# 3 Phase 240 V

Discussion in 'General Electronics Chat' started by stephasbury, Jul 6, 2009.

1. ### stephasbury Thread Starter New Member

Jul 6, 2009
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Is it possible to have a 3 phase system and 240 volts?

2. ### GetDeviceInfo Senior Member

Jun 7, 2009
1,571
230
very common here in North America

3. ### Chris_B New Member

Jul 6, 2009
7
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Very common here in the UK too. Most medium and large premises have their 230V delivered as 3 phase and then distributed in the building as single phase 230V.

4. ### stephasbury Thread Starter New Member

Jul 6, 2009
2
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I have been looking for a piece of medical equipment that is 240V and a 3 phase system. All of them are 208V and 3 phases, I'm having no luck.

5. ### GetDeviceInfo Senior Member

Jun 7, 2009
1,571
230
Get a quote on having the 208 service pulled to where you need it. You'll almost certainly have it serviced to your building.

6. ### beenthere Retired Moderator

Apr 20, 2004
15,815
283
There is an interesting thing about 3 phase. If you have a Wye arrangement with all three phases to a common line, you have 240 volts. With a delta arrangement, you measure only 208 volts. That is because the phase angle from one to another is only 120 deg. The sine of 120 degrees times 240 volts is 207.8 volts.

Check further - you may be able to use this equipment.

7. ### eblc1388 Senior Member

Nov 28, 2008
1,542
102
A wye system(3-phase+neutral) having phase-neutral voltage of 240V is also a delta system without neutral of 415V.

The phase-phase voltage with delta connection is always 1.732 times higher than the phase-neutral voltage.

8. ### ELECTRONERD Senior Member

May 26, 2009
1,146
16
Three phase AC is a lot more efficient then single phase AC. It can provide good results over longer distances.

9. ### subtech Senior Member

Nov 21, 2006
123
5
Check your equipment ratings carefully. Many devices will work with 208 or 240V three phase.
If all else fails and you must have 240V a dry type step up transformer can be installed to give the necessary voltage. (Be warned, this may put a considerable dent in your checkbook)