What should be used for cables that pass through bulkhead holes?

• A. Clamps
• B. Grommets
• C. Heat shrink
• D. Tape

Answer: (B)

Cables passing through bulkhead holes need protection from sharp edges and movement, and a grommet provides exactly that. It lines the hole with a flexible, smooth surface, cushions the cable insulation from the metal edge, reduces wear and chafing, and can help seal the opening against moisture and dust. Clamps hold a bundle in place but don’t protect the edge of the hole; heat shrink is used to insulate or seal individual conductors or splices rather than to line a hole; tape isn’t durable or reliable for this purpose.