Which table is used for sizing grounding electrode conductor taps for separately derived systems?

The correct choice relates to Table 250.66, which is specifically utilized for sizing grounding electrode conductors. This table provides guidelines for determining the appropriate size of grounding electrode conductors that connect to a grounding electrode system for separately derived systems.

Separately derived systems, such as transformers, require grounding in a manner that ensures safety and effectiveness in grounding methods. Table 250.66 outlines the minimum sizes based on the rating of the overcurrent device for the source of the separately derived system, making it essential for ensuring optimal protection and compliance with safety standards.

Other tables mentioned address different aspects of grounding and bonding requirements: Table 250.102(C) focuses on bonding jumpers, Table 250.30 pertains to grounding requirements for separately derived systems but is related to the grounding of the system itself rather than the tap conductors, and Table 250.134 deals with grounding of non-current-carrying parts. This context clarifies why Table 250.66 is the appropriate reference for sizing the grounding electrode conductor taps in this scenario.