Just to be clear, even with an AC Bus 1 Fault and the AC ESS FEED not yet selected to ALTN you don't have an EMER ELEC condition.
If you do have one, you've got 5 Minutes until ADIRU 2 and 3 will lose power. If you can restore any one GEN withtin that 5 Mins you're fine, otherwise it will be a Direct Law Landing.
thinking about it I am not sure you can revert back to alternate law once you have selected EMER ELEC
In EMER ELEC you
are in ALTN LAW until Gear Down, so you woult 'revert back' to NORM LAW if power is restored.
Regards, MAX reverse