MPI-520 OPERATING MANUAL version 3.4
3.4.3 Measurement of short circuit loop impedance in L-PE circuit protected
with residual current device (RCD)
Set the rotary switch of function se-
lection at Z
L-PE
RCD position.
Press F1 push-button if L
lead length needs to be se-
lected.
Select a lead length by
means of and push-
buttons and press ENTER
push-button.
Connect test leads according to one of the drawings.
Remarks:
- Maximum measurement time is about 32 seconds. The measurement can be interrupted by press-
ing ESC push-button.
- In the electrical installations in which 30 mA - rated residual current devices are used, it may happen
that the sum of leakage currents of the installation and the test current will trigger RCD. In such a sit-
uation, one should try to reduce leakage current of the network being tested (for example, by discon-
necting load points).
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