My machine shed has 230V, 4-wire Delta 3-phase. Here's a pic of the breaker panel with the cover off. Can you pick out the 120V single phase, 230V single phase, and 230V 3-phase breakers?

Notice there is no main breaker in this panel box. The box is too far from where the service enters the building so there is a main breaker upstream, that's close enough to the entrance to meet code.

As far as the twist lock plugs on the genset panels, if you had taken a picture, I could tell you what voltage and phase each has hooked to it. They may all look alike, but they're made enough different that you can't plug a single phase 230V into a spot that is hooked to 230V 3-phase and you can't plug a 230V 3-phase into a receptacle hooked to 277V 3-phase. Lots of fun trying to have the right plug for the right receptacle. Bought through regular channels, they're expensive too. Hint: eBay and patience.