Funny, flowmeters showed up when I posted, don't any more.Thanks, let me check that last link. So you can see the pic of the four flowmeters?
The whole thing is grounded because of the metal faceplates, so should a hot wire somehow come loose (which I don't ever expect it to) and touch the case, any part of the faceplate, or the floating buss bar network inside, it will immediately trip the breaker at the generator (which is a 30A breaker for the two hots). The hots for the 120V outlets would of course trip the 20A breakers and not the 30A generator breaker. The reason I put 50A breakers in it right now for the 6-50R outlets (as opposed to 30A like the generator) is mainly to serve as on/off switches at the moment. Later when I get a larger generator that is capable of more than 50A then those breakers will be true protection devices that would trip before the generator.
Thanks for the education and explanation.