MI 3101 EurotestAT: Appendix H
DK modifications
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H Appendix H – DK modifications
DK modifications relate to modified fault loop test group.
H.1 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 H.1: Fault loop
impedance
Test parameters for fault loop impedance measurement
TEST Selection
the
type of
fault loop
measurement
[Sikring, RCD*, Rs(RCD)*]
Sikring
or
RCD
selected:
Fuse type
Selection of
fuse
type
[---, NV, gG, B, C, K, D] **
Fuse I
Rated current
of selected fuse
Fuse T
Maximum
breaking time
of selected fuse
Isc_lim
Minimum short circuit
current
for selected fuse combination
Rs(RCD)
selected:
RCD
Rated residual current
sensitivity
of RCD [10 mA, 30 mA, 100 mA, 300
mA, 500 mA, 1000 mA]
Uc Touch
voltage
limit
[50 V, 25 V]
Rlim
Maximum fault loop
resistance
for selected RCD and Uc combination
See Appendix A for reference fuse data.
* Select RCD or Rs(RCD) to prevent trip-out of RCD in RCD protected installation.
** --- Means no fuse selected.
