What are two acceptable types of cords used for bundling wire together?

• A. Cotton and nylon
• B. Silk and cotton
• C. Nylon and polyester
• D. Cotton and polyester

Answer: (A)

Bundling wire requires nonconductive cords that won’t irritate insulation or create a short. Cotton and nylon meet that need. Cotton is a soft, nonconductive fiber that won’t abrade insulation as you tie wires, making it gentle on the bundle. Nylon adds strength and durability, with good resistance to abrasion and moisture, so knots stay secure in the vibrations and conditions typical of aircraft wiring. Other fibers may lack the needed balance of softness, strength, or long-term durability, so cotton and nylon are the practical, acceptable choices for tying bundles.