What should be done to protect wires from chafing when passing through bulkheads?

Installing a grommet is an effective method for protecting wires from chafing when they pass through bulkheads. A grommet creates a smooth, protective edge around the hole where the wires exit or enter a bulkhead. This prevents the sharp edges of the metal or composite material from rubbing against the insulation of the wires, which could lead to wear, fraying, or eventual electrical short circuits.

Grommets not only serve as a physical barrier to protect the wires but also help to secure them in place, ensuring that they do not shift or move excessively. This is especially critical in aircraft applications, where vibrations and movements are common, and maintaining the integrity of electrical connections is paramount for safety and functionality.

In contrast, while metal sheathing, tape, or heat shrink tubing can offer some degree of protection, they are not specifically designed to mitigate chafing in bulkhead applications. Metal sheathing may not provide the flexibility needed for movement, and tape can wear off or become loose over time. Heat shrink tubing is useful for insulating and protecting individual wires, but it does not address the issue of protection at the transition points through bulkheads. Thus, utilizing a grommet is the most suitable choice for this specific scenario.