Motorola Standards and Guidelines for Communication Sites (R56) Practice Test

Ground rods should be spaced apart by at least the length of a rod. This spacing helps each rod contribute its own independent grounding path, reducing the overall ground resistance as more rods are added. If rods are placed too close together, their electrical fields overlap and the rods act more like a single electrode, offering less improvement in grounding performance. In practice, using common rod lengths (for example, 8 ft or 10 ft), you would space successive rods by roughly that same length. The other options set distances that aren’t the standard guidance: too far apart can be unnecessary and impractical, and no spacing would undermine the effectiveness of multiple rods.