MPI-520 – USER MANUAL
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 selected.
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 pressing
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 situa-
tion, one should try to reduce leakage current of the network being tested (for example, by disconnecting
load points).
- Remaining issues connected with the measurements as well as the messages displayed are the same
as those described for measurements L-PE circuit.
- The function works for residual current devices of nominal current ≥ 30 mA.
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