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At 1000V, 1000A require 0.13cm wire diameter[0] over 2 Meter with 5V voltage drop, just 15 AWG.

A 5V drop at 1000 Amps also means 5000 Watts of heat generated, you probably want something with less of a drop.

There will be free hot showers, electrically heated Brazilian-style.

Yeah that turns the cable into a 5kW space heater.