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<br />gro-qnded. <br /> <br />(c) Concrete-Encased Electrode. An electrode encased by at least 2 in. (50.8 nun) of concrete, located within <br />and near the bottom of a concrete foundation or footing that is in direct contact with the earth, consisting of at <br />least 20 :ft (6.1 m) of one or more bare or zinc galvanized or other electrically conductive coated steel <br />reinforcing bars or rods of not less than ~-in. (12.7-mm) diameter, or consisting of at least 20:ft (6.1 m) of bare <br />copper conductor not smaller than No.4. Reinforcing bars shall be permitted to be bonded together by the usual <br />steel tie wires or other effective means. .;-^..M^^~^.M.'._..I <br />'iC_ftM:a'~:.. <br /> <br />(d) Ground Ring. A ground ring encircling the building or structure, in direct contact with the earth at a depth <br />below the earth's surface of not less than 2~ :ft (762 mm), consisting of at least 2.0 ft (6.1 m) of bare copper <br />conductor not smaller than No. 2'C.mii.nta'~1 <br />