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Electrical Wiring
Ask questions here about proper wiring and electrical installation here.
4,935 Questions
-600% of that if you get struck once only your grave will be struck again
What is a biomass power station?
Corn A biomass power station makes electricity from biomass fuel. Bio- means biological, as in living things. Biomass fuels are everywhere. Waste wood, walnut shells, landfill gasses, crops grown specifically for fuel, animal wastes, the list goes on and on. Examples would be a plant that burns waste wood chips to power a boiler that runs a steam turbine-generator, or methane gas from decaying matter in a landfill used to run a gas-turbine generator. Biofuels are also sometimes co-fired with coal to lower the emissions of a coal-fired plant.
How you build a fire detecter?
Actually they are smoke detectors, they detect the result of the fire, smoke. A smoke detector works as follows: There is a chamber with a small nuclear source in it. Smoke particles are hit by the radiation and are ionized, ie, an electron is knocked off the particle leaving the particle with a charge on it. The chamber has two parallel plates in it with a voltage across the plates. The ionized particles are attracted to one of the plates, causing an electric current to flow. This current is amplified and detected and sets off the alarm.
Why one phase shows 0 Amps while a delta connected 3 phase induction motor runs?
Cause 2 phase is applied to the motor and another phase is disconnected ... in this condition ur motor cannot run longer ,it will trip on over current or burn ur motor winding .
Can I wire a 3 phase delta wiring l1 l2 l3 wrong?
When it comes to electrical wiring all connections can be wired wrong. This is when an electrician is called to correct the mistake.
What is steel tape armored cable?
Armored cable that has a inbedded tape that is used for grounding purposes.
The steel tape is wrapped around the inner conductors which carry the load current. A heavy rubber coating is applied over the steel tape layer. The steel and heavy rubber helps protect the cable from physical damage, e.g. by someone digging in the ground where the cable is buried.
It is a type of plug/receptacle. Once you insert the plug, you can twist the plug to lock it in the receptacle.
Why an alternator do not operating near the knee of its saturation curve?
Efficiency drops off rapidly as you approach the knee of the saturation curve as energy is converted to heat rather than electricity.
You can apply a lower-than-rated voltage to the primary winding of a transformer, and the secondary winding will then alter by the same proportion. So, for example, for a step-down transformer, if a 230-V primary voltage results in, say, a 115-V secondary voltage, then applying a 50-V primary voltage will result in a 25-V secondary voltage.
What is the most typical industrial three-phase voltage in the United States?
The most typical industrial three phase voltage in the United States is 480volts. In Canada it is 600 volts.
A rather strange question, as most transformers are installed by trained individuals who wouldn't be using this forum for help. However, it will be necessary to refer to the manufacturer's specifications for that specific transformer in order to determine how to achieve the desired output.
How many 120VAC single-phase output receptacles does a 25kW Power Distribution panel have?
If you are referring to the 25KW Power Distribution Panel used by the military, NSN: 6110-01-244-3209, there are four 120VAC, 20A circuit breakers and four corresponding twist lock receptacles.
Is 4 kv and 30 ma be lethal from dry hand to hand?
30 ma will not hurt you but 4 kv or 4000 volts will certainly kill you for it will push far more than 30 ma through your body-wet or dry!
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Taking any amount of AC voltage from hand to hand is dangerous. This is because the path the voltage takes is across the chest in the location of your heart. Small voltages can stop the heart from beating.
Milliamps are dangerous and will hurt you as shown below;
Less than 1/2 milliamp no sensation
1/2 to 2 milliamps Threshold of perception
2 to 10 milliamps muscular contraction
5 to 25 milliamps painful shock (may not be able to let go)
Over 25 milliamps Could be violent muscular contraction
50 to 100 milliamps Ventricular fibrillation
over 100 paralysis of breathing.
How do you become an electrical repairman?
Usually by reading, learning, and hiring on as an apprentice for a electrical company. When you are a electrical journeyman, you make much more money than becoming a journeyman vehicle repair mechanic. I am a master mechanic and should have been an electrician or doctor.
