How you guys avoid overload?

on a 220V country, max load on a wall socket is 13A, MCB is 20A
1 wall socket max is 2800W and whole MCB is 4400W only

for a GTX1080ti mining card... just 1 card about 250W already.
just 10 Card with motherboard and etc.... power consumption is FULL load a wall socket already.
whole MCB loading just 4400W, so in a room you cannot connect more than 4400W in full load...

I see people in home have over 20-30pcs GTX1080ti exist.... how can they do it??

change to 3 phase???