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panel (PDP) in the EE compartment. The wires have these four
connections:
* IDG
* Engine strut firewall
* Strut/wing interface
* Back of the PDPs.
IDG feeder wires go from the strut, along the wing front spar,
and into the fuselage. The wires go through the lower part of the
fuselage to the back of the PDPs.
APU Wire Routing
The APU feeder wires go from the APU starter-generator to the
PDPs. The wires have these two connections:
* APU starter-generator
* PDP 1.
The APU feeder wires route along the top of the fuselage.
External Power
External power feeder wires go from the external power
connector, through the lower fuselage to PDP 2. These are the
two connections:
* External power connector
* Back of PDP 2.
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AC GENERATION - AC SOURCE FEEDER WIRE ROUTING - GENERAL DESCRIPTION
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P6 and P18 Panels
The P6 and P18 panels in the flight compartment have most of
the airplane system load circuit breakers. These are a few of
the panel components:
* Thermal circuit breakers
* Relays
* Diodes
* Wiring.
Each circuit breaker panel contains several sub-panels (doors)
that open. Circuit breakers are on the face of the sub-panels.
You open the sub-panels to get access to the other components.
The P6 has six sub-panels and the standby power control unit
(SPCU). The P18 has three sub-panels.
Electronic Equipment Compartment
The electronic equipment (EE) compartment contains these
electrical items:
* Modules (black boxes)
* Power distribution panels (PDPs)
* Aircraft battery
* Relays.
Access to the EE compartment is through a door aft of the nose
wheel well at the bottom of the fuselage.
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E4 Rack Components
The E4 rack has these components that are in the AC
generation system or have interfaces with the system:
* Bus power control unit (BPCU)
* Power distribution panel 2, (PDP 2 or P92)
* Generator control unit 2 (GCU 2).
E2 Rack Components
The E2 rack has these components that are in the AC
generation system or have interfaces with the system:
* APU generator control unit (AGCU)
* Generator control unit 1 (GCU 1)
* APU start converter unit (SCU)
* Power distribution panel 1 (PDP 1 or P91).
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General Description
The electrical system has many junction boxes (J). The junction
boxes contain many relays for different AC and DC loads on the
airplane.
Most of the junction boxes are in the EE compartment or in the
forward fuselage, below the flight compartment. These are the
major junction boxes on the airplane:
* J4
* J5
* J9
* J20
* J22
* J23
* J24.
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