A building has a concrete-encased electrode and qualifying metal underground water pipe. What is the normal treatment?
- AUse only the concrete electrode and cut the water-pipe bond
- BUse only the water pipe and isolate the concrete electrode
- Bond both into the grounding electrode system
- DBond each electrode to a different downstream neutral
Why C is correct
Electrodes that are present and qualify are generally bonded together as one grounding electrode system. Selecting only one or making downstream neutral bonds can leave conductive systems at different potentials and create objectionable current paths.