3 ms·
An 1cm-ish thick copper cable can handle about a kiloAmp without melting. At 10kV you'd need 12 of them, so call it a 5cm thick bundle with some kind of cooling
by Schroedingersat 4y ago
An 1cm-ish thick copper cable can handle about a kiloAmp without melting. At 10kV you'd need 12 of them, so call it a 5cm thick bundle with some kind of cooling for the 1m tunnel that needs 120MW.