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MI 3100 s, MI 3100 SE EurotestEASI Measurements
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5.5 Fault loop impedance and prospective fault current
Fault loop is a loop comprised by mains source, line wiring and PE path to the mains source.
The instrument measures the impedance of the loop and calculates the short circuit current.
The measurement is covered by requirements of the EN 61557-3 standard.
See chapter 4.2 Function selection for instructions
on key functionality.
Figure 5.23: Fault loop impedance
Test parameters for fault loop impedance measurement
Test Selection of fault loop impedance sub-function [Zloop, Zs rcd]
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
Lim Minimum short circuit current for selected fuse
See Appendix A for reference fuse data.
Circuits for measurement of fault loop impedance
Figure 5.24: Connection of plug commander and 3-wire test lead
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