How does inadequate bonding or grounding affect electrical system reliability?

How does inadequate bonding or grounding affect electrical system reliability?

• A. It has no effect on performance.
• B. It increases electrical resistance.
• C. It can allow electrostatic discharge or lightning to damage sensitive electronic equipment.
• D. It improves system reliability by reducing noise.

Answer: (C)

Bonding and grounding create a common electrical reference and a low-impedance path for transient energy and fault currents. When bonding or grounding is inadequate, metal parts can sit at different potentials, especially during static buildup or a lightning strike. This lets large voltage differences appear between electrical components and structures, which can cause arcing, insulation failure, or surge currents that couple into sensitive avionics. Providing a solid, low-impedance path to ground and tying conductive surfaces together keeps potential differences small and directs transient energy away from delicate equipment, reducing the chance of damage. The other ideas don’t fit because they either ignore the risk of voltage differences, misstate the effect on resistance, or assume reliability improves without addressing how inadequate bonding actually increases exposure to surges and noise.

Bonding and grounding create a common electrical reference and a low-impedance path for transient energy and fault currents. When bonding or grounding is inadequate, metal parts can sit at different potentials, especially during static buildup or a lightning strike. This lets large voltage differences appear between electrical components and structures, which can cause arcing, insulation failure, or surge currents that couple into sensitive avionics. Providing a solid, low-impedance path to ground and tying conductive surfaces together keeps potential differences small and directs transient energy away from delicate equipment, reducing the chance of damage. The other ideas don’t fit because they either ignore the risk of voltage differences, misstate the effect on resistance, or assume reliability improves without addressing how inadequate bonding actually increases exposure to surges and noise.