Which of the following is considered an acceptable grounding electrode?

• A. Plastic conduit
• B. Metal frame of a building
• C. Wooden support posts
• D. Concrete blocks

Answer: (B)

The metal frame of a building is deemed an acceptable grounding electrode due to its conductive properties, which allow for efficient dissipation of electrical energy into the ground. Grounding is crucial for ensuring that any fault currents are safely directed away to minimize the risk of electrical shock, equipment damage, or fire hazards.

In compliance with electrical codes, the metal frame effectively connects to the earth, establishing a low-resistance path for current. This is significant for the overall safety and proper functioning of electrical systems.

The other options do not provide suitable pathways for grounding. Plastic conduit does not conduct electricity, wooden support posts and concrete blocks lack the necessary conductivity to serve effectively as grounding electrodes. Thus, the metal frame stands out as a reliable and compliant choice for grounding within a building’s electrical system.