According to electrical codes, how should grounding electrodes be treated when made of RMC?

Grounding electrodes are crucial for ensuring safety in electrical systems by preventing electrical shock and equipment damage. When it comes to grounding electrodes made of rigid metal conduit (RMC), the applicable electrical codes specify certain conditions under which they may or may not be used.

RMC is not recognized as a suitable grounding electrode material on its own because it can be subject to corrosion and physical damage. The code typically requires grounding electrodes to be made from materials that provide reliable conductivity and durability over time. Therefore, the option stating that grounding electrodes made of RMC shall not be permitted is correct.

This restriction ensures that grounding systems remain effective in providing a safe electrical path in case of faults, which is a critical consideration for electrical installations. By enforcing these standards, it enhances the overall safety and reliability of electrical systems.