Explain the Importance of electricity in hotels?
If there was no electricity in the hotels around the world, the tourist trade would collapse. People do not want to be shown their room by kerosene lamp or by candlelight. Air conditioning is a big factor on where people stay. There would be no question on where a person would stay if there was a choice to be made between an air conditioned hotel and one without air conditioning.
=== === This answer assumes the wire is properly insulated along its length so that it does not have any shorted turns if it is wrapped around a core made of a good insulator such as wood or plastic. Whether or not it is wound into a coil the resistance of a piece of copper wire depends on how long and thin it is. The thinner and longer the wire, the higher the resistance it will have and the less current it will draw from the power source.
A very short piece of thick wire will have such a low resistance it will take so much current that it will behave just like a short circuit. (Whether it is insulated or coiled even a little bit will make no difference.)
If a sufficiently long length of insulated wire is made into a coil it will act as an inductor. If it is wound around a cardboard or wooden core containing a piece of iron, the iron would make the coil have a much higher inductance than for just air.
How much voltage can be plugged into a rooftop unit with a GFCI outlet?
read the manufacturer's nameplate on the unit.
AC stands for alternating current and means that the current changes directions, flipping repeatedly from positive to negative and back again.
DC means direct current, the current only flows in one direction and does not change polarity.
What are the advantages of three phase to two phase electric power distribution systems?
Polyphase systems are used because they allow the efficient transmission of electric power, in terms of power transmitted per kilogram of wire.
Polyphase systems with more than three phases are very uncommon.
What is the minimum graphics card for full Perfect World graphics?
I have some good Graphics cards for you and the best deals to find them. Well there are graphics cards that are called to be in the 9 series for nvidia, which is the company that makes them. The best one in the 9 series is the 9800 which 99% likely to be able to take these graphics on full. You can go to nvidia.com and look at their graphics cards and see some specs that say how much memory they have and that stuff. And there is also the 8 series which has a card called the 8800 which I'm not sure if it'll run those graphics on full, but they'll definitely be high. For further information, contact Logan@tiger.tv who works for a computer company or go to their website at tigerdirect.com
Reverse motor for phase three?
To reverse the direction of a three-phase motor, you can swap any two of the three motor leads. This will change the direction of the magnetic field created by the motor and cause it to rotate in the opposite direction. Be sure to follow proper safety precautions and consult the motor's manual before making any changes.
Why might the amount of current and voltage in a circuit need to be balanced?
It is not so much the voltage that has to be watched but the amperage. On a split phase secondary 120/240 volts or a neutral of a three phase wye connection 120/208 volts the neutral carries the unbalanced current from the connected loads.
To keep this unbalanced current down to a minimum the load breakers have to be shifted around in the distribution panel. The object is to balance the connected loads so that the neutral will carry minimum load. Depending on where in the distribution panel the breakers are positioned will result in what the current on the panels neutral will draw.
The general procedure for electricians is to place a clamp on amp meter on the distribution panels neutral and write down what the amperage draw is on a fully loaded distribution panel.
Then take readings on the individual loads of the circuit amperages and mark them down on a piece of paper.
Once all of the loads have been read try and put the closest load amperages across from one another.
Once all of the balancing has been done use the amp meter on the panels main neutral conductor and see how much lower the reading is now as to what it was at the beginning of the exercise.
This is known in the electrical trade as balancing the distribution panel.
With this in mind the electrical code book allows for the use of reduced neutral conductor sizing as compared to the size needed for the main feeder conductors. This in turn reduces the installation costs of a service distribution system
On reduced neutral distributions, this is why the amperage is to be kept to the lowest possible rating so as not to overload the smaller conductor size used for the distribution's neutral.
What is the line current of a 3 phase 63kw 277 480 vac trasformer?
If the load is balanced across all three phases, and the power factor is 1.0, the line current would be about 76 amps at full load. For a more typical power factor of 0.85, the current would be closer to 89 amps.
What is the difference between a 54AS139 and a 74As139 integrated circuit?
The 54 series are military specification versions with a greater operating temperature range.
