How far should ground rods be driven into the ground?

Ground rods should typically be driven into the ground until only a few inches remain above the surface to ensure they are effectively connected to the earth for grounding purposes while maintaining accessibility for maintenance and inspections. This placement allows for the rod to function optimally in dissipating electrical energy into the ground, which is crucial for safety and effective operation of electrical systems.

Having a few inches above the surface makes it easier to locate and access the ground rod if repairs or checks are necessary. It strikes a balance between practicality and functionality, as completely burying the rod or having it visible above the surface can hinder either effectiveness or accessibility, respectively.

Driving ground rods until they reach bedrock could be unnecessary and impractical, as ideal grounding doesn't depend on reaching such depths, and it may not be achievable in some soil conditions.