Wire Protection Techniques

Wire Protection Techniques

1. Separation

   • Essential system wire bundles separated by space
   • Where bundles are in close proximity, separation must still be achieved
   • Prevents effects of faults spreading to other power sources
   • Prevent failure in one redundant system affecting another
   • Avoid electromagnetic interference (EMI) between incompatible circuits
   • Sleeves and shielded wire used when not possible to have physical separation
   • Circuits where separation required, put in different harness assemblies

2. Wiring Segregations or Routes

   • For safety and EMI reasons, electrical wires are installed in physically separated routes
   • Grouped together according to the nature of the wires and the type of signal
   • Six categories
     • G - Generation
     • P - Power Distribution
     • M - Miscellaneous
     • S - Sensitive Cables
     • R - Audio Cables
     • T/U/V - Coaxial Cables
   • Main Routes
     • Installed on opposite sides of the fuselage
   • Secondary Routes
     • Separated by a minimum distance of 25mm unless physical barrier is provided