MI 3325 MultiServicerXD
120
Figure 6.82: Examples of Z auto measurement results
6.2.22 Voltage Drop
Note!
MI 3325 checks voltage on Zline-PE terminal before running test and warning
message is presented in case the hazardous live voltage is detected. It is
recommended to remove supply from tested circuit, find, and eliminate problem
before any other activity! See chapter
1.2 Testing potential on TP1-PE terminal for
The voltage drop is calculated based on the difference of line impedance at connection points
(sockets) and the line impedance at the reference point (usually the impedance at the
switchboard).
Figure 6.83: Voltage drop menu
Test results / sub-results
∆
U
Voltage drop
Ipsc
Prospective short-circuit current
Uln
Voltage L-N
Zref
Reference line impedance
Z
Line impedance
Voltage drop
∆
U
[%] is calculated as follows:
100
)
(
%
N
N
REF
U
I
Z
Z
U
where:
