For effective grounding, what should the spacing of protective grounds be?

In the context of effective grounding, the correct choice is that protective grounds should be spaced every 2000 feet. This spacing is established to ensure safety and reliability in electrical systems, particularly in minimizing the risk of electrical shock and ensuring that fault currents have a clear and effective path to the ground.

Having protective grounds placed at intervals of 2000 feet helps to maintain a low-resistance path back to the ground, which is crucial during a fault condition. If the grounding system is spaced too far apart, it may not provide sufficient protection, as the resistance may increase and lead to ineffective fault current dissipation. Therefore, the 2000 feet spacing is a standard that balances both safety and engineering design, ensuring that the grounding system is effective over long distances.

Longer spacings, like 3000 or 4000 feet, would increase the risk of high resistance in the grounding plane, which is not ideal for preventing electrical hazards. Hence, the selection of 2000 feet is rooted in creating a robust grounding system that meets safety standards and effectively mitigates risks.