The purpose of a ground rod is to provide a low impedance path to earth in the event a power line is hit by lightning. All the rods in the area provide an earth mesh.
The Earth Safety is to carry no current EXCEPT IN THE EVENT OF AN ELECTRICAL FAILURE! The fault current is returned to the neutral, NOT the ground rod.
Adding a ground rod will do nothing to cure ground loop noise because the loop still exists and depending on the installation with a different, possibly higher earth impedance.
Theoretically, one ground rod with a 1-inch diameter driven in homogeneous 1,000-ohm per meter (ohm/meter) soil for one meter would yield 765 ohms. Driving it two meters into the soil would give 437 ohms. Going to three meters, however, does not give as great a change (309 ohms). One would get faster ohmic reduction and easier installation by using three rods, each one meter long, giving 230 ohms compared to that of one rod three meters long. This assumes they are spaced “greater than the sum of their lengths apart”.
see https://www.polyphaser.com/News/DownloadFile?downloadGuid=25400030-29fb-4981-862f-c24c4118b556
Adding additional rods can be detrimental depending on rod material, soil moisture and pH. Improperly done, a battery is created which will destroy one rod. Too close and the rod effectiveness is diminished.
The Earth Safety is to carry no current EXCEPT IN THE EVENT OF AN ELECTRICAL FAILURE! The fault current is returned to the neutral, NOT the ground rod.
Adding a ground rod will do nothing to cure ground loop noise because the loop still exists and depending on the installation with a different, possibly higher earth impedance.
Theoretically, one ground rod with a 1-inch diameter driven in homogeneous 1,000-ohm per meter (ohm/meter) soil for one meter would yield 765 ohms. Driving it two meters into the soil would give 437 ohms. Going to three meters, however, does not give as great a change (309 ohms). One would get faster ohmic reduction and easier installation by using three rods, each one meter long, giving 230 ohms compared to that of one rod three meters long. This assumes they are spaced “greater than the sum of their lengths apart”.
see https://www.polyphaser.com/News/DownloadFile?downloadGuid=25400030-29fb-4981-862f-c24c4118b556
Adding additional rods can be detrimental depending on rod material, soil moisture and pH. Improperly done, a battery is created which will destroy one rod. Too close and the rod effectiveness is diminished.