Final answer:
The minimum length allowed for driven ground rods under normal conditions is typically 8 feet or 2.4 meters.
Step-by-step explanation:
The minimum length allowed for driven ground rods under normal conditions is typically 8 feet or 2.4 meters. This length is important to ensure proper grounding and to avoid electrical hazards. Ground rods are used to redirect electrical current safely into the ground, and their length is determined by industry standards and electrical codes.