MZC-304
– USER MANUAL
13
2.7.5 Measurement of short circuit loop impedance in L-PE circuit protected
by a residual current device (RCD)
The MZC-304 enables the fault loop impedance measurements without altering the mains pro-
tected by RCD's with the rated current of at least 30mA.
Turn on the meter.
Turn the rotary switch
to the
Z
L-PE
RCD
posi-
tion
Depending on needs, select the measurement parameters according
to section 2.7.1.
Connect the test leads according to one of the drawings.
Remaining issues connected with the measurements are the same as those described for meas-
urements of the L-PE circuit.
Note:
- Maximum measurement time is about 32 seconds. The measurement can be interrupted by press-
ing the
ESC
button.
- In the electrical installations with 30 mA RCD's the sum of leakage currents of the installation and
the test current may trip the RCD. If this happens, try to reduce the leakage current in the tested
mains (for example by disconnecting loads).
