Downloaded from https://www.everyspec.com MIL-STD-1808B SYSTEM SUB-SYSTEM TITLE DEFINITION 24 ELECTRICAL POWER The subsystem components used to generate, control, and supply alternating current (ac) or direct current (dc) electrical power for other systems, including generators and relays, inverters, batteries, etc., through the secondary busses. Also includes units and components that provide multiplexing of electrical power and common electrical wiring, switches, connectors, etc. 00 GENERAL 10 CONSTANT SPEED DRIVE The mechanical portion of the system that drives the generators at a desired, constant revolutions per minute (RPM).
Includes oil system, connecting devices, indicating, and warning systems for the drive, ram turbine, etc. 20 AC GENERATION The portion of the system used to generate, regulate, control, and indicate ac electrical power. Includes inverters, ac generators and alternators, control and regulating components, indicating systems, and all wiring, except to main busses. 30 DC GENERATION The portion of the system used to generate, regulate, control, and indicate dc electrical power. Includes dc generators and alternators, transformers, rectifiers, batteries, control and regulating components, indicating systems, and all wiring, except to main busses.
40 EXTERNAL POWER The portion of the system within the aircraft that connects external electrical power to the aircraft’s electrical system. Includes receptacles, relays, switches, wiring, warning lights, etc. 50 AC ELECTRICAL LOAD DISTRIBU- TION The portion of the system that provides for connection of ac power to using systems. Includes ac main and secondary busses, main system circuit breakers, power system devices, etc. 60 DC ELECTRICAL LOAD DISTRIBU- TION The portion of the system that provides for connection of dc power to the using systems. Includes dc main and secondary busses, main system circuit breakers, power system devices, etc.
70 ELECTRICAL MONITORING AND PROTECTION The portion of the system used to supply aircraft or ground power for use of the ground power switching system, avionics low cooling protection system, essential 28 vdc bus monitoring system and system monitoring. Includes aircraft grounding receptacles. 80 EMERGENCY GENERATION The portion of the system that provides generation of emergency electrical power in the event of main electrical system generator failure or loss of engine power. 27