Which statement is NOT a common component of a grounding electrode system?

• A. Plastic conduit
• B. Ground rods
• C. Metal water piping
• D. Building steel

Answer: (A)

Grounding electrode systems provide a direct, low-resistance path to the earth through conductive electrodes. Ground rods, metal water piping, and building steel are common options because they are conductive elements that can be bonded to the electrical system to establish that earth connection. Plastic conduit, on the other hand, is non-conductive and cannot function as a grounding electrode or contribute to the grounding path. It may protect or route conductors, but it does not provide the earth connection required by the grounding electrode system. So plastic conduit is not a common component of the grounding electrode system.