MI 3101 EurotestAT: Appendix E
Reduced low voltage supply systems
116
RCD selected
Loop impedance
Measuring range according to EN61557 is 0.85
19999
.
Measuring range (
) Resolution
(
)
Accuracy
*
0.00
9.99
0.01
(10 % of r 15 digits)
10.0
99.9
0.1
15 % of reading
100
19999
1
20 % of reading
* Acccuracy may be impaired in case of heavy noise on mains voltage
Prospective fault current (calculated value)
Measuring range (A)
Resolution (A)
Accuracy
0.00
9.99
0.01
10.0
99.9
0.1
100
999
1
1.00k
9.99k
10
10.0k
23.0k
100
Consider accuracy of fault
loop impedance
measurement
IPSC calculation: .......................................IPSC = U
N
ksc / ZL-PE
U
N
= 55 V; (44 V
Uinp
61 V) for selected 55 V single-phase system
U
N
= 63 V; (56 V
Uinp
70 V) for selected 63 V three-phase system
Nominal input voltage ................................55 V / 63 V, 14 Hz
500 Hz
Test possibilities ........................................L1 - PE and L2 - PE
No trip out of RCD.
R, XL values are indicative.
