What is the minimum length of contact required for a metal in-ground support structure to qualify as a grounding electrode?

The minimum length of contact required for a metal in-ground support structure to qualify as a grounding electrode is indeed 10 feet. This specification is based on the National Electrical Code (NEC) requirements, which dictate that a grounding electrode must make sufficient physical contact with the Earth to effectively dissipate electrical faults and provide safety.

A grounding electrode, such as a metal in-ground support structure, must have a minimum length to ensure that it is adequately grounded. The intention is to provide a reliable path for fault currents and to stabilize the electrical system's voltage during faults. By meeting or exceeding this 10-foot requirement, the grounding electrode can efficiently engage with the surrounding soil, lessening the risk of electrical hazards and enhancing the overall safety of the electrical installation.