philipma1957,how are the apartments connected to the electrical network?
In Russia, in a private house, you can connect 2 wires as standard: phase (hot) and ground, and then the house will have standard 220 volts.
But you can also connect 4 wires, these are 3 phase (hot) and ground, and have 380 volts and 220 volts.
380 volts can be used for powerful electrically heating boilers, a personal workshop with professional woodworking machines, and anything else.
But there is a secret here: limiters are not installed on a 220 volt connection, but consumption limiters are installed on a 380 volt connection so that there is no production in a private home. But for a bribe, a local electrician will replace these limiters
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But in an apartment, as a rule, there is only 220 volts, although you can connect 380 volts, for example, for a bathhouse in an apartment, but you need to pay for the project and connection, but this is a rare case.
3 wires come into a private home.
hot 110 volt
hot 110 volt
ground
panels in a home are typically
100 amps
150 amps
200 amps
400 amps but rare for a private home
my panel is 150 amps
my 2 hot legs run at 119-121
So I do 238 volts to 242 volts.
I have a 220/240 circuit for the ac
I have 3 220/240 circuits for mining
I have 30 circuits for 120 volts.
I do not mine at home for profit I support the commercial mine in Clifton.
It is more like your setup but we have a 320kwatt standalone transformer that feeds to an 800 amp 440 volt panel
that feeds to 2 sub transformers 1 at 220/235 volts 1 at 117/120 volts.
As to apartments. I lived in one in New York City 1986 to 1992.
It had a circuit panel with 6 120 volt 15 amp breakers
It had 2 220 volt 20 amp breakers.
the 220 volt were for the electric stove top and oven (breaker 1)
and for 2 in wall ac units (breaker 2)
funny thing is that apartment house had 5 apartments.
each one had a separate circuit panel with all 5 meters on the first floor.
We had a major blackout in 1987 most but not all of NYC was turned off.
My block was dead and me neighbor hood was dead for miles. yet I had power to my refrigerator.
of course no btc back then.
I often think about that 'free' circuit
1) how much could it do
2) how did it get setup
3) would I have been able to do a decent rig or two on it?