Which statement best describes proper use of clamps for wire bundles?

• A. They must fit without crushing the cable and be snug enough to prevent movement while allowing slight axial sliding.
• B. They must be painted bright red for visibility.
• C. They must be extremely heavy to ensure stability.
• D. They should be as cheap as possible.

Answer: (A)

Secure wire bundles with clamps that fit the bundle without pinching the insulation. The clamp should grip firmly enough to prevent movement, but allow a little axial sliding so the wires can shift with vibration and thermal expansion and contraction. This combination protects insulation from being crushed or worn, prevents strain on terminations, and keeps the bundle routed neatly. Color, weight, or cost don’t address these safety and reliability needs, whereas a properly sized clamp does.