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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
Why is residential work so important for electricians to get right?
It is not just residential that has to be installed right, it is all electrical work that has to be installed correctly. Electricity is dangerous and can do the body a great amount of harm. It is the electrician's responsibility to do the job correctly and foremost to do it like it is stated in the electrical code book. Electrical contractors are being paid by their customers to give them a correctly installed and safe product. The majority of electrical installations are not inspected by an electrical inspector based on the contractor,s good reputation. This puts the onus on the contractor to provide a top grade installation to keep in the inspectors "good books". If you, the customer have any doubts about an installation that has been installed for you, request a meeting with your electrical contractor and the electrical inspector for your area at the site of the installation. At this time an explanation will be given to you about your concerns by the electrical inspector.
What are some common problems with a 1992 Chevy silverado 2500?
Most 2500's have no real problems. Issues are normally small. Almost all Chevy trucks have mild electrical problems. and ignitions have a tendency to break, but it does not happen to everyone, it happens on maybe 1 out of 10 trucks. I have a 1992 Chevy 1500 ext and it has 190,000 miles on it no major problems that would have totaled the truck.
i have had to replace the water pump 3 times, radiator once, AC/Heater blower once, starter and solenoid once, fuel pump once, and i need to replace the AC/Heater controller.
Mind you it might seam as if a lot of stuff was just breaking off of this truck but that is everything my family has done to that truck aside from regular fluid and filter changes. all in all it is an 18 year old truck, (my grandfather bought it a week after i was born), that has lasted a long time and we foresee it running for many more years to come. and when the time comes we will rebuild it. it is our version of a heirloom.
i hope this has some answer you need,
WM
How do you know Ryb phases when color coding is not there?
First of all, the colours red, yellow, and blue, are applied to LINES not to phases!
To determine which line is which, you must compare them with lines that are identified. This process is known as 'phasing out', and is difficult to explain without using a diagram. I suggest you check out 'phasing out' on the internet.
How much is the resistance when the function switch is set to x1?
The resistance when the function switch is set to x1 in a multimeter can vary depending on the specific model. Typically, when set to x1, the multimeter will measure resistance up to 200 ohms. Consult the user manual for your specific multimeter for more accurate information.
Wiring diagram for glow plug relay?
It is important to have a diagram for a glow plug relay. The diagram can be found in book for the specific car, or online in car forums.
Can you put a 120 v receptacle on a 240 v circuit breaker?
No, the electrical insulation rating of a 15 amp duplex receptacle is only rated at 130 volts. The 15 amp 240 volt receptacle is rated at 250 volts. The 240 volt receptacle also has a tandem pin configuration instead of the parallel configuration of the 120 volt device. The different pin configuration is so that a 120 volt electrical device can not be plugged into a 240 voltage receptacle.
What is an indication that an inadequate power supply is the source of an intermittent problem?
the power supply whines when you first turn on the system
What does the points X N L1 and L2 mean in the defrost timer?
In electrical terms X usually refers to a transformer's secondary terminal output. Example X1, X2, X3, and X4. If the timer is a clock defrost timer then the X represents a point where the timer release relay connects to.The letter N represents the neutral conductor. On controls it should be a white wire.
L1 represents a line conductor which means a "hot" wire. From L1 to N the voltage applied should be 120 volts.
L2 is a second line conductor, the voltage applied across L1 to L2 should be 240 volts.
How do you work a magic brain calculator?
A magic brain calculator operates by using mental math techniques and visualization strategies to perform calculations quickly and accurately without physical tools. Users typically practice specific methods, such as breaking numbers into smaller components or using mnemonic devices to remember formulas. The key is to strengthen cognitive abilities through regular practice, allowing for swift calculations in various scenarios. Ultimately, it's about enhancing mental agility and numerical intuition.
What is the telltale factor for ascertaining where faults in a cable lie?
Impedance.
Depending on the cable type, it may also be possible to use a device called a "reflectometer", which sends a pulse down the wire and calculates the distance based on how long it takes for the signal to bounce back. This type of device works best for coaxial type cable.
What does it mean when Back light on lancer is out?
MOST LIKELY...
when a dashboard back light is out it's usually caused by one or more burned out bulbs.
What is cos on an electric motor?
Cos phi is a European term used on a motor to differentiate between apparent power (kVA) of an inductive load as compared to the active power (kW) that is really used by the load. Cos phi= active power/apparent power.
In North America a more familiar term would be power factor. Power factor = kW/kVA
First, check the nameplate on the motor. The FLA or full load amperage is the required start up current and is typically 125-150 % higher than the running load amperage (RLA). So a current draw of 39.5 while starting would be normal for a motor drawing 25 A in run mode.
You don't need any calculations. If the stated RLA is close to 25 A and you're drawing 25 A then the motor is fine. As long as you're supplying the correct full voltage required by the motor, it will operate at "full capacity". There are numerous formulas for motors. I would need to know the motor's horsepower, voltage, whether it's single or three phase and its stated efficiency (EFF on the nameplate), the FLA and RLA to tell you if the motor is running properly or if it's going bad.
How do you calculate current in Star Delta for 10kw 3phase 415 volts induction Electrical Motor?
