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Electrical Wiring
Ask questions here about proper wiring and electrical installation here.
4,935 Questions
Examples For parallel circuit?
For electrical systems: the electrons have two possible routes, through one pipe or through the other.
Think of draining a barrel: with one hole it takes time. Making another hole now the water can float through two parallel ports.
Serial would mean: first through one, then through the other. Like connecting not two hoses next to each other, but behind each other: water now first has to go through hose #1, then through hose #2. This is less easy than just through one.
With resistors this would mean: in parallel the total resistance of the two resistors is lower than the lowest of the two. With serial the total resistance is higher than the highest two.
A bit like tourniquettes: two next each other can work double as much people: they work in parallel.
With two tourniquettes behind each other people are slowed down even more.
With kind regards,
Henk
Salada is a Spanish word which means witty, sharp or funny. It also refers to someone who is annoying or a person who is unbearable.
What size capacitor is used for a 3 ton 208230 vlt single phase AC compressor?
You can not get a good answer for this. There are different capacitors for some compressors. Your best advice would be to search the web using the compressor model number and get the manufacturer's recommendation. If that is not avalible then try this. Most compressors of this size use 55MFD. If the unit has a start and run capacitor then, then the run gets down to 50MFD. Most High efficiency dual cap compressors are 45MFD. Some high efficiency dual capacitor units can go as low as 40MFD but that is rare. All of these run capacitors should be 370V or greater.
A #3 copper wire with an insulation rating of 75 or 90 degrees C is rated at 100 and 110 amps consecutively.
What is the difference between MCB and MCCB?
- MCB (Miniature Circuit Breaker)-rated current not more than 100 A. Trip characteristics normally not adjustable. Thermal or thermal-magnetic operation. Breakers illustrated above are in this category.
- MCCB (Molded Case Circuit Breaker)-rated current up to 2500 A. Thermal or thermal-magnetic operation. Trip current may be adjustable in larger ratings.
- MCB (Miniature Circuit Breaker)-rated current not more than 100 A. Trip characteristics normally not adjustable. Thermal or thermal-magnetic operation. Breakers illustrated above are in this category.
- MCCB (Molded Case Circuit Breaker)-rated current up to 2500 A. Thermal or thermal-magnetic operation. Trip current may be adjustable in larger ratings.
from Manu anand
What amp supply would power a 240 volt air compressor?
Read the label on the air compressor or its User Manual. Find what power it takes in Watts and divide the power by the Voltage (240 volts in this case.) The result is the basic current drawn in amps. But that is not enough information to decide what size circuit breakers and wiring should be installed. The answer will depend on length of cable run required from breaker panel to wall outlet and the Wiring Codes or Regulations for your locality. (Town/State.) If you don't know how to calculate these, call a licensed electrican to advise you or do job for you. IF YOU ARE 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 power at 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.
Kilowatt hours of electricity needed to produce 1kg of hydrogen?
1 watt is a unit of power (energy/time used) therefore 1 watt = 1 joule of Energy/second.
Kilowatt-hours are energies calculated from (1000 joules/sec)x3600 seconds of an hour time=3.6 million joules = 3.6 Megajoules of Energy to be delivered to produce, for instance, hydrogen.
To decompose 1 mole of water, 0.018 Kg. of water, you need to supply an amount of charge of 96,500 coulombs, giving 0.016 Kg. of Oxygen ans 0.002 Kg. of hydrogen.
You need then to provide 500 times 96,500 coulombs to get 1 Kg of hydrogen , (notice that 1,000/0.002 = 500). Notice that 500 =1,000/2.
You require then (1,000/2) times 96,500 coulombs of charge in order to be able to get 1 Kg of Hydrogen from ENOUGH water at your vessel. That is, (1,000/2) times 96,500 coulombs = 96.5 /2 Megacoulombs, because Mega in Greek is equivalent to Million in English.
You need then 48.25 Megacoulombs of charge, because 96.5/2 =48.25 if you are going to recuperate 1 Kg. of gas hydrogen . These charges represent an amount of electrical energy , to be measured in joules of energy, you have to provide to do your wish.
-19
Each carge represents as an entity storing 1.6 times 10 coulombs. 1 mole
23 -19
equivalent of electrons represents 6.06 times 10 times (1.6 times 10 coulombs)
4
or about slightly more than 9.6 times 10 coulombs = 0.0096 Megacoulombs
(Will continue, dated 15 October 2009).
Can you make electricity by rubbing two batteries?
There is a way of getting a but more power out of almost dead battery's and that is by rubbing them the friction warms them up and gets a bit more out of them. you can do this with 1 battery as well.
No. You must keep a separate thermostat for each air conditioning unit even if the two thermostats have been physically installed side-by-side.
The reason is very simple to understand: a thermostat is, very roughly, a bit like the cruise control in a car. When the speed drops from the set speed the cruise control gives the engine some more gas until it senses that the car's speed is fast enough and then it reduces the gas supply to the engine to maintain the set speed. No car engine can share the same cruise control with another engine. It is exactly the same for two air conditioning units - they each need to have their own thermostat.
Now this particular question itself raises yet another question: Why has the installer placed both thermostats alongside each other? That is not good practice at all!
The installer was either "cutting corners" - to save having to do some extra wiring for each separate thermostat - or was plain incompetent.
To ensure that a particular air conditoner is controlled correctly its thermostat must be installed somewhere within the "zone of cooling" for that air conditioner.
