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<br />shall be permitted to be bonded to the grounding electrode conductor, the grounded service-entrance conductor, <br />tb~ Ilonfiexible grounded service raceway, or any groWlded service enclosure. . C~t;91 <br /> <br />Exception: The supplemental electrode shall be permitted to be bonded to the interior metal water piping at <br />any convenient point as covered in Section 250-50, Exception. <br /> <br />Where the supplemental electrode is a made electrode as in Section 250-52(c) or Cd), that portion of the bonding <br />jumper that is the sole connection to the supplemental grounding electrode shall not be required to be larger than <br />No.6 copper wire or No.4 aluminum wire.c---a.vJ <br /> <br />(b) Metal Frame of the Building or Structure. The metal frame of the building or structure, where effectively <br />grounded. <br /> <br />(c) Concrete-Encased Electrode. An electrode encased by at least 2 in. (50.8 mm) 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 Y2-in. (12.7-mm) diameter, or consisting of at least 20 ft (6.1 m) ofbare <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.c~tif9~ <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 2Y2 ft (762 mm), consisting of at least 20 ft (6.1 m) ofbare copper <br />conductor not smaller than No. 2.c:o....n__,~ <br />