MI 3101 EurotestAT: Appendix G
ES1 – application of regulative UNE-202008
130
Displayed results:
Rpe..........Resistance of PE conductor between reference point and tested socket,
RPEcal ....PE resistance value of reference socket (given in Z-LOOP function).
Notes
:
Warning! Measurement is executed on live installation!
Pay attention on proper selected location for reference fault loop impedance
measurement!
Measurement can only be done with right polarity of connected test leads.
High fluctuations of mains voltage influence the measurement results. The noise
sign
is displayed in the message field in such case. Repeat the measurement.
G.3.3 Fault loop impedance and prospective fault current
Fault loop is a loop comprising mains source, line wiring and PE return path to the mains
source. The instrument has ability to measure impedance of mentioned loop and calculate
short circuit current and contact voltage regarding the selected circuit breaker type. The
measurement is covered by requirements of the EN 61557-3 standard.
See
4.2 Single test
for active keys.
Figure G.8: Fault loop
impedance
Test parameters for fault loop impedance measurement
Save as RPEcal
Use result as reference value for
R
PE
measurement
[ON, OFF]
Z_lim = 70.0
Maximum
fault loop impedance
by default from regulative.
Circuits for measurement of fault loop impedance
L1
L2
L3
N
PE
R
E
Ro
L
PE
N
L/L
1
N/L2
PE/L3
Figure G.9: Connection of plug cable and universal test cable
