If connected to a metal water piping system, the grounding electrode conductor must be connected within the first what distance of where it enters the building?

The grounding electrode conductor must be connected within the first 5 feet of where it enters the building when connected to a metal water piping system. This requirement is crucial for ensuring that the grounding system provides an effective path for fault currents, thereby enhancing the safety of the electrical system and minimizing the risk of electrical shock or fire.

By establishing the connection within this distance, it ensures that the grounding electrode is close to the point of entrance of the water pipe, which is important for maintaining the integrity of the grounding system. If the connection were to be made further away, it could potentially introduce additional resistance and could compromise the effectiveness of the grounding system, increasing the risk of electrical hazards.

In addition, the 5-foot guideline aligns with National Electrical Code (NEC) requirements, which helps standardize electrical installations for safety and functionality. This helps ensure that the grounding connection is robust and reliable, serving its intended purpose effectively.