Are you certain about that? If so, then why does code call for #6 wire (50A carrying) on a 220v/50A circuit?
I'm not saying your wrong, but my understanding differ. For power to balance, 220V x 50A = 11KVA 110V x 25A x2 = 5500VA. Those are two very different animals, the latter requiring only 10ga wire. Both legs should deliver [email protected]
, 180° out of phase creating a 0V return on neutral. With either leg at full load, and the other no load (110v split), the neutral return would carry at max 50A, thus requiring a #6 wire.