HT EQUITEST 5071 User Manual page 25

The following test entails the circulation of a maximum current of approx. 6A
between phase and neutral. This could cause the tripping of possible
magnetothermal protections with lower tripping currents. In this case, carry
out the measurement upstreams of the protections.
When message "MEASURING..." is displayed, this indicates that the
instrument is carrying out the test. Never disconnect the instrument's leads
during this phase.
At the end of the test,
the instrument gives out
a double sound to
indicate that test has
been
performed and
following
appears on the display.
Formula used for calculating the assumed short-circuit current:
where U
6. The results can be saved by pressing the SAVE key twice (see § 7.1).
LOOP
correctly
the
screen
FRQ=50.0HZ
VP-N=231V
P-N
FUNC
I
= Phase-Neutral voltage
N
Z = measured Phase-Neutral impedance
PN
CAUTION
CAUTION
30.11.12
1.07

215A
VP-PE=231V
Z2
U

N
CC
Z
PN
127 if V
230 if 150V< V
EN - 23
EQUITEST 5071
Value of Phase-Neutral Line
impedance expressed
Ohm
Value of the assumed Phase-
Neutral short-circuit current
calculated using the formula
reported below
 150
mis
 260
mis
in