When should aircraft wiring be installed in a conduit?

• A. When the wiring passes through an area in the aircraft where open wiring could likely be damaged, such as through a wheel well
• B. In all areas
• C. Only behind panels
• D. Never in conduits

Answer: (A)

Wiring should be protected with conduit whenever the route could be damaged if left open. A conduit acts as a rigid shield against abrasion, impact, moisture, and chafing from contact with structure or moving parts, which helps prevent insulation damage and electrical faults. That’s why wiring through high‑risk areas like wheel wells is routed in conduit. In zones where there’s no risk of damage, conduit isn’t required, and the wiring can be run without it, provided it remains adequately protected. The other options would either impose unnecessary protection everywhere or ignore the need for protection in exposed routes.