The revised Note states that the spacing between driven rods should be at least twice the length of the longer of the two rods. Grounding electrode conductor (GEC) installation The balance of Part III ...

When a separate bonding jumper is installed between the motor terminal housing and a made electrode, such as a driven ground rod of 8 ft length with 2 in. of ground rod exposed above the concrete ...

Specialized grounding techniques have evolved to meet the perceived grounding requirements of electronic equipment performance but sometimes also violate the National Electrical Code (NEC).