Quick Answer
Ground rods typically require maintenance over time to ensure effective grounding.
Ground Rod Conditions
Ground rods can degrade due to corrosion caused by moisture, soil composition, and electrolyte activity. Over time, a ground rod can corrode to a point where it’s ineffective at providing a reliable path to ground. A general rule of thumb is to inspect ground rods every 5-10 years, or sooner if signs of corrosion are visible.
Ground Rod Testing and Replacement
To test a ground rod, use a ground resistance tester, such as a fall-of-potential (FOP) tester or a ground resistance meter. Readings above 10 ohms, for example, can indicate corrosion or poor grounding. If the reading is high, consider replacing the ground rod with a new one made of a corrosion-resistant material, such as galvanized steel or stainless steel.
Maintaining Ground Rods
To maintain ground rods, use a process called “driving” or “re-driving” the rod. This involves driving a new ground rod next to the existing one, then connecting the existing rod to the new one. This method can help to replace the corroded section of the original rod with a new, usable section.
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