HT instruments SIRIUS87 - Manual (Page 37)

SIRIUS 87
EN - 35
4. Connect the shuko plug into a 230V 50Hz socket or the crocodiles to the conductors of
the three-phase system (see see Fig. 9, Fig. 10).
5. Press
the START/STOP key. The instrument starts the test.
 At the end of the test the instrument
emits a double sound signal
indicating that the test is correctly
terminated and displays the values
alongside.
LOOP

1.07

P-N

223
V 
214
A
CAUTION
The measurement of Phase-Neutral impedance entails the following of a
current of about 6A between the above said conductors. This may cause the
tripping of magnetothermal RCDs with nominal value lower than 10A. If
necessary effect the test upstream the RCD itself.
Calculation formula of prospective short circuit current:
PN
N
CC
Z
U
I

where U
N
= phase to neutral voltage 127V if V
meas
 150V
230V if 150V < V
meas
 265V
SAVING:
The tests can be stored pressing the
SAVE key twice
(according to § 5.1).
Value of phase to
neutral line
impedance
expressed in
.
Phase to neutral
effective voltage
value expressed
in Volt.
Effective value of the phase to neutral prospective
short circuit current expressed in Ampere
calculated according to the following formula.
SAVE
START
STOP