Anybody knowledgeable in 3-phase circuit wiring?

[SaturnX]

Originally posted by: calvinHobbs

Originally posted by: Stojakapimp
The motor has not been used before. So here's all I know. There is a circuit breaker that on the panel says 220/108 volts 3-phase. Therefore, I'm assuming that each hot wire is 108 volts when compared to neutral, but 220 volts when compares to other hot wires. If I take two of these wires and the ground or neutral, would that give me a 220 volt single phase circuit?

That doesn't make sense.

If you have 220 LINE-TO-LINE, you have 127 PHASE (per each line) which IS NOT 108V.

--Mark

 

[CalvinHobbs]

and i thought it was standardised at 110/220V or 220V/380V and for UK 240V/420V with a 5% fluctuation

 

[Fiat1]

If your in the USA no such thing as 220/108 volts

 

[CalvinHobbs]

it depends on the standard your system follows, here where i live its 220V between live and neutral for single phase, for three phase in a star configuration you get 220 between any hot wire and neutral and in a delta configuration you get 380V between hot wires and 220V between a hot and neutral

 

[Stojakapimp]

you guys are exactly right...it's 120/208 3-phase...sorry about the mixup

 

[Stojakapimp]

Ok...so then can someone please spell this out for me as simple as possible. If the air compressor needs 110 volts single phase, does that mean that the voltage from hot wire to ground is 110 volts and voltage across each hot wire is 220 (or 208) volts? And if the chiller needs 220 volts single phase, does that mean the the voltage from hot wire to ground is 220 volts and voltage across each hot wire is ~440 volts?

 

[Malfeas]

Originally posted by: Stojakapimp

Originally posted by: calvinHobbs

Originally posted by: Stojakapimp
The motor has not been used before. So here's all I know. There is a circuit breaker that on the panel says 220/108 volts 3-phase. Therefore, I'm assuming that each hot wire is 108 volts when compared to neutral, but 220 volts when compares to other hot wires. If I take two of these wires and the ground or neutral, would that give me a 220 volt single phase circuit?

if you take two hot wires then yes you will get 220V but then where do yo intend to connect the neutral?

Ugh, I'm so confused by this. Ok, so most power outlets in the US are 110v single phase, correct? Does that mean that the voltage between each hot wire and the ground is 110 volts, and then the voltage between the two hot wires is 220 volts? So then what is a 220 single phase circuit? Is that when the voltage between each hot wire and the ground is 220 and the voltage between the hot wires is 440?

I explained that already, a 220 volt single phase system in comprised of two 110 volt hotlegs 180 degrees apart, one hotleg is at 110 volts positive with the other one 110 volts negative which equals a total potential of 220 volts SINGLE PHASE.

 

[SaturnX]

Here, these are the only possible voltages you can get from a 3-phase system, (208/120)

3phase.gif

Between a hot and neutral you'll get the 120, between two hot you'll get 208.

--Mark

 

[Malfeas]

Originally posted by: Stojakapimp
Ok...so then can someone please spell this out for me as simple as possible. If the air compressor needs 110 volts single phase, does that mean that the voltage from hot wire to ground is 110 volts and voltage across each hot wire is 220 (or 208) volts? And if the chiller needs 220 volts single phase, does that mean the the voltage from hot wire to ground is 220 volts and voltage across each hot wire is ~440 volts?

No, you can run the 110 volt single phase and the 208 three phase motor from the same source, but not the 220 volt single phase appliance, it will net a seperate standard single phase feed.

 

[Fiat1]

From the system you have 120/208 v 3p 4w you can not get 220v all that you coul get is 120v from any phase A-B or C to n and 208v if you combine any 2 phase a-b, b-c, a-c,

 

[Stojakapimp]

Alright...well then I'll check and make sure that the chiller can be run on 110 volt single phase. Thanks for all the help

 

[CalvinHobbs]

Originally posted by: Stojakapimp
Ok...so then can someone please spell this out for me as simple as possible. If the air compressor needs 110 volts single phase, does that mean that the voltage from hot wire to ground is 110 volts and voltage across each hot wire is 220 (or 208) volts?

This means that your chiller should be operated on an electrical network where you get 110V on a single phase system, i.e. 110V between hot and neutral!

And if the chiller needs 220 volts single phase, does that mean the the voltage from hot wire to ground is 220 volts and voltage across each hot wire is ~440 volts?

This means that your compressor operates on an electrical network where you get 220V between live and neutral on a single phase system

 

[Fiat1]

Read the name plate on the motor it will tell you what voltage it needs.

 

[Fiat1]

And if the chiller needs 220 volts single phase, does that mean the the voltage from hot wire to ground is 220 volts and voltage across each hot wire is ~440 volts?

This means that your compressor operates on an electrical network where you get 220V between live and neutral on a single phase system[/quote]

Not true 220v single phase is phase to phase A-B not useing the N

 

[Stojakapimp]

Originally posted by: Fiat1
Read the name plate on the motor it will tell you what voltage it needs.

Well the nameplate says 230 but their website says it can do both

 

[Fiat1]

Is it 230/120

What web site?

 

[CalvinHobbs]

aren't there any symbols above the 108/220V on the plate?

 

[JRich]

Originally posted by: calvinHobbs

Originally posted by: JRich
Each hot I believe is 110VAC. You would need 3 hots, 1 neutral, and a ground.

not necessarily, a triangle wiring has no neutral, a delta wiring will have a neutral, iirc then it's 110V between live and neutral for single phase and 220V between lives in three phase, your air compressor will be ok as it operates on 110V but the other two appliances will require stepping up the voltage, the EE here may confirm it

This 5-wire setup will provide 3-phase 220VAC. The neutral is used to provide 110VAC.

 

[Iron Woode]

Originally posted by: Malfeas
I don't think it is possible. You will need to contact you power company and have a 3 phase xfmr installed. Yes, you probably have two hotlegs in your house, but they are not 120 degrees apart electrically. They are 180, the xfmr that feeds you house is only a single phase xfmr, the secondary side is a center tapped with opposite windings, which will give you two hotlegs at 180 degree phase difference.

You can get your 220 volt and 110 volt SINGLE PHASE appliances to work, but unless you have a 3 phase transformer installed, you will never be able to run the 3 phase motor.

Should he get a Delta or Y configuration?

With Y if you lose one phase, you will still get 2/3 of your voltage. This can burn out motors and stuff by undervolting it.

With Delta if you lose one phase the whole thing goes down but your motors should survive.

 

[SaturnX]

Originally posted by: Iron Woode

Originally posted by: Malfeas
I don't think it is possible. You will need to contact you power company and have a 3 phase xfmr installed. Yes, you probably have two hotlegs in your house, but they are not 120 degrees apart electrically. They are 180, the xfmr that feeds you house is only a single phase xfmr, the secondary side is a center tapped with opposite windings, which will give you two hotlegs at 180 degree phase difference.

You can get your 220 volt and 110 volt SINGLE PHASE appliances to work, but unless you have a 3 phase transformer installed, you will never be able to run the 3 phase motor.

Should he get a Delta or Y configuration?

With Y if you lose one phase, you will still get 2/3 of your voltage. This can burn out motors and stuff by undervolting it.

With Delta if you lose one phase the whole thing goes down but your motors should survive.

But if you have a delta configuration, your line-to-line voltage will be the same as your phase voltage, so in this case the only voltage you'll be able to attain is 120V, nothing more.

It's only with the Y configuration where you get the dual voltage, of 208 and 120.

--Mark