If it is desirable to use wire sizes smaller than gauge 20, what must be given particular attention?

If it is desirable to use wire sizes smaller than gauge 20, what must be given particular attention?

• A. Mechanical strength and installation handling
• B. Color coding
• C. Temperature rating
• D. Shielding

Answer: (A)

Using wire sizes smaller than gauge 20 makes the conductors more delicate. Their insulation and strands are thinner, so they are easier to nick, kink, or break when routed through an aircraft’s structure or subjected to vibration. Because of this, the most important thing to watch is mechanical strength and installation handling. Provide robust supports and strain relief, use protective sleeving or conduit where needed, maintain adequate bend radii to avoid kinking, and secure the wires so they don’t rub against sharp edges or move excessively in flight. Color coding or shielding aren’t the primary concerns for this situation, and while temperature ratings matter for insulation performance, the key issue introduced by smaller wires is preventing mechanical damage through proper installation practices.

Using wire sizes smaller than gauge 20 makes the conductors more delicate. Their insulation and strands are thinner, so they are easier to nick, kink, or break when routed through an aircraft’s structure or subjected to vibration. Because of this, the most important thing to watch is mechanical strength and installation handling. Provide robust supports and strain relief, use protective sleeving or conduit where needed, maintain adequate bend radii to avoid kinking, and secure the wires so they don’t rub against sharp edges or move excessively in flight. Color coding or shielding aren’t the primary concerns for this situation, and while temperature ratings matter for insulation performance, the key issue introduced by smaller wires is preventing mechanical damage through proper installation practices.