I have 3 phase 240V, 200A service.  What will I need to convert that to 400A +  service (I understand that a standard 3 phase meter is only good for a maximum of 200A).  Also is there a way (other than a transformer) to change my 240 3 phase to 208 3 phase (120, 208, 120 - 120, 120, 120).
207445
You must understand power in = power out.\nSo the P(in) = 200A * 240V = 48000Watts \nTherefore, to obtain 400A out put you will sacrifice the voltage which will = 48000/400 = 120V\nYou need a heavy duty Transformer which will handle the 400A. The wiring size is 500MCM wire. Which is usually bus bar in a cabinet.\n\nTypically 240V 3phase line to line on a delta-wye Xfmr can provide 208V line-line provides 120V line-neutral. (208/sqrt3)\n \nUnless you have a Xfmr to convert, another way would be to use an active inverter, IGBT controlled.
171951
a ditisbution transformer is much larger . but they both do the same job .they either step up or step down current.
43893
High voltage transmission lines have three line (sometimes two sets of three lines) because they supply three-phase electicity.  The high voltage is reduced in transformers to supply houses.  Houses usually receive power from two of the three phases and the loads on the three phases must be balanced say within a given neighborhood.  Any one phase to ground will supply 110V AC for example to light a light bulb.  The two phases supply 220V AC for clothes dryers and electric ranges and perhaps a central A/C system.  A machine shop with large motors would use all three phases which supply 440V AV.\n\nElectricity can often be compared with the flow of water where pressure is like voltage and current is like flow rate.  For the original old DC electric systems, the generator was like a pump that pushed water through a single line passing it through a light bulb and into the water table (ground).  For a single phase AC system the generator is like a pump the pushes a spurt of water to the house through the light bulb into the ground than sucks a spurt in the reverse direction back to the pump, 60 times a second.  A three phase system is like having three separate water piston pumps on the same shaft that discharge one after the other into three separate lines at 60 spurt cycles a second each.  Obviously the power will depend on the pressure (voltage) and the number of phases (lines) connected to a load.  In addition to the three wires in a three-phase system, there is also a forth wire that ensures a very good connection with the ground (a ground wire).  Both the generator and the house system must be well grounded.  Hope that helps a little.  BTW, a high voltage system often has a fourth wire on top for lightning strikes.
54724
Very simple....buy the same size and model as the old one, turn off the power/gas to the old one. Disconnect the old one from water/electric lines, and take it out. re connect the new one exactly as the old one was. Turn on power/gas.....if it is gas, light the pilot. Voila! you are now a master plumber and saved yourself a bundle. You will be surprised at how easy it is.
188925
As you must be aware, the voltage on an AC line varies sinusiodally with time. ( it goes from 110v to -110v 60 times a second for a standard wall outlet in the US ). that is why it is called Alternating Current.\nhttp://en.wikipedia.org/wiki/Image:Sine_wave.png\n\nA single AC voltage line and a ground line together are a single phase supply. simple.\n\nNow if you take three cables, with voltages varying over them sinusiodally, you have 3 phase supply :). wish it were that simple though. \n\nnow all three sinusoids will reach their peaks simultaneously, and zeroes simustaneously. the instantaneous power on all the lines would be zero at that point. you can avoid this (and is practically more useful to do so) by staggering these sinusoids, so that they reach 0 at different times. the time by which you stagger them is called the phase difference. the standard is to stagger them by 120 degrees as shown here\nhttp://en.wikipedia.org/wiki/Image:Three_phase_voltages.png\n\nthere you are. hope that is cleared up for you :)
464521
First, what is the input voltage and the desired output voltage?  Is the output voltage fixed, or do you need a range of adjustment (taps)?  Do you need isolation between the input and the output?  If not, an autotransformer (single winding) might be acceptable.  What is the frequency, and is it single phase, three phase Y, or three phase delta?\n\nNext, what is the power rating?  Small transformers are usually rated in output current, whereas larger transformers are rated in KVA.  This is the maximum load;  a smaller load would not be a problem.\n\nFinally, what are the mechanical factors?  Does it need to be hermetic or can it be open frame?  Do you want terminals or wire leads?  What shape and size?  What is the mounting?\n\nIt's not really that hard.  Usually you can browse through a catalog and find the transformer you need in minutes.
