Joethemechanic
Senior Member
- Location
- Hazleton Pa
- Occupation
- Electro-Mechanical Technician. Industrial machinery
Anybody under 40 is a kid to me
"Single Phase"" From a WYE
- Thread starter Joethemechanic
- Start date
gar
Senior Member
- Location
- Ann Arbor, Michigan
- Occupation
- EE
230624-159 EDT
In our area we have many open deltas. At the building where my son has his shop he is supplied with an open delta as are about 5 other businesses, all from two transformers. His load is lighting, about 5 CNC machines, a 40" wide belt sander, chop saw, two bandsaws, welders, furnaces, and two air conditioners..
From two phases of a 3 phase wye source you can create three phase with additional windings on the two transformers or with added transformers.
From a single phase center tapped transformer, two phases, you can not generate a 3 phase output with just ordinary transformers.
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In our area we have many open deltas. At the building where my son has his shop he is supplied with an open delta as are about 5 other businesses, all from two transformers. His load is lighting, about 5 CNC machines, a 40" wide belt sander, chop saw, two bandsaws, welders, furnaces, and two air conditioners..
From two phases of a 3 phase wye source you can create three phase with additional windings on the two transformers or with added transformers.
From a single phase center tapped transformer, two phases, you can not generate a 3 phase output with just ordinary transformers.
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- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
Yes.
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
I would call it "two out of three phase 120 wye". Often in apartment houses or other multiple occupancy situations the service is wye and each unit gets two out of three for 208/120 volts using a standard "single phase" panel. Which two are used is spread over the units in the building to best balance the phase loading.
- Location
- Wisconsin
- Occupation
- PE (Retired) - Power Systems
The source and usually the utility setvice drop that supplies the voltage is 3-phase 4-wire.
Your unit's supply/circuit is only 3-wires, 2 lines and 1 neutral, so the way I was tought this is single phase because there is only 1 Line-Line voltage.
This type of system is very common in apartment building, such that it is a standard offer in multi-meter centers. My area utilities called this a 'network' service.
jaggedben
Senior Member
- Location
- Northern California
- Occupation
- Solar and Energy Storage Installer
For what it's worth I've heard some utilities call it Single Phase 120/208. As far as 'does it have a name' that's probably the best you can do.
Actually teaching the kids to understand it requires more than a name anyway.
Actually teaching the kids to understand it requires more than a name anyway.
- Location
- Illinois
- Occupation
- retired electrician
Per IEEE, when the lower voltage is shown first, it is single phase and when the higher voltage is shown first it is 3 phase.
mtnelect
HVAC & Electrical Contractor
- Location
- Southern California
- Occupation
- Contractor, C10 & C20 - Semi Retired
This might help to explain.
- Location
- Illinois
- Occupation
- retired electrician
What does multi-grounded neutrals have to do with the subject of this thread?
mtnelect
HVAC & Electrical Contractor
- Location
- Southern California
- Occupation
- Contractor, C10 & C20 - Semi Retired
I thought it would help explain why there is current flow on the neutral when there is no load on the transformer.
- Location
- Illinois
- Occupation
- retired electrician
Still not sure what that has to do with a single vs 3 phase thread
Joethemechanic
Senior Member
- Location
- Hazleton Pa
- Occupation
- Electro-Mechanical Technician. Industrial machinery
I was just hoping there was a name for it I could tell them to google so they could read or watch videos or whatever they want to do. It would save trying to explain it to these guys one by one. It ain't like I've got them all together in a classroom
mtnelect
HVAC & Electrical Contractor
- Location
- Southern California
- Occupation
- Contractor, C10 & C20 - Semi Retired
When @Joethemechanic mentioned; Even if your 120 single phase loads are perfectly balanced you will have a neutral current. For me, it triggered my reference to current flow on the neutral(s) and my assertion that this is why there are so many problems with GFCI. And all neutral(s) in general. I guess, I am stuck on neutral !
- Location
- Illinois
- Occupation
- retired electrician
What problems are you talking about.
Joethemechanic
Senior Member
- Location
- Hazleton Pa
- Occupation
- Electro-Mechanical Technician. Industrial machinery
I actually went out one time to look at a 3 phase radiac chop saw that tripped the overloads whenever they tried to cut anything heavy. High leg delta service. Back at the panel the branch circuit was connected to B, C and neutral. Opening that panel and seeing a 2 pole breaker for a 3 phase load had me going WTF for a minute
mtnelect
HVAC & Electrical Contractor
- Location
- Southern California
- Occupation
- Contractor, C10 & C20 - Semi Retired
Please insert the word wiring.
Joethemechanic
Senior Member
- Location
- Hazleton Pa
- Occupation
- Electro-Mechanical Technician. Industrial machinery
This thread is starting to remind of that time at church when I said Adam must have had free will before the fall because God allowed him to name the animals
winnie
Senior Member
- Location
- Springfield, MA, USA
- Occupation
- Electric motor research
Back in January I proposed 'psingle phase' as the name for this system, but I don't think the term has caught on 
Apartment single phase vs three phase
Is a 120/208 volt, single phase, 3 wire feeder more expensive than 3 phase, 4 wire? if you have a 3 phase, 4 wire feeder, wouldn't the extra phase wire offset any savings? What's everyone's experience? Also, is a 225 amp,120/208 volt single phase panel more expensive than a 100 amp, 3 phase...
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