Elec. isolation A320
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Don't know about the Airbus, but separate elec. sources for each of the three autopilots were required in the US for the 757 Cat 3b autoland certification, from what I remember. The third source was from the hot battery bus, or some bus using battery juice. Don't believe this was required for Cat 2 (touchdown zone at least 1200 RVR) certification. Somebody at Pprune will know about the Airbus...I'm back on a 'steam-gauge' (we can thump oil press, N1 gauges with a mocha-stained finger to wake them up!), fly-by-cable- directly-to-control-tabs/rudder boost machine.