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MI 3100 s, MI 3100 SE EurotestEASI Measurements
46
Fault loop impedance measurement procedure
Select the Zloop function using function selector switch.
Set sub-function to Zloop or Zs rcd using UP / DOWN keys.
Select test parameters (optional).
Connect test cable to the instrument.
Connect test leads to the item to be tested (see Figure 5.17 and Figure 5.24).
Press the TEST key to perform the measurement.
Store the result by pressing the MEM key (MI 3100 SE only).
Figure 5.25: Example of loop impedance measurement result
Displayed results:
Z ............... fault loop impedance
Isc ............ prospective fault current,
Lim ........... low limit prospective short-circuit current value
Prospective fault current ISC is calculated from measured impedance as follows:
Z
kUn
ISC
SC
where:
Un ......... Nominal UL-PE voltage (see table below),
ksc ........ Correction factor for Isc (see chapter 4.3.5 Isc factor).
Un Input voltage range (L-PE)
110 V (93 V UL-PE 134 V)
230 V (185 V UL-PE 266 V)
Notes:
High fluctuations of mains voltage can influence the measurement results (the noise sign
is displayed in the message field). In this case it is recommended to repeat few
measurements to check if the readings are stable.
This measurement will trip-out the RCD in RCD-protected electrical installation if test
Zloop is selected.
Select Zs rcd measurement to prevent trip-out of RCD in RCD protected installation.
46


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