461087
It is in the design of the motor, number of windings, placement and orientation of magnets, etc that sets its voltage.  If you plugged in your 240 motor to 110 in the US it will turn much more slowly, draw a lot more current and burn up quite quickly.  \n\nIf it is a small motor you could get a step-up, or step-down (depends on which way you are going) transformer.  These transformers get pretty large for any device that pulls much current.\n\nA problem you cannot overcome is the 60Hz of the US vs the 50Hz of the UK, so even if the voltage is corrected you still have the incorrect frequency which will make things like tape recorders and VCRs work improperly.  \n\nBest bet is to buy a device that is designed to work everywhere or one specific to the country where you are going to use it.\n\nMike
473056
First thing to do: with no power applied, check continuity through the magnetic chuck with an ohm meter.  If there is no continuity between the power leads, there is a broken electrical connection that needs fixing.  There should be no continuity to ground.\n\nSecond thing to do:  check the nameplate electrical rating to make sure you're applying the correct voltage (110VAC, single phase).  If the nameplate requires a different voltage, apply that.  If no nameplate, you might want to check out the Rockwell website (if it is a Rockwell component; I suspect it isn't, probably aftermarket so check out their website).\n\nOne of the things to consider is that while the magnet might be able to operate on AC, the actual electrical current going through the chuck coils may be DC, so you need to rectify the current somehow.  I'd look for some diodes or rectifiers inside the chuck and check those for proper operation - if they failed there would be no magnetic chucking even if you had it plugged into the wall.  Failed diodes will fail the continuity test in step one.\n\nYou probably have to remove the chuck to take it apart; you'd only do this if it failed the continuity check because you'll need to regrind the surface of the chuck after reinstalling to make the chuck surface parallel.\n\nThe other possibility is that external DC current needs to be supplied through some power supply that you don't have; this is where the nameplate comes in handy telling you if you need DC or AC current.\n\nI would think you'd need an electrical current limiting device on the input side to the chuck (like a transformer) rather than running AC from the wall straight into the chuck - too much current would blow the circuit breaker or cause a fire.  Be careful!
373322
For three phase AC powered loads, three separate power lines provide power to the load. The voltage waveforms on these three lines differ only in their timing, or phase relationship. A fourth wire may provide a neutral connection to the load. In the case of balanced loads, where the current in each of the three phases is equal, the current in the neutral wire will be zero. The neutral wire may therefore be eliminated, as it is not necessary for the purpose of carrying current. The vector sum of the currents drawn from the three phase lines will be zero with a balanced load. A non-zero sum of the current indicates an unbalanced load and that a current is returning to the generator, or current source, via an unintended path. This is the ground fault current.\n\nThe ground fault current for a three-phase system, without neutral, may be measured by performing a vector summation of the phase currents. This summation may be performed by a current sensing transformer with the phase currents passing through the common aperture in parallel. The magnetic field induced in the transformer core is then the vector sum of the three individual phase currents and the voltage induced in the secondary winding placed on the transformer provides a signal representing the vector sum of the currents, the ground fault current.\n\nThe electrical characteristics of ground faults in solidly grounded WYE systems allow for simple detection of ground currents by monitoring the phase and neutral currents for a simple unbalance in those currents. The principle is that the current going to the load on the normal phase and neutral conductors should return via those same conductors. Any missing current is deemed a fault to ground on the load side of the detector and, when that unbalance exceeds a set threshold, a ground fault is determined. The basic ways of measuring this unbalance for solidly grounded four-wire systems use one ground sensor surrounding the phase and neutral conductors, four individual current transformers connected in a WYE configuration, or four voltage sources connected in a delta configuration.
