250.53 Grounding Electrode Installation.
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Grounding electrodes such as ground rods must be spaced at least 6 ft. apart.
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Grounding electrodes such as ground rods must be spaced at least 6 ft. apart.

There are a number of requirements in this section about how to install the grounding electrode system:

When 2 ground rods or ground plates are installed, they must be at least 6 ft. apart and bonded together.

Bonding jumpers that connect grounding electrodes are bonding jumpers, not grounding electrode conductors.  Grounding electrode conductors must be continuous.  Bonding jumpers used to connect grounding electrodes together are not required to be continuous.

When metal water pipe is used as a grounding electrode, bonding jumpers must be installed around water meters and water filters. An additional grounding electrode in addition to the metal underground water pipe must be installed to supplement the water pipe.

If the supplemental electrode is a rod, pipe or plate, the grounding electrode conductor which connects to it does not have to be larger than No. 6 AWG.

A driven ground rod must be buried at least 8 ft. in the ground. With an 8 ft. ground rod, the connection to the grounding electrode conductor must be made flush with the ground or below ground. If bedrock is hit when driving the rod, it may be installed at a 45 degree angle.  When driving the rod at a 45 degree angle, if bedrock still prevents the rod from being driven, the ground rod may be buried in a trench which is at least 30 inches deep.

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Electrical Continuing Education for License Renewal: 250.53 Grounding Electrode Installation. Question
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