MPI-506 – USER MANUAL
3.4.5 Fault loop impedance in L-PE circuit protected with a residual cur-
rent device (RCD)
The meter allows the fault loop impedance measurements without making changes in the mains
with the residual current devices with rated current of minimum 30 mA.
Switch on the meter.
Set the rotary switch to the Z
L-PE
RCD position.
Select the leads length as described in
sec. 3.4.1 according to the needs.
Connect the test leads as shown in one of the figures.
Measurement in a TN-S system
Measurement in a TT system
Measurement in a TN-C-S system
The remaining measurement issues are analogous to the ones described for the measurements
in the L-N or L-L systems.
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