengths to keep voltages and frequency within very close tolerances. In the US residential voltage for lighting and outlets is a nominal 115 Volts, and normally doesn't vary more than 3 to 5 volts. That won't hurt anything. The other voltage present in residential buildings is 220 Volts. That voltage is used almost exclusively for electric dryers, water heaters, and electric ranges. It is used to provide large amounts of power and still keep the size of the electrical conductor reasonable. If you had to use 115 Volts you would draw twice the amps requiring a conductor capable of twice the capacity of a conductor destined for 115 Volt use. Those are more expensive and much harder to work with. DO NOT MIX THE TWO VOLTAGES! Plugging a 115 volt device in a 220 volt circuit will probably destroy the device. Plugging a 220 volt device in a 115 volt circuit will destroy the wiring if not properly protected, and may cause a fire. All wiring used in a residential setting is rated at 600 Volts. That means that the insulation will withstand 600 volts without breaking down. Therefore you can use the wire for any application in the house PROVIDED is is the proper size for the expected current. Fixtures (Switches, Outlets etc.) are rated by voltage and current. The rating is right on the device. You may have noticed that outlets have different blade patterns. That is to prevent plugging the wrong thing in an outlet. Since appliances are rated by voltage and current (amps), or voltage and power (watts) do not plug appliances in the wrong voltage or current. The appliance manufacturer has installed the proper plug for his appliance. You must use the properly configured outlet. Building inspectors insure that the residential circuits have the correct pattern devices on each circuit. If you must replace a device make sure that the black wire goes to the gold connector, silver goes to silver connector, and green goes to green. If you are really uncomfortable with your home wiring, hire a licensed electrician to verify that everything is correct. After that you can replace any device as long as you turn the device off first and then make sure you install the new device EXACTLY as the old one was installed.
How do you calculate no load current of motor?
On an average, the following assumptions will stand good for an induction motor: * Starting current (Ist) will be 5 times of the Full Load Amps (IFLA) * No Load Amps (INLA) can be any where between 0.3 to 0.5 times of IFLA; To the most, this figure depends upon the frame size of the motor; larger the frame size, smaller will be the INLA. This is also true for the wound rotor type induction motors. Manufacturers normally give two different current figures, one for the motor running with full load, and one for 'locked rotor'. Locked rotor current is the very high current drawn when power has been applied, but the motor has not had time to start spinning. <><><> No load current is important since this portion of the energy consumed will not be reflected in the process output, for a machine which is running continuously, no one can neglect whatever low value it is. Usually, the efficiencies will be mentioned and one can apply basic thumb rules to arrive no load current from those figures <><><> Manufacturers don't usually publish 'current at no load' for their motors. Since a motor with no load is not doing anything useful, no one really cares how much current is being drawn. It's kind of like putting your car up on a jack so the wheels are off the ground and asking how much fuel will the car burn sitting still with the wheels turning at 10 miles an hour - or at 100 miles per hour - who cares? !!!
What would cause beeping sound in wall socket?
A beeping sound in a wall socket could indicate a faulty electrical connection, a short circuit, or a wiring issue. It is important to disconnect any devices plugged into the socket and contact a qualified electrician to inspect and address the problem to prevent potential safety hazards.
Why do you need more than one type of voltage line in a house?
In the USA houses would have 120/240 volts. 120 volts at most receptacles and lights and 240 volts for larger equipment like your stove, dryer, hot water heater.
What causes electrical connections to explode?
Various flammable gasses, flammable liquids, and combustible dusts can ALL explode when mixed with sufficent air, and an electrical spark creates enough heat to ignite the mixture. Examples would include hydrogen, propane, gasoline, alcohol, powdered sugar and flour.
What is the difference between KVA and KW of a transformer?
Transformer power is given by P=V*I which takes the unit of KVA while that of KW has energy term which is not produced by the transformer.It only steps up or down the voltage.
Answer:
In a pure D.C. circuit, KW = KVA. However, in any A.C. circuit, there is real power {KW} and apparent power {KVA}, due to the voltage and current being out of phase. Power Factor is the ratio of KW to KVA. Transformers are rated in both KVA and PF. Multiplying the transformer KVA rating times the PF will yield KW.
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A transformer has separate ratings for maximum voltage and maximum current. Multiply the two together and that is called the VA rating, or kVA for larger transformers. So the transformer rating is independent of the power factor of the load.
