# Will a Corsair 1600 Watt power supply rated for 200-240 Volts A.C. input work on 120 volts A.C.

#### Shrek

I know what 3 phase is, but what is 2 phase?

#### Caring1

I wouldn't expect any problem unless the situation was reversed, running a 120V PSU on 240V.

#### newtekie1

##### Semi-Retired Folder
You would need a dual phase outlet to run that psu, single phase is no go
Nah, no need for two phase.

I know what 3 phase is, but what is 2 phase?
Two ~120v phases running 180° apart. Most homes in the US are connected to 2 phase power, each phase provides 120v when connected to neutral. But you get 240v if you connect across the phases.

#### 1freedude

You would need a dual phase outlet to run that psu, single phase is no go
Thats what I dont understand about two hots vs hot and neutral. I understand hot and neutral (black and white, respectively) give 120, two hots (black and red) give 220, and two hots and a neutral give 220 and 120 separately. So, if you give that PSU two hots, it will allow full output...otherwise, hobbled output?

Edit

I gurs wurt im asking is whats the difference between USA 220 and rest of world 220?

#### qubit

##### Overclocked quantum bit
I gurs wurt im asking is whats the difference between USA 220 and rest of world 220?
Only frequency: 60Hz USA, 50Hz most other places.

#### R-T-B

Supporter
You would need a dual phase outlet to run that psu, single phase is no go
Not really. A 15 amp single phase can just barely deliver around >1600W, but your pushing it pretty hard. And I doubt the cables included are of sufficient gauge for more than 1300W, as mentioned.

#### newtekie1

##### Semi-Retired Folder
I gurs wurt im asking is whats the difference between USA 220 and rest of world 220?
Most of the world uses a single phase 240v. So you have a single 240v wire and a neutral at 0v. Electricity is all about voltage differences. So if you connect a 240v wire to a 0v wire, you get 240v. If, for example, you had a 240v wire and neutral was actually at 15v for some reason, connecting them would give you 225v.

The US uses a split-phase(or two phase) 120v system. You have one phase at 120v, one phase at -120v, and a neutral at 0v. If you connect either one of the phases to neutral you get 120v. But if you connect one phase to the other you end up with 240v difference.

Obviously AC means the the phases are alternating. So the rest of the world the phase flips from 240v to -240v. In the US the phases flip between 120v and -120v, but they are always opposite of each other, so they is always 240v difference.

Only frequency: 60Hz USA, 50Hz most other places.
It's more than just frequency.

Not really. A 15 amp single phase can just barely deliver around >1600W, but your pushing it pretty hard. And I doubt the cables included are of sufficient gauge for more than 1300W, as mentioned.
Then there is the fact that 20A circuits exist.

#### looniam

Thats what I dont understand about two hots vs hot and neutral. I understand hot and neutral (black and white, respectively) give 120, two hots (black and red) give 220, and two hots and a neutral give 220 and 120 separately. So, if you give that PSU two hots, it will allow full output...otherwise, hobbled output?

Edit

I gurs wurt im asking is whats the difference between USA 220 and rest of world 220?
the rest of the world is 240 v (single) phase to ground whereas the US is 240v phase to phase (180 degrees) which makes it sketchy that it would work. was told by a licensed electrician it wouldn't with a ATX PSU. sorta like a sine wave issue if i recall right,(?)

#### R-T-B

Supporter
the rest of the world is 240 v (single) phase to ground whereas the US is 240v phase to phase (180 degrees) which makes it sketchy that it would work. was told by a licensed electrician it wouldn't with a ATX PSU. sorta like a sine wave issue if i recall right,(?)
Electrically the end result is the same as far as the PSU is concerned.

I ran several mining european psus this way back in the day off my USA dual phase, and compared it to standard 120v USA. Anyone remember my article?

#### looniam

Electrically the end result is the same as far as the PSU is concerned.

I ran several mining european psus this way back in the day off my USA dual phase, and compared it to standard 120v USA. Anyone remember my article?
well thank you. no kidding you're the first person i've heard/known that actually did it. (of course i'll take a frog's word for it, when has a frog ever lied?) i myself thought it possible until my aforementioned conversation.

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#### ThaiTaffy

It might be that the PSU can run 120v but if they labeled it as such they couldn't class it at that efficiency rating.

Either way testing or no testing I would still prefer to get direct confirmation from Corsair that way they cannot void the warranty in the event of failure.

