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MI 3108 EurotestPV Measurements a.c. LV installations
42
5.3 Resistance of earth connection and equipotential
bonding
The resistance measurement is performed in order to ensure that the protective
measures against electric shock through earth connections and bondings are effective.
Two sub-functions are available:
R LOWΩ - Earth bond measurement according to EN 61557-4 (200 mA),
CONTINUITY - Continuous resistance measurement performed with 7 mA.
See chapter 4.2 Function selection for instructions on
key functionality.
Figure 5.8: 200 mA RLOW Ω
Test parameters for resistance measurement
TEST
Resistance measurement sub-function [R LOWΩ, CONTINUITY]
Limit
Maximum resistance [OFF, 0.1 ÷ 20.0 ]
Additional test parameter for In Continuity sub-function
Buzzer On (sound if resistance is lower than the set limit value) or Off
5.3.1 R LOWΩ, 200 mA resistance measurement
The resistance measurement is performed with automatic polarity reversal of the test
voltage.
Test circuit for R LOWΩ measurement
Figure 5.9: Connection of 3-wire test lead plus optional extension lead
42


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