Where one runs into the problem of wrong voltage/number of phases often is when owner gets a great deal on used equipment, then spends a bunch of unexpected money, maybe even more then the equipment cost him, making it work.
Yes, I've heard of examples of that on this forum. Unqualified people checking the specs.
You probably don't see as much of that though, as nearly all single phase equipment for you is ~230 volt and three phase equipment is ~400 volt. Until you get into higher power applications anyway where you have over 1000 volts as the system voltage.
Yes, that's true for many standard applications engineered here.
But, quite a lot of my experience was on custom build, sometimes from basic component level. Things like a common DC buss for variable speed DC drives, sub-synchronous converter cascade systems (Kramers), AVRs, high current rectifiers for anodising and wire welding etc........so I saw a lot of non-standard voltages.
One aspect of that I've noted here is that members often seek advice on standard transformers available to change the voltage for a particular application. Ours were mostly custom built. If you want say, 920V/11kV it has to be.
However, we also did VFDs typically for fans, pumps, and compressors with standard voltages. Rarely single phase though.
I suppose power electronic applications best describes what we got up to in our not so spare time.....
I digress. Mods, be kind.