Why do you use Two Winding run and start winding in the single phase motor?
Any transformer uses a minimum of two windings to change the voltage value. The primary side of the transformer is usually connected to the existing voltage. The secondary side of the transformer is usually connected to the load, who's voltage could be higher or lower voltage than the primary voltage.
If the secondary voltage is increased the transformer is known as a step up transformer and if the secondary voltage is decreased the transformer is known as a step down transformer.
The transformer terminal markings for the primary are H1 and H2 on a single coil primary and H1 to H4 on a dual voltage primary winding. Like wise the secondary terminal markings are X1 and X2 on a single coil secondary and X1 to X4 on a dual voltage secondary winding.
What is the difference between voltage series and current series feedback amplifier?
I assume a series of amplifiers with one F/B The F/B is the portion of voltage/current F/B from input to output no matter how many amplifiers are in series within the loop or what the gain of each one is.
How can you calculate busbar size?
Busbar Length x Busbar Size x 0.009
ex- Length= 12meter
Size = 60 X 10 mm
ie, 12 x 60 x 10 x 0.009
Ans = 65 kg
Can you please let us know what is "0.009" for???
Ans: 0.009 = copper density
Max. Current for 60 x 10mm = 60 x 10 x 1.55 = 930 AMP
What is "1.55" for??
How do you test an electric bell with a megger?
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 electrical short to the frame of the device.
In the case of a bell, you would connect one lead to the metal frame of the bell and the other to either of the bell wires. The result of the test should be infinity or an open circuit.
Can a Dy11 vector group transformer be connected to a Yd1 vector group transformer source?
In series, yes. In parallel, nope!
Putting a Yd1 transformer in series with a Dy11 transformer would result in the output of the Dy11 transformer being identical to the input of the Yd1 transformer with the exception of the voltage magnitude - this will change depending on the winding ratio's on both transformers.
But, in regards to other properties of the voltage, the phases will in be in phase, with the voltage in-between the two transformers lagging by 30 degrees.
What are the Application of single phase induction motor?
Split-phase motors are used in many applications that require a medium amount of performance from a single phase source. Many of the motors used in homes that are supplied by single phase power are split-phase motors.
Some applications include running fans, blowers, water pumps, air compressors, conveyor belts, and more. The only limits on the applications that can use split-phase motors are the availability of single phase power and the charectoristics of the motor itself.
Why do you use resistors in computers?
Resistance: Electrical resistance describes how an electrical conductor (a wire) opposes the flow of an electrical current (flow of electrons). To overcome this opposition a voltage (a energy) must dropped (used) across the conductor (wire). Resistance can be described by ohms law: Ohms Law: R = V / I (Resistance = Voltage / Current) (resistance measured in ohms) where: Voltage [V]= the energy lost across an component (voltage measured in volts). Current [I] = the charge (electrons) flowing through an component (current measured in Amps). Electrical resistance can be thought of as sticking your hand out a car window. The faster [current] you drive the harder the wind presses [resistance] against you hand and therefore it takes more energy [voltage] to hold your hand steady. When trying to overcome electrical resistance, the electrical energy lost is turned into heat. This is how the elements of a household stove, toaster, and fan heater work. Because of the vacuum in a light bulb, the electrical energy lost is instead turned into light. It can be seen the electrical resistance plays a large role in modern life. Resistor: The resistor is the most common electronic component and is used to limit and/or control the voltage and current in an electronic circuit. Resistors are carefully manufactured to provide a predetermined value of electrical resistance which may range from 0.1 ohms to 100,000,000 ohms, depending on the application. The physical size of a resistor also varies dependant on the amount of power passing through the resistor, given by: P = V x I (Power = Voltage x Current) (power measured in watts) There are also many types of resistors including: · Variable Resistor - changes resistance when its shaft is rotated (volume knob on a stereo). · Thermistor - changes resistance when the temperature changes (used in a thermostat). · Light Dependant Resistor (LDR) - changes resistance when the lighting changes (used in children's night-lights). Resistor Example: An LED is a small red light (such as the one on the front of most TVs) and requires 2.0 volts and 0.02 amps to operate correctly. If we connected that LED up directly to a 12 volt battery, the voltage would be too high, and too much current would flow… the LED would blow up. We need to use a resistor to limit the voltage and current. But which value of resistance should the have resistor? Uses ohms law: R = V / I = (12.0 - 2.0) / 0.02 = 500 ohms (Note: the voltage across the resistor is the battery voltage minus the voltage we want across the LED) But which value of power should the resistor be capable of handling? P = V x I = (12.0 - 2.0) / 0.02 = 0.2 Watts
What is the difference between a galvanometer and an electric motor?
