What is the maximum spacing interval of clamps supporting wire bundles?

What is the maximum spacing interval of clamps supporting wire bundles?

• A. 12 inches
• B. 18 inches
• C. Not exceeding 24 inches
• D. 36 inches

Answer: (C)

Bundles must be secured often enough to prevent movement that can cause insulation wear or chafing under vibration and thermal cycling in an aircraft. Keeping clamps at close intervals limits how far a bundle can flex along its run, protecting the wires from damage. The standard limit is not to exceed 24 inches between clamps, so the maximum spacing is 24 inches. Spacings like 12 or 18 inches are still acceptable, but they’re not the maximum, while a 36-inch spacing would be too large to provide adequate support.

Bundles must be secured often enough to prevent movement that can cause insulation wear or chafing under vibration and thermal cycling in an aircraft. Keeping clamps at close intervals limits how far a bundle can flex along its run, protecting the wires from damage. The standard limit is not to exceed 24 inches between clamps, so the maximum spacing is 24 inches. Spacings like 12 or 18 inches are still acceptable, but they’re not the maximum, while a 36-inch spacing would be too large to provide adequate support.