FULLTEST
3
EN - 33
5.6. LOOP IMPEDANCE / SHORT-CIRCUIT CURRENT (LOOP)
• According to EN 60204-1, the conditions for protection against electric shock in installations with
automatic disconnection of mains voltage are:
• Measurement or evaluation of fault loop impedance and testing the over-current protection device
involved in the fault loop.
• Limit values are shown in the Table 10 of EN 60204-1.
5.6.1. LOOP DISPLAY EXPLANATION
Adjustable/selectable parameters:
MODE - measurement mode
LOOP
L/N
, LOOP
L/L
, LOOP
L/PE
, IMP57
L/N
, IMP57
L/L
or IMP57
L/PE
LIMIT - limit value mode
STD, kA, I
2
t, TRIP CURR. or Ut, see the explanation below
Ib – breaking capacity of protection 1, 1.5, 3, 4.5, 6, 10, 15, 16, 20 or 25 kA
PROTECTION - type of protection MCB B, MCB C, MCB D, MCB K, FUSE gG or FUSE aM
In - nominal current of protection
See the values in chapter “LIMIT VALUE EXPLANATION” below
Tset
-
max allowed tripping time
0.1 s, 0.2 s, 0.4 s or 5 s
WIRE - wire material
Cu (Copper) or Al (Aluminium)
COATING - wire coating
PVC, BUTYL RUBBER or EPR/XLPE
SECTION - wire section
1, 1.5, 2.5, 4, 6, 10, 16, 25, 35, 50,
70, 95, 120, 150, 185, 240,
300, 400, 500 or 630
mm
2
N - number of conductors
1
99
Figure 23: Display with LOOP
L/N
test result
1 ..... Selected function.
2 ..... Selected nominal voltage (230 or 240 V) needed for calculation of short-circuit current.
3 ..... READY message. It is displayed when present mains voltage U
L/L
, U
L/N
or
U
L/PE
within required
range is present.
4 ..... Sub-results - mains voltage U
L/PE
or
U
L/PE
or
U
L/L
at which the measurement has been done and
calculated prospective short-circuit current I
SC
.
5 ..... Measurement screen touch-screen key.
6 .....
MODE
touch-screen key to select measurement mode (LOOP L/N, LOOP L/L, LOOP L/PE, IMP57
L/N, IMP57 L/L or IMP57 L/PE). Currently selected mode is displayed on the bottom of the key.
7 .....
LIMIT
touch-screen key to select limit mode (STD, kA, I
2
t, TRIP CURR. or Ut). Currently selected
mode is displayed on the bottom of the key.
