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MI 3105 EurotestXA: Appendix H
DK modifications
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.
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