Final answer:
The NEC does not specify a specific limit on the number of grounding conductors that can be connected to a grounding electrode by a single listed clamp or fitting.
Step-by-step explanation:
According to the NEC (National Electrical Code), a single listed clamp or fitting can connect multiple grounding conductors to a grounding electrode. However, the NEC does not specify a specific limit on the number of grounding conductors that can be connected. The number of grounding conductors that can be connected depends on the capacity and rating of the clamp or fitting being used.