A320 Electrical Schematic
 

The A320 electrical schematic (DSC-24-10-10) mentions the following terminology:

AC BUS 1 (1XP)
AC BUS 2 (2XP)
AC ESS (4XP)
AC STAT INV (9XP)
DC BUS 1 (1PP)

What is 1XP 2XP 1PP

Looks like the FIN. (Functional Item Number).

As TURIN says. The following is the explanation from the training manual: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. XP for alternating Current and PP for Direct Current.

Example: - 1XP: main alternating current busbar 1(MAIN AC BUS 1),

- 1PP: main direct current busbar 1 (MAIN DC BUS 1),

- 1XP-A: MAIN AC BUS 1 phase A,

- 6PP: direct current service busbar (DC SVCE BUS).

SUB-BUSBAR IDENTIFICATION

The sub-busbars are identified in the same way as the main busbar, but with three identification digits: - the first is identical to the number of the corresponding main busbar, - the two following digits are the sub-busbar numbers.

Example:

- 401XP is the first sub-busbar of the AC ESS BUS,

- 601PP 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-400 Hz distribution. Example: 103XP, are sub-busbar of the main busbar 1XP, but 131XP is the 26V-400 Hz distribution sub-busbar.

Thanks a ton QA1 .... makes sense now

Thanks Turin