220 Volt the same?
- Thread starter Delroy
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- New Jersey
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- Journeyman Electrician
The motor won't know if one conductor is grounded or not. The differential between 220 volt and 240 volts may or may not be a problem.
LarryFine
Master Electrician Electric Contractor Richmond VA
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- Henrico County, VA
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- Electrical Contractor
I say yes, but be sure that the load's neutral is now treated as a hot wire.
gar
Senior Member
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- Ann Arbor, Michigan
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- EE
081118-2035 EST
If this motor is really rated 220 line to neutral, then that means its rating should be 220*1.732 = 381 V line to line. If you float the motor neutral and apply 240 V line to line it will not run well. This is way under voltage for the motor.
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If this motor is really rated 220 line to neutral, then that means its rating should be 220*1.732 = 381 V line to line. If you float the motor neutral and apply 240 V line to line it will not run well. This is way under voltage for the motor.
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wirenut1980
Senior Member
- Location
- Plainfield, IN
Keep in mind the voltage will not always be 240 V exactly. If the voltage runs high, the motor could get damaged.
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Actually, for most motor types, a within-10% overvoltage will run with a bit less current and a tad cooler.
Standard disclaimer: All other things being equal, of course.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
broadgage
Senior Member
- Location
- London, England
Electric motors must be supplied with about the correct voltage, often +/- 10%, they dont "know" which, if any, circuit conductor is grounded.
Single phase two wire motors are produced in various voltage to suit the supply in different countries, they must be used on at least roughly the correct voltage. 220 volt and 240 volt are interchangeable for all but the most critical applications.
Three phase three wire motors are also made in different voltages to suit different markets, and again must be used on at least roughly the right voltage.
Three phase motors with 6 or more wires can be configured for different voltages, and must be connected internaly for the correct supply.
Frequency is also important, and in theory motors should be used on the correct frequency, though for small motors in non critical applications it often does not matter that much.
A 50 cycle unit worked on 60 cycles will run faster and produce more HP, it might tend to overheat, but the fact that the internal fan runs faster tends to counteract this.
A 60 cycle motor run on 50 cycles will run slower, and may draw more current with risk of overheating, though in practice the driven pump/fan/other load will absorb less HP at the lower speed, and may prevent overheating.
If the frequency is higher than intended, then a slightly higher supply voltage is generally OK.
If the frequency is lower than intended, then ideally the voltage should also be reduced.
USA type 277 volt, 60 cycle, single phase fan motors work fine on a UK 240 volt 50 cycle supply.
Single phase two wire motors are produced in various voltage to suit the supply in different countries, they must be used on at least roughly the correct voltage. 220 volt and 240 volt are interchangeable for all but the most critical applications.
Three phase three wire motors are also made in different voltages to suit different markets, and again must be used on at least roughly the right voltage.
Three phase motors with 6 or more wires can be configured for different voltages, and must be connected internaly for the correct supply.
Frequency is also important, and in theory motors should be used on the correct frequency, though for small motors in non critical applications it often does not matter that much.
A 50 cycle unit worked on 60 cycles will run faster and produce more HP, it might tend to overheat, but the fact that the internal fan runs faster tends to counteract this.
A 60 cycle motor run on 50 cycles will run slower, and may draw more current with risk of overheating, though in practice the driven pump/fan/other load will absorb less HP at the lower speed, and may prevent overheating.
If the frequency is higher than intended, then a slightly higher supply voltage is generally OK.
If the frequency is lower than intended, then ideally the voltage should also be reduced.
USA type 277 volt, 60 cycle, single phase fan motors work fine on a UK 240 volt 50 cycle supply.
gar
Senior Member
- Location
- Ann Arbor, Michigan
- Occupation
- EE
081119-0826 EST
Float the neutral by not connecting it.
I went in the direction of 3 phase because the the terminology line to neutral was used. Had it been single phase and a two wire load why would anyone care whether there was a neutral or not was my thought.
If this had been a Y connected 3 phase motor 220 V and had 6 wires, then it could be rewired as delta and used on a 240 delta source.
If the question was, I have a 220 V motor will it work on 240 V, then my thought process would have been different. Almost certainly a 220 V 60 Hz motor will work fine on 240 V 60 Hz. A 220 V 50 Hz motor will work very well on 240 V 60 Hz, but 6/5 faster
.
Float the neutral by not connecting it.
I went in the direction of 3 phase because the the terminology line to neutral was used. Had it been single phase and a two wire load why would anyone care whether there was a neutral or not was my thought.
If this had been a Y connected 3 phase motor 220 V and had 6 wires, then it could be rewired as delta and used on a 240 delta source.
If the question was, I have a 220 V motor will it work on 240 V, then my thought process would have been different. Almost certainly a 220 V 60 Hz motor will work fine on 240 V 60 Hz. A 220 V 50 Hz motor will work very well on 240 V 60 Hz, but 6/5 faster
.
If indeed this is a 3 phase the terminology "line to neutral" would really be weird. I have never seen any motor that wasn't marked with the running voltage. I would agree with the others who say the motor doesn't know any difference for line to line vs. line to neutral voltage. It operates on a voltage differential.
Is it single-phase or three-phase?
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Maybe I'm confused, but I believe he's asking if you supplied a single phase motor with two conductors with a voltage of 220 volts between them would it make any difference if one of those conductors were grounded. If that's the question then the answer is no.
220 Volt the same
220 Volt the same
You can. The motor is designed to be connected to a voltage differece of 220 Volt; whether you connect this to a L & N source or a Line to Line source. But when you operate a motor higher than the rated votage the line current increase. here about 9% more than the 220V. Normally all motor can work with plus or minus of the rated voltage, this is agreeable. But if the 240 V is the nominal votage and consider the expected increase of further 10% in the supply voltage, this voltage becomes 264V and your motor is actually rated for 220V which can withstand upto a maximum 242V.
Always better to select the equipment with the available supply voltage.
Otherwise, apart from the overcurrent and other characteristics will also change; and the life cycle of the motor reduces.
220 Volt the same
You can. The motor is designed to be connected to a voltage differece of 220 Volt; whether you connect this to a L & N source or a Line to Line source. But when you operate a motor higher than the rated votage the line current increase. here about 9% more than the 220V. Normally all motor can work with plus or minus of the rated voltage, this is agreeable. But if the 240 V is the nominal votage and consider the expected increase of further 10% in the supply voltage, this voltage becomes 264V and your motor is actually rated for 220V which can withstand upto a maximum 242V.
Always better to select the equipment with the available supply voltage.
Otherwise, apart from the overcurrent and other characteristics will also change; and the life cycle of the motor reduces.
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