229619
Basically.... it is as simple as (Voltage X (times) amperage = Wattage) example.... \n\na 120volt motor pulling a normal 3 amperes  ....will consume 360 watts of electricity... \n\nThe more amperage the motor requires.... the higher... the horsepower... and also the cost to run or operate it...
225056
I seriously doubt you have a 50 HP motor!  That is industrial size, and I wouldn't expect a question like that here.\n\nWhat voltage?  A 3-phase 50HP 230V motor is 130 amps!  There is no single-phase motor that big.  If you really have this, get an electrician to install it.
338677
because it's not referenced to ground to begin with.\nbut if you have a wye to delta transformer then the wye transformer will be referenced to ground (center tap).\n\nDelta transformers are for more of the industrial (large 3 phase motors) application anyway.  hence there really is no need to reference it to ground.
294297
Operating 60Hz appliances at 50Hz or viceversa may result in excessive heat buildup in transformers or in certain types of electric motors. \nIf you wish to safely operate 115V 60Hz appliances at 115V 50Hz then the following steps can be attempted: \n\nContact the manufacturer of the appliance. It may be possible to safely operate at 50Hz with the manufacturer's approval. \n\nSee if an alternate 240V 50Hz or 115V 50Hz power supply or electrical motor is available. Some manufacturers sell the same appliance or electric tool in many countries around the world and may be able to retrofit the power supply or electrical motor to 240V 50Hz. Some regions of Japan have 100V 50Hz supplies while others have 100V 60Hz supplies so it is not uncommon for Japanese manufactured electrical devices to have 50Hz solutions. \n\nIt is possible to purchase 60Hz sine wave power systems that take 240V 50Hz on input and produce 115V 60Hz on output. These solutions are generally very expensive, and it is usually more cost effective just to replace the tool or appliance. See here for a high current frequency conversion solution. \nIf these solutions, for one reason or another, do not work then there are only two further choices: dispose of the appliance or tool, or attempt to operate the appliance or tool at 50Hz and in the process potentially create a situation where the power supply or the motors in the appliance or tool are rendered non-operational.
574821
look on the back, by your power plug. there should be a little (usually red) switch, and it should say 110 volts (or is it 115? i'm sorry, i can't read the thing on my computer because it is partially covered. oh well, it's 1-1-something!) anyhow, sometimes this switch gets flipped to 200-something (220/240?) this voltage can cause odd behaviour and also damage your computer (be careful, data loss is possible!!!) if it is switched to the wrong voltage. the 110 is for US use (i am assuming youa re in the US) so make sure it's set to that. good luck! =D
274850
It depends on the location of the transmission lines. The electrical power is usually brought to domestic consumers  at 11 kv or 11,000 volts and the same is brought down to 440 volts by transformers, for three phase distribution lines. To bigger industrial installations, the power may brought at 33 kilo volts also.  From generating power stations, the electricity is sometimes transported by upping it even to 400 kv sometimes. Higher voltage means lower current for the same power to be transported with a given cable which will cause less resistive heating i.e. less power loss in the transmission cables.
180885
First determine size of AC needed for the room based on room size and occupants. If the room is expected to have several people, a meeting room for example a larger BTU capacity maybe needed.\n\nThe manufacturer of the AC will have the Power (watts) and Current (amps) for the given line voltage.\nKeep in mind that a larger AC unit may require 220VAC vs the typical 120VAC.\n\nThe power is the same for both, but the Current is about half for the 220VAC unit vs the 120VAC unit. The 220VAC unit is more reliable. But not all rooms have the 220VAC service, which could require a new branch circuit to be installed.\n\n1000 BTU/h is approximately 293 Watts\n \nFor BTU to Electric conversion check out the following link:
627265
8.5x1000=8500 watts.  415 volts.  W=V*A A=W/V\n\nso 8500watts/415 volts =20.48... Amps\n\nthis is the basic relationship between watts volts and amps.  I dont know if the 3 phase motor part would change that answer.