What is the maximum length for an equipment bonding jumper installed outside of a raceway?

The maximum length for an equipment bonding jumper installed outside of a raceway is 6 feet. This parameter is specified to ensure the effectiveness and reliability of the grounding system. Bonding jumpers serve to connect various electrical components to a common ground, which is crucial for safety, as it helps prevent electrical shock and ensures that fault currents can safely return to the ground.

Limiting the length of these jumpers is essential because longer lengths can introduce additional resistance and potential differences that might impair the system’s ability to effectively conduct fault currents. Keeping the jumpers within this specified maximum length helps maintain the effectiveness of the bonding connection, ensuring that the equipment remains grounded and protected.

In practical applications, adherents to this guideline ensure compliance with safety codes and standards, thereby promoting electrical safety in installations. The other length options exceed the recommended maximum, which would compromise the effectiveness of electrical bonding practices.