What is the minimum conductor size required when a grounding electrode conductor is connected to a concrete-encased electrode?

The minimum conductor size required for a grounding electrode conductor connected to a concrete-encased electrode is 4 AWG. This specification is established by the National Electrical Code (NEC), which outlines the requirements for grounding and bonding.

In the context of grounding systems, concrete-encased electrodes are used to provide an effective grounding method for electrical systems. The size of the grounding electrode conductor is critical for ensuring that it can safely conduct fault currents without overheating or causing damage. The NEC mandates a minimum size of 4 AWG for copper conductors when connecting to such electrodes, ensuring both safety and reliability in the grounding system.

Conductor sizes smaller than 4 AWG, such as 6 AWG or 8 AWG, do not meet the requirements for effective grounding and may pose hazards under fault conditions. Choosing a proper size helps to ensure that the grounding system can effectively dissipate any fault currents, protecting both equipment and human safety.