What is the maximum anticipated fault current values given for protective ground cables, ferrules, and clamps?

The maximum anticipated fault current values given for protective ground cables, ferrules, and clamps are based on the clearing time—which is critical to the safety and effectiveness of grounding systems. The correct choice reflects the standard clearing cycles which indicate the operational capability of these safety devices under fault conditions.

The range of 15 and 30 hertz clearing cycles represents the frequency at which the systems are expected to operate effectively during fault conditions. This means that the designed equipment can handle interruptions and manage heat buildup within that specified frequency range, thus ensuring that the protective ground cables, ferrules, and clamps can realize the necessary thermal and mechanical stability to safely conduct fault currents without failure.

In contrast, the other options suggest frequencies that fall outside the standard clearing cycles for these applications. For example, 60, 50, and 75 hertz clearing cycles do not align with the anticipated operational benchmarks for protective grounding equipment. These frequencies could potentially lead to scenarios where the grounding systems don't function as intended under fault conditions, increasing the risk of equipment damage or safety hazards.