Prospective Fault Current - KYORITSU 4118A Manual De Instrucciones

For instance in a TN system with nominal mains voltage Uo = 230 V
protected by gG fuses the Ia and max Zs values could be:
Rating
Using the current ranges on models 4118A can be also tested the

Prospective Fault current.

Prospective Fault current measured by instruments must be higher than
Ia of the protective device concerned
Practical example of verification of the protection in a TN system according to
the international Standard IEC 60364.
Disconnecting time 5s
(A)
Ia (A)
6 28
10 46
16 65
20 85
25 110
32 150
40 190
50 250
63 320
80 425
100 580
Disconnecting time 0.4s
Zs ( Ω ) Ia (A)
8.2 47
5 82
3.6 110
2.7 147
2.1 183
1.53 275
1.21 320
0.92 470
0.71 550
0.54 840
0.39 1020
Fig.9
— 17 —
Zs ( Ω )
4.9
2.8
2.1
1.56
1.25
0.83
0.72
0.49
0.42
0.27
0.22