Can rebar extensions that exit from concrete as a concrete-encased electrode be exposed to the earth without corrosion protection?

Concrete-encased electrodes, such as rebar extensions, must not be exposed to direct contact with the earth without corrosion protection. This is primarily due to the potential for corrosion when metal components are in contact with moisture, salts, or other corrosive agents found in soil.

When rebar is embedded in concrete, it is largely protected from the environment due to the alkalinity of the concrete, which creates a passivating layer around the rebar. However, once rebar extends outside of the concrete and is exposed to the elements, it loses this protective environment, making it susceptible to rust and degradation over time.

Thus, to ensure the longevity and functional integrity of the bonding system, any exposed rebar needs to be adequately protected from corrosion, as unprotected rebar could lead to failure in the grounding system. Therefore, the correct answer is that it is false that these extensions can be exposed to earth without corrosion protection.