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5.8.3 Performing a measurement
In this function, connection to the neutral is only obligatory for "Z
S
"measurement. For “Z
S
”, the
“neutral” test lead can be connected to the earth and for “Z
i
”, it can be connected to a phase (phase-
phase loop measurement).
1. Connect the instrument according to the diagrams below.
TT System :
L-PE loop measurement enables quick earth measurement without planting an earth
testing rod (excess value).
L-N loop measurement enables the short-circuit current to be calculated and makes
it possible to scale protective devices (fuses or circuit-breaker)
TN System : L-PE or L-N or L-L loop measurement enables measurement of fault loops and
calculation of short-circuit currents for scaling of fuses or circuit-breaker.
IT System :
Measuring L-N or L-L loops enables fault loop measurement and calculation of short-
circuit currents for scaling of fuses or circuit-breakers. The L-PE loop cannot be
measured on account of the high impedance of the supply transformer’s earth
connection (> measurement range) , even total insulation from the earth.
L1
L2
L3
N
PE
> 20 m
S
TN System
L1
L2
L3
N
PE
R
A
> 20 m
S
TT System
L1
L2
L3
N
Z
PE
> 20 m
S
R
A
IT System
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