Which type of electrode's size requirement can be waived if it does not connect to larger size conductors?

Concrete-encased electrodes can have their size requirements waived if they do not connect to larger size conductors. This is due to the nature of how grounding is achieved with these types of electrodes. A concrete-encased electrode, often consisting of rebar, is embedded in a concrete structure and inherently provides good conductivity due to the properties of the rebar and the concrete itself.

The reasoning behind allowing the waiver of size requirements is that the effectiveness of these electrodes for grounding does not necessarily depend on their physical size when they are not directly connected to larger conductors. Instead, their capacity to safely dissipate electrical charges is influenced by their placement and the overall grounding system design.

The other electrode types listed have specific size requirements due to different considerations, such as the need for a greater surface area for effective grounding, or the direct connection to larger conductors that require maintaining a minimum size. Understanding these distinctions helps in adhering to electrical codes and ensuring effective grounding practices.