Canadian Aviation Regulations
(2) No person shall operate a multi-engined aircraft in IMC unless the aircraft is equipped with
(a) two generators or two alternators, each of which is driven by a separate engine or by a rotor drive train; and
(b) two independent sources of energy, at least one of which is not a battery, and each of which is able to drive all flight instruments requiring a source of energy and is installed so that the failure of one instrument or one source of energy will affect neither the energy supply to the remaining instruments nor the other source of energy.
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