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<br />'shaH be permitted to be bonded to the grounding electrode conductor, the grounded service-entrance condrictor, <br />the nonflexible grounded service raceway, or any grounded service enclosure. C--t.'!lf <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 (d), 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--t.'!ll <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 ~-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, C--t4lf!l1 <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 rom), consisting of at least 20 ft (6.1 m) of bare copper <br />conductor not smaller than No.2. C__t.'!l1 <br />