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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 use 24 volt and not 12 volt?
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 or current pull... you could use a smaller wire and not worry about it overheating and failing. theres a lot to take in consideration for the application.
The military uses 24v systems for several reasons. One is for cranking--and when big diesels started using electric starters, those starters were all 24v. (New heavy-duty diesels use 12v starters.) Another is for the radios we used to have. The old AN/VRC-12 series radios (VRC-12, VRC-46, VRC-47 among them) had vacuum tubes in the power amplifiers--the radios were designed in the 1960s, when they didn't have transistorized final amplifiers as big as the Army wanted. Tubes need high voltage to work, and it's easier to get to 350v if you start at 24v than if you start at 12v. The current generation of radio has a transistorized amp in it. The real reason they stick with 24v is commonality: if they went to 12v systems the warehouses full of truck parts, communications gear and everything else that can be used in a vehicle would work on only part of the fleet. They don't want a situation where they issue a troop a 12v radio to install in a 24v vehicle and the radio fries, or where they issue him a 24v chemical agent alarm to install in a 12v vehicle and his whole outfit dies from the nerve gas attack the alarm didn't tell them about.
For large vehicles using a lot of power especially for cranking the engine, 24 v is used because on 12 v the connecting wires would have to be of a heavier gauge . . . copper is expensive.
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.
