I love scrolling through shorts and hearing "Wanna see something cool?" The answer is never "no"😂

I've been watching for two or three months now but don't understand a single thing. Especially about the fases he is trying to explain here. Still awesome content.

I'm here for the dad jokes.

He's got that 'Tism Rizz'm (genuine interest in the topic) 😄

Yea 18 years here but this man can teach

HUH???????????

That certainly sparked something in me!

Was not expecting an electrical engineering kink when I woke up this morning, but here we are.

Gets you all amped up huh?

531 Likes and no comments?.. No way..

Don’t feel bad I took and passed a industrial electrical class and this shit still confuses me

That is probably AC servo motor. Used with synchro feedback.

Wouldn't that be found in usa household 240v machines? As for the motor split phase should work like 2 phase

Wow. What the heck would you use a motor like that for?

180°? Wouldn't that just cancel itself out?

Wow buddy, that's pretty neat!! Did it come from the northern US by chance?

Thanks, dad!

You’ll become Phase Man, master of electrical phases

Then you need better training, if a truck has two 12 volt batteries, to make 24 Volts, is that truck split phase DC?

@@elonmask50 do you tap the jumper between the two batteries to get two 12v circuits from that 24volt system? Look at what's happening at the transformer. The output, hot-to-hot, is 240 volts. Then there is a center tap "splitting" that single phase into two 120 volt segments with a "common" or "neutral" in the center. This is "kind of" done with 120/208, but you are tapping off the common between three phases at 120 degrees from each other. Making 208 hot-to-hot(delta), or 120 hot-to-common(wye). If you run a high leg delta on a 208 transformer you can get 240, but the transformer phases are not balanced. And if you center tap the three phases in a delta transformer, you get 104, or 240 depending on which hot and which common you are testing against.. so not very useful. Back to the 12+12 for 24 volts DC. Trying to center tap that will just make a mess since the batteries need to be matched and balanced.

​@@treyhart6861thx for trying to explain.

Split phase is exactly what it is. A single phase with a center tap, "split" into two legs.

@@elonmask50 it's not called split phase with dc, because there is no phase. it's a center tap. you can consider the center to be 0 volts then you'd have + and - 12 volts, or the negative can be 0 volts and you'd have +12 and +24 volts

The electric ovens, laundry dryer, water heater here use 120, 203, 240, 250VAC. Industries get 208~600+VAC. Welders will run off of 230~250 since the max current is 125 Amps to a home.

I guess it's pretty standard to have three phases in every building if you are not living in the best country in the world 😜

I never understood why 230/240 isn't universally used. It's more efficient than 120/110 while being not nearly as dangerous as 400V. My dream home input would be 500A at 480V for a total of 240kW. Yes, it would actually draw that much current LOL.

Commercial and industrial use 3 phase in the US. High density residential can be 3 phase or as he described. Houses are as he described. Connecting to both hots gives 240V, used for all big appliances.

most homes in america have much higher kw supply. 320 amp split phase (single) 120/240 is available everywhere and lots of homes can take 3 phase, most small business have standard 480v/400 amp service.

Do you know the reason that they bothered to have a custom power system and all the headaches that come with it like custom gennys custom switches and so forth?

If I recall right, that's not two phase. It's two phases of a three phase system.

Why? You can't get rotational motion from it easily, unless it's only 90° out of phase

Two phase generators are evil, I tell ya. Maybe even worse than single phase compressors directly connected.

Can you elaborate on the reason to chose such power system?

Everything is based on potential. We use earthen ground as a reference point basically the zero in potential. When you ground at the center of the 240v winding you get 120v hot to ground but still get 240v hot to hot.

_My_ old Dutch house (goeiemorgen buurman) ran on one single 25A phase. But when I moved in, they only had to change the meter and connect the loose terminals to give me 3 phase power for the garage, the induction hob, the cannabis farm in the attic, the s&m basement, the counterfit printer, the absinth still and the AC. And my house was really old-fashioned; for you Dutchies: with red and green wiring. Still, the cables were all there from the start.

Most homes in the US get 240-250 VAC

You have 3 phase because of inline direct water heating. And single phase unlike murica and muricans (who occupy most of social media) because unlike them you have a reasonable supply of 220/230volts. In india ,ost houses have a max of 3 kw single phase supply at 230v and 50Hz as most Indians would balk at paying anything over 50 usd or 4000 rupees per month for electricity charges.

Okay we get it, European power standards are better

Wow 25 amps for the entire house? What’s the voltage?

Instructions unclear, i have 2 neutral wires

Still don't want to connect those two wires together...

I didnt understand a thing. Maybe because idk what "phase" means and i am a dumbass

Could have been done better with a couple of diagrams, but it's a good enough explanation.

Yes. If you listen carefully, you might hear his American accent.

I guess so, and I wonder why. Three phases into every home appears to be the smarter solution to me. With more and more heavy loads, i.e. heat pumps and EVs the advantage will be more obvious.

Indeed, Europe and a lot of the world use 240 rather than the 110 we use.

Yes North America. 2 hots to neutral at 110v or across both hots for 220v on a single phase.

Delta to star? I assume your "star" is what we call a "wye"? Or?

