Is it permitted by the Code to use underground metal gas piping systems for grounding electrodes?

Using underground metal gas piping systems for grounding electrodes is not permitted under the National Electrical Code (NEC). This is primarily because gas piping systems can be subject to corrosion and physical damage, which could compromise their integrity and safety. Grounding systems are critical for electrical safety, ensuring that any fault currents are safely dissipated into the ground.

Using gas piping as a grounding electrode poses risks, as the connection may not be reliable over time and could lead to unsafe conditions. The use of dedicated grounding electrodes, such as ground rods or plates, is required to ensure a safe and effective grounding system. This strict regulation ensures that grounding systems are consistent, reliable, and maintain the safety of the electrical installations.