#### newtekie1

##### Semi-Retired Folder
Available power?
No, the end result is basically the same as far as electrical devices are concerned, but how it is achieved is different. The US 240v doesn't have a neutral.

#### ThaiTaffy

The US 240v doesn't have a neutral.
Wait what? How does that work alternating phases? Without a neutral there is no supply of electrons.

#### juular

I wouldn't expect any problem unless the situation was reversed, running a 120V PSU on 240V.
Not now it works. There are 230V only PSUs for a reason. Lower voltage puts more stress because for the same power you need higher current. There are no 120V only PSUs, if it works in US then it's full range and works worldwide.

#### ThaiTaffy

The US 240v doesn't have a neutral.
Just looked it up it does have a neutral plus two alternating phase 120v live wires so including a ground that would make us 240v a 4 wire system though I'm not sure how the 60hz would affect a PSU, frequency is important with motors but PSU's I'm not sure.

#### looniam

Wait what? How does that work alternating phases? Without a neutral there is no supply of electrons.
each one takes turns being the other's neutral ever have to wire a 240v outlet for an appliance?
each phase being 180 so -180 +180 = 0 however the potential is still 240v.

what your'e talking above is for RV's:

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#### ThaiTaffy

each one takes turns being the other's neutral ever have to wire a 240v outlet for an appliance?
each phase being 180 so -180 +180 = 0 however the potential is still 240v.

what your'e talking above is for RV's:
View attachment 221554

This makes more sense to me

#### newtekie1

##### Semi-Retired Folder
Wait what? How does that work alternating phases? Without a neutral there is no supply of electrons.
The electrons come from whichever phase is currently in the negative section of their sine wave.
Just looked it up it does have a neutral plus two alternating phase 120v live wires so including a ground that would make us 240v a 4 wire system though I'm not sure how the 60hz would affect a PSU, frequency is important with motors but PSU's I'm not sure.
The neutral is only there for devices that use both 240v and 120v(yes those exist). The neutral is actually for the 120v part of the device, and there are also devices that have no neutral at all just 3 pins on the plug, one pin for each 120v phase and one for ground. My electric cloths drier is 240v, for example, and has no neutral at all.

#### eidairaman1

##### The Exiled Airman
Thats what I dont understand about two hots vs hot and neutral. I understand hot and neutral (black and white, respectively) give 120, two hots (black and red) give 220, and two hots and a neutral give 220 and 120 separately. So, if you give that PSU two hots, it will allow full output...otherwise, hobbled output?

Edit

I gurs wurt im asking is whats the difference between USA 220 and rest of world 220?
Yup only half output, you would need an outlet in a us home that can put out 208-250VAC (Reserved for Electric Dryers, Ovens, Microwaves, Air Conditioners, Electric Heaters).

It all deals with magnetic poles and their spacing.

2 phase is 180°- 2 waves being transmitted at 180° from eachother, 3 phase power is 120°, 4 phase is 90°, 6 phase is 60°. 8 phase is 45° Aka full circle or AC, AC is a full sinusodial wave, DC is half that.

#### ThaiTaffy

Do I have to watch videos?

Im guessing it must work the same as 3wire delta just shocked me that you would use a phasor L1/L2 system in a home.

#### eidairaman1

##### The Exiled Airman
Do I have to watch videos?

Im guessing it must work the same as 3wire delta just shocked me that you would use a phasor L1/L2 system in a home.
Its split phasing,homes here get 208-250VAC and then they shunt it with a neutral to get half of that.

Ive had to replace the main breaker in a home before (old n worn out), disconnected the Wattmeter to do it.

Ive had to hook generators directly into the breaker panel while having the main off during the 2021 South Freeze and then a Hurricane Last Month...

#### ThaiTaffy

So all homes are supplied with 240 phasor for cost saving and efficiency then it's split via neutral In the home so you lower efficiency and consume more power. Ok I understand now.

#### Shrek

Two ~120v phases running 180° apart. Most homes in the US are connected to 2 phase power, each phase provides 120v when connected to neutral. But you get 240v if you connect across the phases.

Ah, so it looks exactly the same as single phase 240V

The split system is dangerous in that a bad connection can result in 120V appliances receiving more than 120V.

Power surge due to an open neutral wire. - Bing video

It is a way used to get 110V from 220V and is not done in the UK, so while in the US a bad neutral can result in a lot more than the working voltage (110V), a bad neutral in the UK will not give rise to more than the working voltage (240V).

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