Flip or invert main breaker

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EATDIRT

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SE Wisconsin
My question is that I installed a square D QO 3 phase 4 wire 42 space 200 amp MB panel. I installed the panel with the MB on the bottom of the panel. The panel is rated for the MB to be either on top or bottom. Out of the box the MB is on top and the switch is in the vertical position. Now with the MB installed with the main breaker on the bottom the lettering on the main breaker is upside down. My question is can I flip the MB 180 degrees? Will it still work correctly and can I do this? I know I can physically do this because the lugs and mounting hardware can be installed either way.

Thanks
 
Unless the breaker is marked line and load at the terminals, you can reverse it. In fact 404.7 requires you to reverse it so that when the handle is up the breaker is on.
 
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