28 votes

Why is North American residential power called single phase?

Because it is a single phase, with a center tap. That's all it is. There's nothing more exciting than that. It is a 240V transformer secondary with 3 taps at 120V spacing. Most installations have a ...
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19 votes

Why is North American residential power called single phase?

Why is North American residential power called single phase? Because that's exactly what it is. Utility power in North America is distributed via single-phase transformers with their primaries being ...
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  • 11k
16 votes

Why is North American residential power called single phase?

The "single-phase" terminology is nearly always used in the context of three-phase supplies as this is the standard method of power transmission used throughout the industrialised world. ...
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  • 160k
14 votes

Can I hook up a single phase switch to an electric wood splitter?

"THIS MACHINE KILLS" WHAT YOU ARE TRYING TO DO HAS "ISSUES" EVEN WHEN DONE "PROPERLY. Here I've copied material from two comments by J: From the manual : For your safety, your log splitter is ...
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  • 143k
9 votes

What capacitor(s) will be best replacement

I needed a 6 uF replacement and only found a used 5 uF and a used 1.25 uF. With the help of several answers, I decided to only install the 5 uF capacitor. The motor started fine on its own. Having ...
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9 votes
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An overseas company is making a machine for me and they need to know whether I want 1,2 or 3 phase and what voltage

"out of your element" .. okay. Heating elements are most of your power and 30A at 240VAC is 7.2kW. I think 240VAC/60Hz is what you want. Three phase power is going to restrict you to industrial ...
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9 votes

Why is North American residential power called single phase?

This is perhaps opinion based, but I believe the reason we avoid the term "two-phase" is historical. A long time ago, two phase power with a 90 degree phase angle was somewhat commonly used. ...
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  • 25.1k
7 votes

Single phase 3-speed AC motor won't start spinning or spins in wrong direction

An AC motor which uses a start capacitor will exhibit this behavior if the capacitor is not connected; it is possible that this motor has a centrifugal switch, which should start the motor by ...
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  • 6,632
6 votes
Accepted

Splitting AC voltage based on phase

I think a Half-Wave Rectifier is what you mean.
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6 votes
Accepted

How do single phase BLDC motors start in proper direction?

After more research was done I confirmed my initial doubts of the statement quoted from the Microchip Application Note which states that a direction of motor rotation at startup can be set by the ...
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5 votes

What enables the home appliances and electronics to work on single-phase?

how do the home appliances (using AC) and electronics (using AC as rectified to DC) continuously function (inspite of periodically recieving 0 current)? A full wave rectifier and reservoir (...
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  • 388k
4 votes
Accepted

Is it a problem in a single-phase system, if a generator shares neutral with the grid?

There is NO problem with the neutral conductor remaining connected. Most electrical codes REQUIRE the neutral to remain connected between the main (grid) supply and the backup supply. Also note that ...
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  • 22.7k
4 votes

What is the easiest way to identify what leg of a 220V panel a 110v outlet is on?

This is assuming North American 120:120 wiring. Suppose you plug an extension cord into the outlet, then run it back to the spot in the house. Also suppose you have a voltmeter rated for safe mains ...
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4 votes
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Correct Wiring of 1 phase 220v Electrical Motor

This site is not meant to be for appliance repair. However - things re motor design and operation may be able to be learned from this. Understanding what is being tried here and what may be wrong and ...
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  • 143k
4 votes
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Change the rotation of single-phase (split-phase induction motor)

You have to stop the motor before you can reverse it. That lets the starter winding establish the new direction (and if the starter winding is disconnected by a centrifugal switch, it lets the ...
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  • 66.1k
4 votes

How to wire 1-phase 3-speed motor

If you have a single-phase three speed split capacitor motor, the following will explain your readings: simulate this circuit – Schematic created using CircuitLab Numbers in Green are ...
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4 votes
Accepted

What is the most efficient 3-phase to single-phase AC transformer for a home grid

The 230/400V three phase system used in most of Europe can supply either three-phase 400V loads or single phase 230V loads (or a combination of both) with no transformer or special switchgear required,...
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4 votes

What enables the home appliances and electronics to work on single-phase?

how do the home appliances (using AC) ... Because motors have inertia: When you spin a motor using single-phase AC, the torque goes to zero when current goes to zero. The actual torque being ...
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  • 37.5k
4 votes

Can I hook up a single phase switch to an electric wood splitter?

If safety is of any concern, than NO you cannot use a single pole switch. Your current switch is a four-connection AC switch. This datasheets has a wiring diagram for a similar switch I used in a ...
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  • 836
3 votes
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generator impedance and resistance

The resistive component of a generator output impedance comes largely from the physical resistance of the windings. How you model this is up to you. Usually we deal with systems intended to have a ...
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3 votes
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Vpp for American split-phase 110V AC

Place a high resistance (perhaps 1M ohm) from your + to - output. Now there is a closed circuit which includes 2 diodes and a resistor. Where is the source in that loop ? (You didn't say you wanted ...
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  • 4,833
3 votes

Using Single-Phase and 3-Phase Equipment?

Most single-phase equipment will work fine on three-phase, assuming all other necessary specs are met. You just connect two of the three legs. The load doesn't know there's a third leg and two more ...
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3 votes
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What does a reverse phase dimmer circuit look like?

A reverse phase dimmer does not have a triac but an IGBT or MOSFET. Such a dimmer contains also the electronics needed to modulate this device. These electronics can be simple or very complex. The ...
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  • 3,860
3 votes

50 Volts on the Neutral (180 Volts on the Live) bad or safe?

The portable generator is designed primerally to provide a 110V center-tapped earth supply as is normally used on UK construction sites. The 230V output is something of an afterthought which is why ...
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  • 19.4k
3 votes
Accepted

What capacitor(s) will be best replacement

First I must repeat that I know nothing about motors! However, knowing that most capacitors like that have a tolerance larger than 17%, I would just use the 5 µF. When they originally selected a ...
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  • 12.8k

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