400 kcmil in copper.
A 3 phase 20 amp electrical appliance uses 20 amps per phase. Not 6.6 amp!
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200 amp service entrance wire should be AWG # 2/0 copper or 4/0 aluminum.
simply four but also aplying diversity they may be increased depending on situation
It means 225 amps on each phase.
#4 thhn wire
The formula you are looking for is Watts = Amps x volts = 100 x 240 = 24000 or 24 KVA x pf. The most likely single phase generator would be 25kW as it is a standard size.
100 or 105 amp.
30,60,100,200,400 and 600 amp
No. Three phase service is something that you would need to request from your power company. You'd need to not only have service, you also need to have an electrician run 3 phase service into your home.