-1
5
-
2-wires method: This method is a simple method for measurement
that does not use
an
auxiliary earthing
probe.
Use
the earth electrode
with the minimal existing earth ground resistance value as auxiliary
earth electrode and connect two simple testing wires (in which
C
(H)
-
P
(S)
,
E
-
ES
interfaces are in short circuit). It can make use of metal pipes,
fire hydrants and other metal buried objects, common earthing of
commercial electric power system or lightning protection earth ground
electrode and others to replace auxiliary earthing rods
C
(H)
,
P
(S)
---
remove
oxide layer on the connection point of the selected metal auxiliary
earthing object when making measurement.
Wire connection is as
shown in
following figure, and refer to
4-wires measurement for other operations.
2-wires simple method for measurement of earth ground resistance,
its reading on tester is the total value of earth ground resistance value of