Two-phase power can be derived from a three-phase source using two transformers in a Scott connection: One transformer primary is connected across two phases of the supply. The second transformer is connected to a center-tap of the first transformer, and is wound for 86.6% of the phase-to-phase voltage on the three-phase system. The secondaries of the transformers will have two phases 90 degrees apart in time, and a balanced two-phase load will be evenly balanced over the three supply phases.

What phase means, is where within the cycle, the waveform starts at a given point in time. For 3-phase, one of the waves starts on a rising node like the sine function. The next phase starts with a time delay of 1/3 of a cycle, and the final phase is time delayed by 2/3 of a cycle.

Once the old, gargantuan motors they supply have stopped turning, two-phase supplies disappear entirely.

They're still using Scott T transformers? I thought all of those things were already retired?.

Likewise in Slovakia, you must always lay a supply cable of at least 4x10mm2 Cu or 4x16mm2 Al (the length of the cable also depends) in every new family house, even if you will use only 1 phase, which is possible in agreement with the distributor. (and often each floor in the house is connected to a different phase due to the equal distribution of power) But the most common connection to houses is 3 phases 400V with a 25A circuit breaker. Electric heaters are no longer used here, but houses in the villages have many appliances with large motors - from water pumps to circular wood cutters with 5kW motors, heat pumps or, in the future, cars. Somehow I can't imagine similar machines connected to 1 phase 230V or 115V.

We have a 240/480 split phase arrangement in some rural supplies in the UK. Can also be used to supply higher power demands than single phase but it still can’t start an electric motor!!

It is because it is an American system and much of the world does not do it that way. And with good reason. Because it is crap. It's a fudge, a crude workaround to get around a low nominal voltage of 120 volts. In a normal 3 phase system with a nominal voltage of 120 V the phase to phase is 208. In Europe it is 400V. America realised at some point their nominal voltage was far too low, but rather than address that particular problem, they came up with a solution of split phase, where you can get 240 volts out from a 120 volt system. It is one big fudge. It's rubbish. Europe doesn't do it like this, because it does it right, right from the get-go. US: 208 volts 3 phase. Europe: 400 volts 3 phase.

Except it's 480 volt center taped.

Indeed, the entire debate is a semantic one that depends entirely on the definition of a "phase". Look at it through the eyes of an electrician and it's a single phase supply. Look at it through the eyes of mathematician describing sin waves and there's clearly two that are 180 degrees out of phase.

You have neutral bond issues and it can/will kill you.

Your trailer has a short You are the ground cable

@@user-kb2bs9hy2v yeah I did figure it out eventually. For the first month I thought I was having mini strokes because it didn’t feel like shocks my arm would just go numb

Open delta with two transformers will work for motor loads, but it stinks for three phase rectifiers for a high powered broadcast transmitter, for the same reason brayden has trouble with his VFDs

To put it simply and not go into too much detail - transformers can turn any voltage into another voltage depending on how it's configured. At work you'll see the high voltage switchgear commonly stepped down to 600 or 480 for 3 phase (along with 277). The using a center tap transformer similar to what Chris described, you can get more single phase connections for 208, 120, or basically anything else. That was a super high level overview, hope it helped!

I have often wondered the same..

208 is what you get if you connect to just two of three phases on a 240v hook up. 277v is two out of three but when its at 480v. This is just what I know it has to do with phase timing.

On a 120V/208V 3 phase transformer, you get 120V when connecting to one of the lines and neutral, and 208V when connecting between two of the phases. 277V comes from a line to neutral connection on a 480V 3 phase transformer.

That's a really good question. It's actually a bit difficult to explain without graphs at least for me.(Not a good teacher) If you were to have one phase AC you would draw a sine wave on a graph representing the voltage. The center line would be 0 volts. If you were to have two phases 180° apart. You would draw two sine waves where the peaks are the opposite of the trough of the other wave. If you were to have three phase AC each phase is 120° apart. The slightly lower voltage comes from the fact that when you put a load across two of the three phases they don't perfectly oppose each other. So that would make the max potential between the two slightly lower even though they both operate at the same voltage. Hopefully that explanation was somewhat good enough to get the point across. There's an electro boom video explaining this because his apartment has a lower voltage because of it. There are some other good KZfaq videos But I can remember that one off the top of my head. If it's still not clear I can try to explain it more. Now that I think about it that might actually make a pretty good short. He would definitely do a much better job than I did.

They are 180 degrees opposite polarity, but they are not "out-of-phase".

Absolutely correct ​@@edisont.picard4112

It's mathematically equivalent to two voltage sources that are 180 degrees out of phase, which you might think should be 2-phase by extrapolating the idea of 3-phase. We don't call it 2-phase for historical reasons, since that term is spoken-for by a now-obsolete system. 2-phase has a 90 degree phase shift instead of 180 degree phase shift. Early motor designs did this, so at least one phase could always get the motor started. For modern split-phase motors, we use a capacitor to produce an almost-90 deg phase shift, to do the produce a quasi 2-phase circuit to the windings temporarily, and then shut off the starter winding after it gets up to speed.

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I am amazed that people cant understand this simple concept.

Except "two phase" is a perfectly adequate description of split-phase. Not understanding the supposed distinction is not a technical misunderstanding, it's just lack of familiarity with what the electrical industry happens to call it.

I once worked at a chem lab that used the same setup. The idea was to get 130 V phase-to-ground if someone should touch a live wire and a water tap at the same time, making electrocution a little more survivable.

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