Since watts = volts times amps times 1.73 times power factor (for a three phase motor): W = E * I * 1.73 * PF Solving for I: I = W / (E * 1.73 * PF) Lets say your motor has a PF of 0.85: I = 10000 / (415 * 1.73 * 0.85) I = 16.39A If this is for your homework (I hope not) and PF is not given, then you will substitute 1.0 for the PF and, of course, arrive at a different answer!
Use of symmetrical component in fault studies?
Symmetrical components are used to model faults on unbalanced high-voltage transmission/distribution systems, in order to predict the magnitude of fault currents resulting from various types of short-circuit fault, so that appropriate settings can then be applied to protective systems.
The basic principle behind the method of symmetrical components is that any unbalanced three-phase phasor diagram can be represented by three balanced phasor diagrams, called 'symmetrical components', termed:
- positive phase-sequence diagram (displaced by 120o)
- negative phase-sequence diagram (displaced by 120o)
- zero phase-sequence diagram (in phase)
This enables the electrical system to be represented by three sets of balanced phasor diagrams, rather than by a (terribly complicated!) unbalanced phasor diagram. This, in turn, allows the line fault impedances to be calculated relatively simply -these are represented by Z1, Z2, and Z0 -where Z0 represents an impedance path associated with earth faults.
Further explanation of this topic is well beyond the scope of this answer, and an appropriate textbook should be consulted.
Can a 130W fan be installed into a 120V outlet?
Yes, a 130 watt fan can be plugged into a 120 volt receptacle. The current draw will be I = W/E, Amps = Watts/Volts = 130/120 = 1.08 amps.
Separate source transformer testing?
During maintenance following test to be done :
transformer oil test
ht / lv side insulation test also hv to lt
oil temperature trip / alarm
winding temperature trip / alarm
bukkhoze relay trip / alarm
PRV setting to ok
MOG trip / alarm etc.
What is the minimum acceptable reading for magger test for 480v motor?
if check voltage is 2000v then acceptable range is 400
What will happen if electricity turned off for two weeks?
The effects of not having electricity for a few weeks depends largely on the weather. In a humid climate during the rainy season, you may find that the drywall becomes damp and, later, mold may develop. When the air conditioner comes back on, it may take awhile to dry out the home and to get the walls cool again. In a dry winter, your ceiling and other weight bearing walls may develop cracks as the wood contracts. Also, you should winterize and drain your pipes so they do not freeze and burst. Your appliances should be fine; however, if the lack of electricity causes your freezer foods to defrost without any ice crystals, you should empty and clean out the freezer and refrigerator. Wash them out and block the doors so they stay open.
Why it is necessary to have a back up power generator for a supercomputer?
There are two ways to run with this;
- Depending on the size of the "supercomputer" I would think that it would have its own designated UPS
- A "power generator " would be of little use, because by the time it had kicked in, you would be in dire trouble.
If I was installing a server room and a client asked me as part of the Project can you install something that will save my data in the event of power failure, I would advise a UPS.
The size of the UPS would depend on the size of the computer to be protected.
Why doesn't a shunt motor operate on a single phase AC supply?
Shunt motors do operate on single phase AC. There are millions, if not billions of them worldwide running right now.
Make certain your voltage supply is correct for your motor. Also, make certain you're providing the proper amperage. Make sure it's not a three phase motor. (three phase motors won't operate on single phase power.) If your supply voltage and amp supply is correct and the motor still doesn't run, you've got a bad motor.
What happens if you change over too soon from star to delta?
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 systems, which offer soft-starts in DELTA configuration, are now replacing the use of manual or semi-automatic star-delta starters.
The Star/Delta starter requires a six terminal motor that is normally delta-connected direct to the 3-phase service lines. The Star Delta starter employs three contactors to initially start the motor in a star connection, then after a period of time, to reconnect the motor to the supply in a delta connection.
If there is insufficient torque available while connected in star, the motor can only accelerate to partial speed. When the timer operates (set normally from 5-10 seconds), the motor is disconnected from the supply and then reconnected in Delta resulting in full voltage start currents and torque.
The transition from star connection to delta connection requires that the current flow through the motor is interrupted. This is termed "Open Transition Switching" and with an induction motor operating at partial speed (or full load speed), there is a large current and torque transient produced at the point of reconnection. This transient is far worse than any produced by the DOL starter and can cause severe damage to equipment and the supply.
If there is insufficient torque produced by the motor in star, there is no way to accelerate the load to full speed without switching to delta and causing those severe current and torque transients. These must be allowed-for in the design of the motor and its starting system if they are to have an economic useful life.
Technical explanation
When the windings of a 3-phase motor are connected in STAR:
- the voltage applied to each winding is reduced to only (1 /.'/'3) [1 divided by root three] of the voltage applied to the winding when it is connected directly across two incoming power service line phases in DELTA.
- the current per winding is reduced to only (1 /.'/'3) [1 divided by root three] of the normal running current taken when it is connected in DELTA.
- so, because of the power law V [in volts] x I [in amps] = P [in watts],
the total output power when the motor is connected in STAR is:
PS = (1 /.'/'3 VL) x (1 /.'/'3 ID) = 1/3 [one third] PD
where VL is the phase line voltage
ID is the line current drawn in DELTA
PS is the total power the motor can produce when running in STAR
PD is the total power it can produce when running in DELTA.
- a further disadvantage when the motor is connected in STAR is that its total output torque is only 1/3 of the total torque it can produce when running in DELTA.
For more information please see the answers to the Related Questions shown below.
