Electric architecture for a rotorcraft with hybrid motorisation and Method

The aircraft (1) has a main combustion engine (6) e.g. oil engine, and an auxiliary electric machine (7) that are mechanically coupled to a power train (8). The power train drives a main rotor (3), in rotation, of a hybrid motorization assembly (5). The hybrid motorization assembly comprises a hybridization system (37) with an auxiliary electrical wiring system (34). A main electric bus (35) and an auxiliary electric bus (36) are connected by a selective adaptation surface (38) such that an electrical wiring system (16) and the auxiliary electrical wiring system are electrically distinctible. An independent claim is also included for a method for operating an aircraft.