787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Electrical -
System Description
Copyright © The Boeing Company. See title page for details.
D615Z003-TBC 6.20.5
Electrical Power Distribution and Conversion
The electrical system uses two distinct power distribution methods: primary and
remote. The primary power distribution method energizes higher amperage loads
directly from bus power panels located in the forward and aft E/E bays. The
remote distribution method energizes lower amperage loads through a
decentralized network of 17 Remote Power Distribution Units (RPDUs) located
throughout the airplane.
A limited number of high voltage 235 Vac electrical loads are energized from the
aft E/E bay. The majority of airplane electrical loads are 115 Vac and 28 Vdc,
energized by the forward E/E bay power panels and RPDUs.
The forward and aft E/E bays also contain the main and APU batteries,
respectively. In addition, they contain power conversion devices which change
power from one voltage or current type (AC/DC) to another, and system
controllers that direct power to the various airplane buses and systems.
February 15, 2010
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