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Metrel MI 3102 BT - Eurotest XE Manual

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MI3002 MI3100 MI3102 IT supply systems
92
B.3.2 Line impedance
See chapter 5.6 Line impedance and prospective short-circuit current, the measurement
is the same; only terminal voltage monitor indication corresponds to IT system.
B.3.3 RCD testing
RCD testing is performed in the same way as in TN/TT system (See chapter 5.4 Testing
RCDs), with the following exception:
Contact voltage measurement is not relevant.
Test circuit with bypassing principle should correspond to that in figure B.3.
L1
L2
L3
PE
R
E
Zi
L1
PE
L2
L/L1
N/L2
PE/L3
RCD
R
E2
RCD
Figure B.3: RCD testing in IT system
B.3.4 First fault leakage current (ISFL) (MI 3102 only)
First fault leakage current measurement is performed in order to verify the maximum
current that could leak into PE from observed line. This current flows through the
insulation resistance and reactance (capacitance) between the other lines and PE.
… 92 …


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