2). • Ground ring consisting of at least 20 ft of bare copper conductor not smaller than 2 AWG buried in the earth encircling a building [250.52(A)(4)]. • Rod electrode with at least 8 ft in length in ...

A direct-buried bare copper conductor at least 2 AWG encircling a building can serve as a grounding electrode [Sec. 250.52(A)(4)]. A ground ring encircling a building must be at least 30 in. below the ...