I literally talked to my electrician yesterday about expanding my home test lab environment and he indicated it would be something like 280amps.... And I started blowing my 30amp circuit with just 2 miners (A10 and a S19J 100). So do that math repeatedly, triple check.
If the circuits in the home were built for 30amp then you're going to need a lot of rewiring to get 280 amps, I doubt you have more than 4 mmp for those from the start, and trying to draw 50kw on them?
However, you MAY have higher powered connection. The point is, check your electricity bill and see the tariff. As far as 3phase is concerned, you don't always need that for a single S17 to run. Just connect the miner to a MCB with atleast 16A freely usable for the miner.
If he lives in a block of flats there is little he can do, for sure it's not a case "higher powered connection", he will have to settle for what the wiring from his apartment to the main circuit is, and you won't see huge numbers there, the best I've seen is 80 and this in new flats that were built taking into account all the stuff people use nowadays. My old flat where I lived was built in the '70s had just 30, and it was always a rule not to start the vacuum cleaner went the washing machine was on.
I had a thought for how you can mine using more normal power. Instead of trying to do transaction validation type mining, you can provide service mining. I use this term because when you do service mining, you are providing a service like network or storage. You could run a storage node which pays you coins. For example a Filecoin server does mining, just not transaction validation mining. Those servers run more on 120v and would be less heat / electricity. Just an idea (I am looking into this as well).
As for my test lab, it got moved out to the garage. Its running off a 100amp panel circuit run to a distribution box with 2 50 amp breakers. From there it is going to run to 2 60 amp metered PDU, so I can gauge load per PDU and overall. So far I have 3 running at 26 amps continuous. Will bring more up later this week.