When dealing with multiple grounding electrodes, the bonding jumper must be sized according to which table?

The correct choice for sizing the bonding jumper when dealing with multiple grounding electrodes is indeed based on Table 250.102. This table specifically provides the necessary guidelines for determining the size of grounding conductors and bonding jumpers that connect different grounding electrodes.

In systems where multiple grounding electrodes are involved, it is crucial to ensure that the bonding jumper is appropriately sized to effectively limit the voltage between the electrodes and provide a reliable path for fault currents. Table 250.102 addresses various configurations and sizing requirements for bonding jumpers to make sure they meet the National Electrical Code standards.

Each of the other tables listed addresses different aspects of grounding and bonding requirements. For instance, Table 250.66 is used for sizing grounding conductors based on the largest ungrounded conductors in a system, while Table 250.122 pertains to sizing equipment grounding conductors based on the rating of overcurrent devices. Table 250.123 is specific to supplementary grounding conductors, which doesn't apply in the context of this question regarding multiple grounding electrodes.

Thus, referencing Table 250.102 for sizing the bonding jumper ensures compliance with the appropriate standards and enhances the effectiveness of grounding systems.