What is necessary to ensure the bond of multiple raceways when they enter or leave a junction box?

To ensure the bond of multiple raceways when they enter or leave a junction box, using a single appropriately sized conductor is essential. This method effectively connects all raceways to a common grounding point, ensuring a continuous path for electrical current. An appropriately sized conductor is designed to handle the potential fault currents that may flow through the system, preventing dangerous situations such as electrical shock or fire that could occur if a poor or insufficient connection were made.

In installations involving multiple raceways, treating the system as a unified entity with a single conductor for bonding simplifies the process and guarantees that all raceways maintain a low-resistance path to ground. This approach also aligns well with the principles outlined in electrical codes, emphasizing safety and operational reliability.

While other options may serve specific purposes in grounding applications, they do not provide the same level of assurance for the bond required for multiple raceways at a junction box. For instance, separate jumpers could lead to inconsistencies and increased complexity in connections, while metal straps and bonding clamps may be useful for securing physical connections but do not offer the same level of electrical continuity as a single conductor. Thus, an appropriately sized conductor is the most effective choice for proper bonding in this scenario.