submersible water pumps

[ptonsparky]

IDR marking that boosted hi leg, but I suppose that would have been the right thing to do.

 

[kwired]

It depends on how the buck-boost was wired. A single transformer wired 208V to 240V would have the common 'hot' leg which would be 120V to neutral.
However if, as in a previous thread, someone used two transformer each connected to boost the 120V, then neither 'hot' leg would be at 120V to neutral. This is why I mentioned 2 legs of a star, or wye, connection in my post.

Why use two transformers on 208 to 240 single phase boost application though? Other than you just happen to already have a pair that would work for your application. If you did then yes you increase both line to neutral voltages.