Text in force at CS25-28: from CS25-0, effective 17 Oct 2003.
(See AMC 25.1362) A suitable supply must be provided to those services, which are required, in order that emergency procedures may be carried out, after an emergency landing or ditching. The circuits for these services must be so designed, protected and installed such that the risk of their causing a fire, under these conditions, is minimised.
ED Decision 2003/002/RM · Source