There is no ”extra power”
What you're seeing is a MAXIMUM per circuit
It's not possible to exceed the incoming power levels
Each circuit is capped at X-many amps
September 12, 2020 at 11:44AM
via reddit https://www.reddit.com/r/explainlikeimfive/comments/ireowq/eli5_if_a_400v_100a_three_phase_electrical_supply/g4xtsje?utm_source=ifttt