If more than one BPU is installed, which copper ground conductor grid cable size must be used?

The requirement for the copper ground conductor grid cable size is based on safety standards and electrical code regulations. In situations where multiple Bonding Plane Units (BPUs) are installed, it is critical to ensure that the grounding conductor is robust enough to handle possible fault currents while maintaining system integrity.

Using a #2 AWG copper ground conductor is aligned with these safety and performance standards, as it provides sufficient capacity to handle electrical surges without overheating or failing. This size ensures that the system is adequately grounded, minimizing the risk of electrical shock and equipment damage during fault conditions.

Other conductor sizes, such as #4 AWG, #6 AWG, and #8 AWG, do not offer the same level of conductivity and mechanical strength required for grounding in scenarios with multiple BPUs. These smaller sizes may not comply with the necessary standards for current-carrying capacity and could lead to safety hazards in the electrical system. Thus, the use of #2 AWG as the specified size enhances the overall safety and reliability of the electrical installation.