Is a bonding jumper required from the ground bar to a set-screw connector in a specific installation scenario?

In a specific installation scenario, a bonding jumper from the ground bar to a set-screw connector is indeed required to ensure electrical safety and proper grounding. The primary objective of a bonding jumper is to create a low-resistance path to ground, thereby preventing potential differences that could lead to dangerous electric shock or equipment damage.

When a set-screw connector is utilized, it typically holds wires or conductors securely within an enclosure. However, establishing a reliable ground path from the ground bar to the set-screw connector is essential because the connector itself may not provide good conductivity due to factors like corrosion or the loosening of the connection over time. The bonding jumper acts as a safeguard, ensuring that even if the set-screw connection fails, there is still a secure ground connection in place.

Additionally, the National Electrical Code (NEC) often mandates bonding jumper requirements for various components to ensure a comprehensive grounding system. This helps in maintaining the integrity of the entire electrical system, minimizing shock hazards and enhancing system reliability.

On the other hand, not incorporating a bonding jumper could compromise safety measures and violate electrical code requirements, leading to increased risks in the installation. Therefore, the requirement for a bonding jumper in this context reinforces best practices in electrical installations.