HT instruments SIRIUS87 - Manual (Page 40)

SIRIUS 87
EN - 38
5.
 Press the START/STOP key once. The instrument carries out the
test injecting a current in phase with positive half wave of the
voltage indicated on
display by 0°.
 Press the START/STOP key twice. The instrument carries out the
test injecting a current in phase with negative half wave of the
voltage indicated on
display by 180°.
 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

3.65

P-PE

221
V 
63
A
CAUTION
The measurement of Phase-PE 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 current value lower. If necessary
effect the test upstream the RCD itself.
Formula for calculation of prospective short circuit current:
PE
N
CC
Z
U
I

where U
N
= phase to earth voltage 127V if 100V < 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
earth fault
impedance
expressed in
.
Phase to earth
effective voltage
value expressed
in Volt.
Effective value of the phase to earth prospective
short circuit current expressed in Ampere
calculated according to the following formula.
SAVE
START
STOP