Application Note
For all applications, this is not a true ground
resistance measurement because of the network
ground. This is mainly a continuity test to verify
that the site is grounded, that we have an elec-
trical connection, and that the system can pass
current.
3-pole Fall-of-Potential measurement
Second, we measure the resistance of the entire
system via the 3-pole Fall-of-Potential method.
Keep in mind the rules for stake setting. This
measurement should be recorded and measure-
ments should take place at least twice per year.
This measurement is the resistance value for the
entire site.
Selective measurement
Lastly, we measure the individual grounds with
the Selective test. This will verify the integrity of
the individual grounds, their connections, and
determine whether the grounding potential is
fairly uniform throughout. If any of the measure-
ments show a greater degree of variability than
the other ones, the reason for this should be
determined. The resistances should be measured
on:
• Each leg of the tower and all four corners of
the building (cell sites/towers)
• Individual ground rods and their connections
(electrical substations)
• Both ends of the remote site (remote
switching)
• All four corners of the building (lightning
protection)
EI-162X
SENSING
CURRENT
TRANSFORM
ER
EI-162AC
I
ND
U
CING CUR
R
EN
T
TR
AN
S
FORMER
H/C2
OFF
3
POLE
4
POLE
4
POLE
2
POLE
S/P2
ES/P1
E/C1
START
TEST
DISPLAY
MENU
CHANGE
ITEM
SELECT
1625-2
ADVANCED EARTH / GROUND TESTER GEO
E S H
AC
Rresistance
300kΩ
Earth/Ground Resistance 300kΩ
DC
Resistance 3kΩ
RA
R
—
R~
2
POLE
3
POLE
3
POLE
4
POLE
H/C2
OFF
3
POLE
4
POLE
4
POLE
2
POLE
S/P2
ES/P1
E/C1
START
TEST
DISPLAY
MENU
CHANGE
ITEM
SELECT
1625-2
ADVANCED EARTH / GROUND TESTER GEO
E S HES
AC
Rresistance
300kΩEarth/Ground Resistance 300kΩ
DC
Resistance 3kΩ
RA
R
—
R
~
2
POLE
3
POLE
3
POLE
4
POLE
EI-162X
SENSING
CURRENT
TRANSFORM
ER
15
A typical setup
at an electrical
substation.
Using Stakeless
testing at a remote
switching site.
Using Selective
testing on a light-
ning protection
system.