What is the maximum distance an interior metal water piping system can be from the point of entrance to connect grounding electrodes?

The maximum distance an interior metal water piping system can be from the point of entrance to connect grounding electrodes is 5 feet. This requirement is established to ensure effective grounding and bonding of the electrical system, which is critical for safety. When metal water piping is used as a grounding electrode, the connection must be made as close as possible to the point where the piping enters the building, which typically is within 5 feet. This proximity minimizes the risk of differences in electrical potential that can occur if the distance is greater, thereby reducing the chance of electrical shock hazards or damage to equipment. Keeping the bonding connection close helps ensure a low-resistance path to ground, improving the overall effectiveness of the grounding system.