14 C.F.R. § 23.1367 Switches.
Title 14 - Aeronautics and Space
Each switch must be— (a) Able to carry its rated current; (b) Constructed with enough distance or insulating material between current carrying parts and the housing so that vibration in flight will not cause shorting; (c) Accessible to appropriate flight crewmembers; and (d) Labeled as to operation and the circuit controlled.
Title 14: Aeronautics and Space
PART 23—AIRWORTHINESS STANDARDS: NORMAL, UTILITY, ACROBATIC, AND COMMUTER CATEGORY AIRPLANES
Subpart F—Equipment
Electrical Systems and Equipment
§ 23.1367 Switches.