friebel
Senior Member
- Location
- Pennsville, N.J.
The sentence in the Section 250.52(A)(1)states that the interior metal water piping located more than 1.52 m (5 ft) from the point of entrance to the building shall not be used as a part of the grounding electrode system or as a conductor to interconnect electrodes that are part of the grounding electrode system.
Exception: The exception reads that it is allowed in industrial and commercial buildings or structures where conditions of maintenance and supervision ensure that only qualified persons service the installation.
My question is as follows:
What is the reason that the interior metal water piping cannot be more than 5 feet from the point of entrance, but it is ok in a place that has qualified persons that service the installation.
Exception: The exception reads that it is allowed in industrial and commercial buildings or structures where conditions of maintenance and supervision ensure that only qualified persons service the installation.
My question is as follows:
What is the reason that the interior metal water piping cannot be more than 5 feet from the point of entrance, but it is ok in a place that has qualified persons that service the installation.