Concrete-encased electrodes do not need to be part of the grounding electrode system in which type of buildings?

Concrete-encased electrodes are typically required to be part of the grounding electrode system in many types of buildings; however, there is specific guidance regarding existing buildings. In the case of existing structures, the code often allows for some flexibility. As these buildings may not have been designed with certain modern grounding practices at the time of their construction, the concrete-encased electrodes can be omitted from the grounding system if other grounding methods are being utilized effectively.

This is important because existing buildings may already have grounding systems in place that sufficiently meet safety and electrical code requirements. Therefore, the need to incorporate new electrodes may not be deemed necessary for compliance, thus allowing for different interpretations of the grounding system in existing buildings.

In contrast, new constructions, temporary structures, and high-rise buildings often have stricter grounding electrode requirements due to the increased potential for electrical hazards and the need for enhanced safety protocols in these contexts.