Just a mathematical observation: 125 + 125 = 250. So 240 would not be a "boost."
You're misreading what the product says. All it can do is combine two opposing phases of 125V. It's not a booster or transformer. It's only capable of doing what already exists in a 250V 50A power supply. It's made for situations where a marina doesn't have 50A service, but you can find two opposing 30A services and combine them. The device also prevents you from pushing 60A (30+30=60) through 50 amp wiring and starting a fire.
Your marina's problem is that it's using two phases from 3 phase power which are not perfectly opposed, whereas single phase 250 has two legs that are perfectly opposed so you get full voltage when you combine them.
P.S. Don't ask how three legs of power is three phase and two legs is single phase. I find it very frustrating too.
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Re: 240 volt from two 125’s using a splitter
--- The poster formerly known as Scrod ---
I want to live in Theory, everything works there.
1970 36C375