Our electric brewery will be located in an industrial building that is fed with 3-phase AC power. Our electrician friend wired two of the hots, neutral, and ground to a Home Depot GFCI spa panel. The panel appears to be wired correctly and pressing the Test button works as intended.
When measuring voltage between each leg and neutral we get 120V, but sure enough, across the two "hots" we get 208V.
What is going to be the effect of only feeding 208V to the 5500W heating element - I'm guessing it will take longer to reach boil, but boil it will, correct?
Second, will the GFCI work as intended if it needs to - that is, will the fact that we're only using 2 of the 3 legs of the 3-phase power somehow cause problems such as GFCI not tripping when it needs to, or tripping when it's not supposed to? There are also 120V pumps powered off one of the hots and neutral.