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A single rod, pipe, or plate electrode shall be supplemented by an additional electrode of a type specified in 250.52(A)(2) through (A)(8). The supplemental electrode shall be permitted to be bonded to one of the following:
  1. Rod, pipe, or plate electrode
  2. Grounding electrode conductor
  3. Grounded service-entrance conductor
  4. Nonflexible grounded service raceway
  5. Any grounded service enclosure
Exception: If a single rod, pipe, or plate grounding electrode has a resistance to earth of 25 ohms or less, the supplemental electrode shall not be required.

Related Code Sections

250.53 Wiring and Protection, Grounding Electrode System Installation
: If a single rod, pipe, or plate grounding electrode has a resistance to earth of 25 ohms or less, the supplemental electrode shall not be required ...
250.53 Wiring and Protection, Grounding Electrode System Installation
: If a single rod, pipe, or plate grounding electrode has a resistance to earth of 25 ohms or less, the supplemental electrode shall not be required ...
(A) Wiring and Protection, Rod, Pipe, and Plate Electrodes
: If a single rod, pipe, or plate grounding electrode has a resistance to earth of 25 ohms or less, the supplemental electrode shall not be required ...