MARTINDALE ET4500 - 5.6 Line impedance and prospective short-circuit current; Voltage drop; Line Impedance Test Parameters

Martindale ET4000 / ET4500 Measurements
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5.6 Line impedance and prospective short-circuit current /
Voltage drop
Line impedance is a loop comprising of the mains voltage source and line wiring. The
measurements conform to BS EN 61557-3.
The voltage drop sub-function is intended to check that a voltage in the installation stays
above acceptable levels if the highest current is flowing in the circuit. The highest
current is defined as the nominal current of the circuit's fuse.
Sub-functions:
 Z LINE - Line impedance
 ΔU – Voltage drop measurement
See chapter 4.3 Function selection
for instructions on key functionality.
Figure 5.28: Line impedance
Figure 5.29: Voltage drop
Test parameters for line impedance measurement
Test
Selection of line impedance [Zline] or voltage drop [ΔU] sub-function
FUSE type
Selection of fuse type [---, BS88-2, BS3036, BS88-3, BS1362, B, C, D]
FUSE I
Rated current of selected fuse
FUSE T
Maximum breaking time of selected fuse
Lim
Upper limit line impedance value for selected fuse
See Appendix A for reference fuse data.
Additional test parameters for voltage drop measurement
ΔU
MAX
Maximum voltage drop [3.0 % - 9.0 %].
Additional key:
HELP /
CAL
Click
Measures Zref value for U function.
Keep pressed for 1s
Enters Help screen.