You should have been asked which areas you want to be controlled the closest. If you chose say the main bedroom for Zone A and the living room for Zone B, that is where the thermostats for each air conditioner should have been placed. But, as they have been installed side-by-side, if they are both set to the same temperature then the zone furthest away from the thermostats may never be cooled enough or may be over-cooled, whilst the zone closest to the thermostats may be controlled ok.
To understand the reason why that would be true, let's consider what would result if each thermostat were set to a different temperature: it is obvious that the thermostat set to the cooler temperature will keep its ac unit running long after the thermostat set to the higher temperature has turned off its own ac unit.
The resulting overall effect depends on which of the two zones is set to be cooler: * If the "set-to-be-cooler" zone is the zone closest to the position of the two thermostats then that zone will be controlled ok but the more distant "set-to-be-warmer" zone may never get any air conditioning!
That more distant zone could just heat up to the temperature of the outside air because its "own" thermostat is telling it that the air around it (meaning the thermostat, not the ac unit!) is cool enough already...
* If the "set-to-be-cooler" zone is the zone furthestfrom the position of the two thermostats then that zone will, again, never be controlled properly because the ac unit in the nearer "set-to-be-warmer" zone will always turn off its ac unit to maintain a temperature that is warmer than the other, more distant zone requires.
So, again, that more distant zone will always get too much cooling because its "own" thermostat is telling it that the air around it (meaning the thermostat, not the ac unit!) is not warm enough yet!
In a parallel in a electrical curcuit what happens when the current reachs a fork?
The current divides itself according to the resistance of each fork. If the resistance is equal, half the total current flows in each leg. The current flowing into the fork always equals the total current flowing into each of the legs.
A megger is an electrical instrument that is used to measure the resistance of insulation by applying a DC voltage to the conductor. One lead is connected to the conductor and the other lead is connected to ground. Safe insulation reading to ground should be above 2,000,000 ohms or 2 megs.
What does hydroelectricity look like?
Hydroelectricity usually refers to generating electricity by harnessing the force of running water, so if it looks like anything it's huge dams. But the actual eceltricity is just like any other.
Simple definition of electronic signal?
The simple definition of an electronic signal is a mode of communication that is generated through electric means. This refers to an electric current that is passed in an electromagnetic field.
What would cause an electric motor to run backwards?
Motors running backwards:
A DC motor wired backwards or magnetic field reversed.
A 3 phase AC motor with 2 phases reversed
A single phase motor will run either way unless it is 'persuaded' by means of a shaded pole or other method to rotate in a particular direction.
How do you determine the ground wire size for a single phase 400 amp service?
I assume we are talking about 120/240V service somewhere in the US, and that you are using copper wire! You must consult the NEC (National Electric Code) or other code your municipality uses. It must be the year of issue that your municipality has adopted AS AMMENDED by that municipality. Many cities do not adopt the codes as-is, they change things here and there. Get a copy, or hire someone who knows this stuff. Using the plain 2005 NEC, I would go to article 230 - Services. It tells me the size of the grounded conductor depends on the size of the ungrounded service entrance conductors, so I have to know that first. 230.42A tells me the ungrounded conductors are sized according to 310.15, so I go to article 310, Conductors and look at table 310.15(B)(C). It says your 400 Amp service will use 400 kcmil wire for the ungrounded conductors. Back to article 230. Paragraph 230.42C says to size the grounded conductor according to 250.24C, so I turn over to article 250, Grounding. 250.24C sends me to table 250.66. Table 250.66 says that for service entrance conductors over 350 kcmil and less than 600 kcmil, the grounded conductor would be 1/0. There are a few exceptions and circumstances that could change the answer, but you get the idea. As you can see, this is not trivial, and mistakes will be costly. Hire a pro to do the calcs for you. Unless this is a homework or test question. In that case, you're welcome... <><><> If you're asking this question you shouldn't be installing an electrical service. Asking this type of question usually means you aren't ready to do this yourself. Study some electrical material and the National Electrical Code, or call a professional electrician. If someone were to give you an answer here, you might attempt to do something you shouldn't be doing, and that may cost someone a shock, a home fire, or their life. IF YOU ARE 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 power
at the breaker box/fuse panel BEFORE you attempt to do any work
AND
always use an electricians test meter having metal-tipped probes
(not a simple proximity voltage indicator)
to insure the circuit is, in fact, de-energized.
3 Phase switch board connect to switch?
"3 Phase switch board connect to switch" OK, this seems to be asking something about 3-phase electricity... "switch board " seems to be asking about a "switchboard", but that is an item normally used on telephone systems, not with 3-phase supplies or appliances. "switchboard connect to switch" makes no sense at all. Something is missing from this question! So this question does not make sense. Whoever asked this question should please log in and edit this question so that it makes sense.
Then someone else may be able to give you an answer.
If you don't add a resistor to drop the additional voltage, you run the risk of burning up the LEDs.
1/0
<<>>
This is a voltage drop question. A voltage and whether it is a single or three phase system must be provided to give an answer.
Why ac unit is blowing hot air inside the house but outside unit blows cold air?
Sounds like your system is a heat pump. When a heat pump cools in the summer, the inside coil gets cold and the outside coil gets hot. When the heat pump heats in the winter, the inside coil gets hot, and the outside coil gets cold. It sounds like your heat pump is stuck in heating mode. Check your thermostat to be sure it didn't accidentally get switched to heat. It could be the reversing valve inside the unit is stuck, or an electrical control is broken, forcing the reversing valve to stay in the heating position. Perhaps a call to the serviceman is in order!
Why does your guitar amplifier make a loud popping sound when being turned off?
It shouldn't, but if it does it's probably an older model. If it's not that old but has had alot of use, some of the capacitors might be going bad. Take it to a tech before you blow a speaker.