Well, both work on what is termed the 'motor principle', i.e. a current-carrying conductor, when placed in a magnetic field, is subject to a force perpendicular to that field. But that's where the similarity ends, for the operating coil in a galvanometer is restricted to move within an arc, whereas a motor's coil will continuously rotate.
How to check 220-240 volt single phase capacitor start motor if it will not start?
I'm assuming you want to check to see if the motor works.
In other words, if the motor isn't working you want to know if the motor is bad or the capacitor is bad.
Turn on power to the motor, and carefully attempt to start motor rotation in the correct direction by manually rotating the shaft or the load connected to the shaft.
If the motor will maintain its motion once you get it started, the problem is most likely a capacitor. Check the capacitors for bulging and replace any defective parts.
If the motor will not spin at all, or will not maintain any momentum, the motor is likely the problem. You can replace it or try to reduce the rotating friction by lubricating the bearings, etc.
IF YOU'RE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
If you do this work yourself, always turn off the powerat the breaker box/fuse panel BEFORE you attempt to do any work AND always use a meter or voltage indicator to insure the circuit is, in fact, de-energized.
How do you use a megger tester?
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 injured in any way to cause a short circuit when normal power is applied to it.
On some meggers there are 3 ranges 300V, 750V, and 1000 volts. Applying the proper voltage is essential to avoid damaging the device you are testing.
Working voltages up to 240 volts should use the 300 range. Working voltages up to 600 volts use the 750 volt range and working voltages above 600 use the 1000 volt range.
If you used the 1000 volt range on a device that had a working voltage of only say 24 volts, you could damage the insulation of the device just by testing it! So meggering a device is only non-destructive if you use the tester as its instructions tell you to.
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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.
Before you do any work yourself,
on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
Why is the power off on on breaker when it is not flipped off?
Turning the breaker on allows the power to flow through to the outlets, lights, and appliances on that circuit, so yes power goes to and through a turned on breaker. If the breaker is off, but the main power is on, power still get to the breaker, usually from the bus bar that runs down the middle of the back of the breaker box.
How can burn three phase ac motor?
You need to ensure that each line conductor is correctly identified. If you replace them in the wrong sequence, then the new machine will run backwards when you energise it! It may be necessary to use a phase-sequence meter to confirm the phase-rotation before restoring supply to the new motor.
<><><>
As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.
Before you do any work yourself,
on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
What is theConstruction difference between stream turbine and gas turbine?
gas turbines and gas engines are different in mechanic designes uses diffrent liquid for engine we use flemmable gas we use for turbine liquide flemmable but they need air both gas turbines and gas engines are different in mechanic designes uses diffrent liquid for engine we use flemmable gas we use for turbine liquide flemmable but they need air both answer by nailiyoucef05@yahoo.fr
I dont think so. Gas engine works as the same principle of a petrol engine. And in gas turbine gas is burned and high velocity gas is passed through the turbine.
A gas engine is an internal combustion engine and have no turbines.
alamm2@asme.org
What is importance of a polarity test?
HERE'S AN EXAMPLE:
IF THE POLARITY IS BACKWARDS AT A LIGHT FIXTURE THEN THE HOT (120VOLTS) WILL BE THE OUTSIDE OF THE LIGHT BULB SCREW SHELL AND THE MIDDLE PRONG INSIDE THE SOCKET WILL BE THE NEUTRAL -- THEREFORE WHEN YOU CHANGE THE BURNT OUT LIGHT BULB YOU WILL GET SHOCKED BECAUSE THE SCREW SHELL PART IS HOT!! IF WIRED CORRECTLY YOU WILL NOT GET SHOCKED BECAUSE THE HOT (120VOLTS) WILL BE INSIDE THE SCREW SHELL ON THE PRONG AND YOU WON'T BE TOUCHING THAT PART WHEN YOU CHANGE THE LIGHT BULB!!
