Quiz: Building From the Ground Up

Grounding rules for AC substations are provided in Part X of NEC Article 250. Substations are generally covered by NEC requirements, if not exempted by Section 90.2(B)(5), which addresses installations under the exclusive control of the utility. Not all substations fall into that category. The NEC also includes many rules for medium- and high-voltage installations. Since it is a work in progress, expansion of coverage in this area continues.

Created by: Michael Johnston