Operation Manual

MI 3121H Smartec 2,5 kV Insulation / Continuity Continuity
26
5.2 Resistance of earth connection and equipotential bonding
The resistance measurement is performed in order to assure that the protective measures
against electric shock through earth bond connections are effective. Two sub-functions are
available:
 RLOW - Earth bond resistance measurement according to EN 61557-4 (200 mA),
 CONT - Continuous resistance measurement performed with 7 mA.
See chapter 4.1 Function selection for
instructions on key functionality.
Figure 5.11: 200 mA RLOW function example
Test parameters for resistance measurement
Test Resistance measurement sub-function [RLOW, CONT]
Limit
Maximum resistance [OFF, 0.1 Ω ÷ 20.0 Ω]
5.2.1 RLOW, 200 mA resistance measurement
The resistance measurement is performed with automatic polarity reversal of the test
voltage.
Test circuit for RLOW measurement
PCC1
PCC2
PCC3
MPEC
MPEC....Main Potential Equilizing Collector
PCC....Protection Conductor Collector
extension lead
Figure 5.12: Connection of 2-wire test lead plus optional extension lead