What is required at each service disconnect for grounded systems?

The requirement at each service disconnect for grounded systems to utilize unspliced main bonding jumpers is critical for maintaining the integrity of the grounding system. Unspliced main bonding jumpers ensure that the neutral conductor is securely bonded to the grounding electrode system at the service disconnect point. This bonds the grounding and neutral systems together, effectively managing fault currents and preventing electrical shock hazards.

Using unspliced jumpers means the connection is continuous and not subject to failure due to potential loose connections that might occur with splices. This ensures a consistent path for ground fault currents and enhances the safety of the electrical system as a whole.

In contrast, disconnecting grounding electrodes, servicing main bonding jumpers, or leaving grounded conductors unbonded could lead to complications in grounding effectiveness, safety risks due to improper fault current paths, and potential code violations. Therefore, the requirement for unspliced main bonding jumpers at each service disconnect is fundamental to ensure a safe and code-compliant grounding system.