14 CFR § 25.1362
Electrical supplies for emergency conditions
July 13, 2020
A suitable electrical supply must be provided to those services required for emergency procedures after an emergency landing or ditching. The circuits for these services must be designed, protected, and installed so that the risk of the services being rendered ineffective under these emergency conditions is minimized.
[Amdt. 25-123, 72 FR 63406, Nov. 8, 2007]