Which method is considered incorrect for ground rod installation?

Cutting the rod off at the top if difficult is considered incorrect for ground rod installation because it compromises the effectiveness of the ground rod. Ground rods are designed to extend to a specific depth in order to provide optimal conductivity for grounding purposes. By cutting the rod, the surface area that is in contact with the earth is reduced, which impairs its ability to dissipate electrical currents effectively.

Furthermore, a properly installed ground rod should extend above ground enough to provide a reliable connection point for grounding conductors. Cutting it off can also create safety hazards, as it may leave the top of the rod exposed or cause connections to be less secure. In contrast, driving the rod straight into the ground or using a sledgehammer, while ensuring it is properly installed, are generally acceptable methods. Using a grounded drill for installation is also appropriate, as it can ensure the rod is placed securely and aligns with the requirements of electrical grounding codes.