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to 7999.
Four supplementary characters (left justified and
without non significant zero) are used to identify
symetrical or multiple installations.
Example: 1CC1 for FAC 1, 1CC2 for FAC 2.
MAIN BUSBAR IDENTIFICATION
The main busbars are identified using:
- a sequence number,
- letters XP for AC busbars and PP for DC busbars,
- a phase letter (when applicable).
The first number (1 or 2 or 3...) indicates the busbar
number. The letters (XP or PP) indicate the
corresponding power form (alternating current or
direct current).
Example: 1 XP: main alternating current busbar 1.
1 PP: main direct current busbar 1.
1 XP-A: main alternating current busbar 1 phase A
6 PP: direct current service busbar.
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ELECTRICAL SYSTEM AND CIRCUIT IDENTIFICATION
SUB-BUSBAR IDENTIFICATION (CONT’D)
The sub-busbars are identified in the same way as the
main busbar, but with three identification numbers:
- the first is identical to the number of the
corresponding main busbar,
- the two following numbers are the sub-busbar
numbers.
Example: 401 XP is the first sub-busbar of the AC ESS
BUS.
601 PP is the first sub-busbar of the SERVICE BUS.
It should be noted that for the AC network, the thirties
are used for the 26V-400Hz distribution.
Example: 103 XP, 131 XP are sub-busbar of the main
busbar 1XP, but 131 XP is the 26V-400Hz distribution
sub-busbar.
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ELECTRICAL SYSTEM AND CIRCUIT IDENTIFICATION
ARINC BUS IDENTIFICATION
ARINC 429 buses are numbered from 7000 to 7999 with
the ATA 100 prefix of the corresponding system.
An ARINC 429 BUS shielded cable consists of two wires:
one coloured in blue and one coloured in red.
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ELECTRICAL SYSTEM AND CIRCUIT IDENTIFICATION
VIRTUAL BUSBAR IDENTIFICATION
Some circuit breakers do not have their supply on the
busbars of the aircraft distribution network. They are
directly connected to the power source.
In schematic representations, this supply appears as
a virtual busbar.
A virtual busbar is identified as follows:
- 1. a channel number,
- 2. letters IW for virtual busbars followed by
XP for AC busbars or PP for DC busbars.
Example: 1IWXP channel 1 of AC virtual busbar.
1IWPP channel 1 of DC virtual busbar.
Channel 1: consists of 1XP-101XP-103XP-110XP-131XP
1PP-101PP-103PP
3PP-301PP
701PP-703PP
702PP-704PP
901XP
Channel 2: consists of 2XP-202XP-204XP-210XP-212XP
214XP-216XP-231XP
2PP-202PP-204PP-206PP-208PP
501PP-502PP
601PP-602PP
Channel 4: for essential channel,
it consists of: 401XP-431XP
801XP
401PP
801PP
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