Which range represents the acceptable diameter for a wire bundle?

• A. 1.0 to 1.5 inches
• B. 2.0 to 2.5 inches
• C. 1.5 to 2.0 inches
• D. 0.5 to 1.0 inches

Answer: (C)

Bundles of wires are kept within a defined diameter so they fit properly in the harness routes, clamps, and connectors, and so heat and movement don’t damage the insulation. The 1.5 to 2.0 inch range represents a size that can contain the typical number of conductors with standard insulation and any protective sleeving, while still leaving room to route the bundle without interference. If the bundle is too small, wires can be crushed or insulation damaged from tight packing and the bundle may be hard to secure reliably. If it’s too large, the bundle may not fit in the designated channel or clamp, could rub against nearby components, and become difficult to move or service. When checking, measure the widest point of the bundled wires with everything in place and secured, using a bundle gauge or calipers to ensure you’re within the specified range.