I am in the US where our voltage is 120/208v or 277/480v 3 phase. In Europe the voltage is 220/380v or 240/415v 3 phase. In both cases the lower voltage is the square root of the higher voltage three phase. So in the US 120v is one phase to nuetral or ground. In Europe is 220v one phase to nuetral or ground as well, or is it two hots?
220/380 volt 50 HZ
- Thread starter Randy R
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qcroanoke
Sometimes I don't know if I'm the boxer or the bag
- Location
- Roanoke, VA.
- Occupation
- Sorta retired........
Randy R said:
It is 220 phase to neutral or ground. 380 phase to phase.
When we first started exporting buildings that was the hardest thing to make everyone understand.
chaterpilar
Senior Member
- Location
- Saudi Arabia
"In Europe is 220v one phase to nuetral or ground as well, or is it two hots?"
In Europe 220 volts is between a phase and neutral.
In Europe 220 volts is between a phase and neutral.
ron
Senior Member
- Location
- New York, 40.7514,-73.9925
As an aside:
There may be a time when we start to see 415 L-L & 240V L-N here in the US, in an effort to reduce losses in transformers at large corporate computer/data processing buildings.
Many large data centers have server power supplies that can accept a range as high as 240V L-N (take a look at your own PC too), since they are manufactured to sell in Europe too without modification.
If the output of the UPS (uninterruptible power supply) is set at 415/240V, then there is no need for the PDU (power distribution unit) transformer and an instant increase in efficiency of 2% and less floor space taken up by transformers.
There may be a time when we start to see 415 L-L & 240V L-N here in the US, in an effort to reduce losses in transformers at large corporate computer/data processing buildings.
Many large data centers have server power supplies that can accept a range as high as 240V L-N (take a look at your own PC too), since they are manufactured to sell in Europe too without modification.
If the output of the UPS (uninterruptible power supply) is set at 415/240V, then there is no need for the PDU (power distribution unit) transformer and an instant increase in efficiency of 2% and less floor space taken up by transformers.
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
In most 220v-only places, there is only a single line conductor and the grounded conductor, unless the loads are large enough to require line-to-line voltage. Thing of a single leg from a 3-phase Y system. The panel has a single breaker-stab bus.
dbuckley
Senior Member
- Location
- Canterbury, New Zealand
The 120/240 single phase / split phase thing is unique to the USA, Canada, and... I think thats it.
If you buy a European voltage UPS these days it'll be 400/230 output, as Europe is theroetically harmonized on the "Eurovolt" now. So in the UK the data centres with UPSs built in the last decade run on 230V, but if you switch the UPS to bypass the output voltage rises to 240V, as thats what the utility supplies...
If you buy a European voltage UPS these days it'll be 400/230 output, as Europe is theroetically harmonized on the "Eurovolt" now. So in the UK the data centres with UPSs built in the last decade run on 230V, but if you switch the UPS to bypass the output voltage rises to 240V, as thats what the utility supplies...
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