Simplified earth resistance measurement method:
6. This method is recommended where an earth resistance higher
than 10 is measured or where it is not possible to drive
auxiliary earth spikes. An approximate value of earth resistance
can be obtained by the two wire system where is shown in Fig.
2.+
7. Rotary to function switch to “EARTH VOLTAGE” position and
press to test. Make certain that earth voltage is less than 10 V.
8. First rotary the function switch to “200 ” position and press to
test, read earth resistance. If the display shows “1”(MSD), switch
to “2000 ” position and read earth resistance.
9. The reading obtained (Rx) is an approximate earth resistance
value. There is no need for external shorting as P and C
terminals are shorted by using the test leads specified for the
Simplified measurement.
(Fig. 2)
Rx = Re – re
Rx = True Earth Resistance
Re = Indicated Value
re = Earth Resistance of Earth Electrode
Since measuring current is as low as 2 mA, the earth leakage breaker
(ELCB) does not trip even if the earth side of the commercial power
supply with an ELCB is used.
-21-
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