The document describes the electrical system configuration of an Airbus A320 aircraft. In normal configuration, external power can supply the AC and DC ground/flight buses directly without powering the entire aircraft network when only ground services are required. The document also outlines failure scenarios for individual engine generators, AC bus 1, and transformer rectifiers TR1 and TR2, as well as flight operations using only battery power on the ground or in flight at speeds under 50 knots.