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9-2 Simplified measurement
Use this method when the auxiliary earth spike cannot be stuck. In this
method, an existing earth electrode with a low earth resistance, such as a
metal water pipe, a common earth of a commercial power supply and an
earth terminal of a building, can be used with two-pole method (E and P).
(1) Connect the test leads as Fig. 9-2 shows.
MODEL7196B to LINE (C) terminal, and MODEL7244A to EARTH (E)
terminal
Fig. 9-2
(2) Wiring
Make connection as shown in the following figure.
Connection using common earth
Connection using socket outlet
of commercial power supply
Fig. 9-3
Fig. 9-4
Red
Black
E Black
C Red
Power
Load
re
Rx
P
N
E
E Black
C Red
