The use of structural metal as a grounding electrode is an issue that has been revised during several recent Code cycles. The 2011 NEC has once again revisited the rule explaining when a structural ...

• The Code prohibits the use of the earth to serve as an effective ground-fault current path [250.4 (A) (5) and 250.4 (B) (4)]. • If the grounding electrode conductor is connected to a ground rod, the ...