HT instruments EQUITEST5071 - Manual (Page 28)

EQUITEST 5071
EN - 26
At the end of the test,
the instrument gives out
a double sound to
indicate that test has
been correctly
performed and the
following screen
appears on the display.
LOOP 30.11.12
Value of Phase-Earth
impedance expressed in
.
1.07

215A
Freq=50.0HZ
VP-N=231V Vp-PE=231V
P-PE

Value of the assumed Phase-
Phase short-circuit current
calculated using the formula
reported below
FUNC Z2

Operating mode
N.B.: In TT systems, the value of impedance measured by the instrument may only be
attributed to the value of overall earth resistance. Therefore, in compliance with
standard CEI 64-8, the measured value may be taken as the value of the system’s
earth resistance.
Formula used for calculating the assumed short-circuit current:
PE
N
CC
Z
U
I

where: U
N
= Phase-Earth voltage 127 if
100< V
mis
 150
230 if 150V< V
mis
260
Z
PE
= measured Phase-Earth impedance
6. The results can be saved by pressing the SAVE key twice (see § 7.1).