FULLTEST3
EN - 50
6.6. LOOP IMPEDANCE TEST (LOOP)
In accordance with the regulation of IEC/EN60204-1 guideline, the protection
conditions against electric shocks in systems with automatic disconnection of the
mains voltage are:
¾ Measurement or evaluation of fault loop impedance and testing the over-current
protection device involved in the fault loop
¾ Limit values are shown in the Table 10 of IEC/EN60204-1 guideline
1. Press the FUNC key and select the LOOP function. The following screen is
shown on the display
Fig. 45 : LOOP initial screen
2. Select the test parameters on the instrument (see Table 8) and carry out the
desired setup
Parameter Description Value
MODE
Standard measurement mode LOOPL/N, LOOPL/L, LOOPL/PE
Measurement mode with IMP57
IMP57L/N, IMP57L/L,
IMP57L/PE
LIMIT
Measurement type for limit value
calculation (see §)
STD, kA, I
2
t, TRIP CURR., Ut
PROT
Protection type
MCB protection: B, C, D, K
Fuse protection: gG, aM
Nominal current protection
(see §)
Ib = max breaking capacity 1,1.5,3,4.5,6,10,15,16,20,25kA
Tset = max trip out time 0.1s, 0.2s, 0.4s, 5s
WIRE
Conductor type Cu (Copper), Al (Aluminum)
Conductor insulation PVC, Butyl rubber, EPR/XLPE
Conductor section
1, 1.5, 2.5, 4, 6, 10, 16, 25, 35,
50, 70, 95, 120, 150, 185, 240,
300, 400, 500, 630 mm
2
Number of conductor in parallel 1 ÷ 99
Table 8 : Setup parameters of LOOP function
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