Page 10 - excerpts ELP

Static/Shielding Wire
This conductor is installed on transmission lines in areas that are exposed
to lightning. It can consist of one or two conductors that are positioned above the phase conductors on the structure. They are grounded by various methods, depending upon the structure type and the design of the line.
Doubling the length of the ground rod into the earth will typically decrease ground resistance by 40% while doubling its diameter only reduces resistance by 10%.
Ground wire
(connected to static/shield wire)
Static/shield wire
Driven Ground Rod
This is typically a 5/8- or 3/4-inch ground rod that is driven into the earth as deep as practical. The ground rod can be viewed as a sprinkler system spewing out water through many holes or paths. By penetrating the earth, the ground rod provides many paths for the ow of electrons, and the more paths that are provided, the less resistance.
It is also important to note that a seasonal temperature change from 68 to 23 degrees F will increase soil resistance by a factor of 10, due to freezing.
LEARN MORE 2:47
Ground Rod Resistance
lcvid.com/groundrod
The ground rod should be driven as deep as possible to reduce overall resistance.
Correct
Incorrect
GENERAL INFORMATION | CHAPTER TWO
Static/shielding wire
(may be steel conductor or ber optic cable)
NORTHWEST LINEMAN COLLEGE 47