HT instruments FULLTEST3 - Manual (Page 37)

FULLTEST 3
EN - 36
Where:
T ... Trip out time according to the characteristic and nominal current of used protection device
K ... See the table below
Material / Coating PVC Natural / Butyl rubber EPR/XLPE
Cu (Copper) K = 115 K = 135 K = 143
Al (Aluminium) K = 76 K = 87 K = 94
N ... Number of conductors
S ... Cross section of a conductor
For calculation of short-circuit current I
SC nominal voltage Un of mains installation is needed, so it must
be selected in prior to the measurements.
How to select the nominal voltage Un:
Press the MENU
 SETUP  NOMINAL VOL. touch-screen keys and select 230 V or 240 V. S ee the
chapter “ NOMINAL VOLTAGE menu”.
5.6.4. LOOP MEASUREMENT
Measured quantities and display ranges:
Loop impedance LOOP
L/L 0  200 
Loop impedance LOOP L/N 0  200 
Loop impedance LOOP L/PE 0  200 
Loop impedance LOOP L/L (IMP57) 0  2 
Loop impedance LOOP L/N (IMP57) 0  2 
Loop impedance LOOP L/PE (IMP57) 0  2 
Mains voltage U L/L 173 460 V
Mains voltage U L/N or U L/PE 100 265 V
Short circuit current I SC 0.05  46.00 kA
Input requirements:
Mains voltage U L/L (READY condition) 173  460 V AC
Mains voltage U L/N or U L/PE (READY condition) 100  265 V AC
1) Select LOOP measurement by pressing the FUNC hard key first.
2) Check selected measurement mode (LOOP L/N, LOOP L/L, LOOP L/PE, IMP57 L/N, IMP57 L/L or
IMP57 L/PE) and modify it if needed by pressing the MODE (5) touch-screen key first.
3) Check selected limit mode (STD, kA, I 2 t, TRIP CURR. or Ut) and modify it if needed after pressing
the LIMIT (6) touch-screen key.
4) Check other parameters (they depend on selected limit mode) like type of protection, nominal
current, wire material etc. and modify them if needed by pressing appropriate parameter touch-
screen key first.
5) Select measurement screen by pressing the (4) touch-screen key and check all settings again.
6) Connect the test leads according to one of the figures below.