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User and
Installation Guide
(f) Electrode. The grounding conductor shall be connected as follows:
(1) To the nearest accessible location on the building or structure grounding electrode
system as covered in Section 250-81, (2) the grounded interior metal water piping
system as covered in Section 250-80(a), (3) the power service accessible means
external to enclosures as covered in Section 250-71(b), (4) the metallic power
service raceway, (5) the service equipment enclosure, or (6) the grounding electrode
conductor or the grounding electrode conductor metal enclosures; or
(2) If the building or structure served has no grounding means, as described in (f)(1), to
any one of the individual electrodes described in Section 250-81; or
(3) If the building or structure served has no grounding means, as described in (f)(1) or
(f)(2), to (1) an effectively grounded metal structure or (2) to any of the individual
electrodes described in Section 250-83.
(g) Inside or Outside Building. The grounding conductor shall be permitted to be run either
inside or outside the building.
(h) Size. The grounding conductor shall not be smaller than No. 10 copper or No. 8
aluminum or No. 17 copper-clad steel or bronze.
(i) Common ground. A single grounding conductor shall be permitted for both protective
and operating purposes.
(j) Bonding of Electrodes. A bonding jumper not smaller than No. 6 copper or equivalent
shall be connected between the radio and television equipment grounding electrode and
the power grounding electrode system at the building or structure served where separate
electrodes are used.