Sec.  80.864   Emergency electric lights.

   (a)  Emergency  electric  light(s) must be installed to illuminate the
   operating controls of the radiotelephone installation at the principal
   operating position, the card of instructions, and the radiotelephone station
   clock if the latter is not self-illuminated.

   (b) The emergency electric light(s) must be energized from the reserve power
   supply, if a reserve power supply is required. In cases where a reserve
   power  supply  is not required, the emergency lights must be energized
   independently of the system which supplies the normal lighting.