I try to set a small size mining farm. I try to understand 3 phase electricity, but it is difficult to understand. I asked many electricians but everyone has different answers and I am kind of confuse.

I want to know the capacity of my 400 amp panel. It is 3 phase. I believe it can make 240v with two lines. It has a wildleg(208v? delta system?).

How many s9 can run on this panel?

My simple head calculate like this...I feel like something missing...
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Each Machine operate
1440w/240v = 6 amp
400Amp panel
so 400amp / 6amp =66 S9s
 
Constant electricity so 80%
66.66*0.8 =53 S9s
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Is this a right way to calculate?