First of all, thanks for the links.
Secondly,
Does it have to be 240V, or is 220V enough? Cause I see lots of people saying 220V and many others saying 240V.
And if I went with the bitmain, I would need 2 of them to power 1 miner right?
no 220 = 240 for all intents and purposes
not the bitmaintech comes with 10 wires and will run the s-9.
so if you have 220 you are good.
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I will add that in a commercial 3-phase setup all the above run perfectly on the typical >208VAC you get across the phases. Most of my ~18 or so kw farm at work runs on it.