Is the statement, “The grounding electrode conductor for a communications system in a commercial building must be sized using NEC Table 250.66,” true or false?

The statement is false because NEC Table 250.66 specifically provides the requirements for sizing grounding electrode conductors based on the size of the grounding of the service-entrance conductors for electrical systems and is not applicable for communications systems. Communications systems, such as data and telecommunications systems, have different grounding requirements outlined in Article 800 of the National Electrical Code (NEC).

In commercial buildings, the grounding electrodes for communications systems are typically sized according to their unique needs, not necessarily following the specifications found in Table 250.66. Thus, the requirements for grounding electrode conductors for communications systems are separate from those for electrical systems, which validates that the original statement is indeed false.