Text in force at CS27-10: from CS27-0, effective 14 Nov 2003.
(a) Each electric connecting cable must be of adequate capacity.
(b) Each cable that would overheat in the event of circuit overload or fault must be at least flame resistant and may not emit dangerous quantities of toxic fumes.
(c) Insulation on electrical wire and cable installed in the rotorcraft must be self-extinguishing when tested in accordance with CS–25, appendix F, part I (a)(3).
ED Decision 2003/015/RM · Source