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Refer to figure.
On ground, external power (EXT PWR) can be used to feed the AC BUS 1, when: (NB: all contactors not mentioned are assumed to remain open)
  • A
    C1.1 and C2.1 are closed.
  • B
    C1.2 and C2.2 are closed.
  • C
    C2.1 and C2.2 are closed.
  • D
    C1.2 and C2.1 are closed.

Refer to figure.
EXT PWR can feed AC BUS 1 when contactors C1.2 and C2.1 are closed.

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