No, we have 400V 3P+N, so we have 230 L+N in our houses (240V/415V in UK) or 400 3P+N without much effort. Until '60, in my country (Italy), we had 220V 3P+N and 127V L+N, then it was standardized to 220/380 and then, 230/400V in 2012.
Your description of the 240/120 volt system is essentially correct, although a little muddled. These systems are actually, specifically called "split-phase" systems, because they are (as you said) splitting the single phase 240 in two. BTW, great idea to show an actual pole-mounted transformer for reference! (Although, I've NEVER seen a utility use a guy-wire as a ground bond!) Here are two great YT videos from another channel, which describe VERY WELL how split phase systems work, and what happens when a neutral opens on a 240/120 split phase system: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-nOSYHUxHxG8.html ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-LJvyb_WujZg.html
I have seen all of Dave stuff. I have built he battery stack and wired to a 120/240 panel. I have also done videos with losing a neutral but I did it with line voltage form a panel
This video I explain how it actually works and why the neutral carries only the imbalance ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-LEV-O30WDSY.htmlsi=kQwJ5vS7EHCtK8Gv
Was taught split phase is only certain single phase motors that usually use a capacitor to produce an out of phase power to a start einding to produce starting torque. What uou have us 100% single phase 3 wire secondsi 120/240 volt system with the center tap grounded to profuce a GROUNDED CONDUCTOR on and not a nuetral !
Not saying you're wrong about your power pole, but most have the neutral/ ground on top for added lightning protection. The hot wire is on the bottom. Look at the plethoria of power poles, whether 1 or 3 phase, the gound is usually on top. This is intentional so that lightning will hit it first, according some protection to the hot wires.
@Joe-by8jh Huh! In the US, except for some older systems, it's usually the way. I grew up in a rural setting, and we had REA systems. They were always single phase, ground on top. But then again, you could guarantee a few hits every time a thundercloud pops up within 10 miles! And an outage if it took a good hit.
Here in Texas, on single-phase HV distribution (7200v to ground), the hot leg is always on top, with the neutral below... I've never seen the neutral above the hot. Also, since all pole-mounted transformers have their H1 bushing (or bushings) on top, it makes the jumper short & safe (through a drop-out fuse). And we get A LOT of lightning here. Very rarely are ourages (here) caused by strikes.
That "25" is not the "kW" of the transformer (kW = kilowatts). That 25 would refer to the "kVA" - the "kilovolt-amp" rating - of the xfmr. Thus, if you know the secondary voltages of the xfmr, you can then calculate the available full-load current rating - at a given voltage - for that xfmr. You could also calculate the input current (at full load) if you know the input voltage. Since that is a single-bushing primary xfmr (and tied to neutral), here in west Texas, the primary voltage would typically be 7200v, being derived from one phase of a 12450v, 3-phase primary distribution.
@@Calico5string1962 For the *average* residential consumer ... 25 kilowatts is the correct answer. Your convoluted and esoteric answer of ... 25 kva provided no useful information, to the average person. You did not even answer the question, that was asked.
@@MrSummitville Sorry sir, but a "kilowatt" is not an measure of fault current [either]. A kilowatt (kW) is a unit of power... while amperes (amps) is the unit of current measurement. The question asked was flawed initially (as is your answer) , and so my "answer" was attempting to correct/clarify the terminology used in the original question. That said, the available fault current in a 25kVA transformer would be in the thousands to tens-of-thousands of amps range, and would be dependent upon the nature & type of fault, and ultimate duration (i.e., clearing time). This is why "service-rated" equipment typically has a minimum interupt rating of 10,000 to 20,000 amps - or more, depending on the system operating voltage. Lastly, most "average residential customers" would have no idea what fault currents even are, much less what the utility's transformer ratings would be. Thus, the esoteric nature of my answer....
