MI 3152(H)
Eurotest
XC (2,5 kV)
Tests and measurements
88
Figure 7.23: Connecting the Plug commander and the 3-wire test lead
7.6.1 RCD Uc
– Contact voltage
Test procedure
Enter the
RCD Uc
function.
Set test parameters / limits.
Connect test cable to the instrument.
Connect test leads or Plug commander to the object under
test, see
Figure 7.23
.
Start the measurement.
Save results (optional).
The contact voltage result relates to the rated nominal residual current of the RCD and is
multiplied by an appropriate factor (depending on RCD type and type of test current). The 1.05
factor is applied to avoid negative tolerance of result. See
Table 7.1
for detailed contact voltage
calculation factors.
RCD type
Contact voltage Uc
proportional to
Rated I
N
Notes
AC
G
1.05
I
N
any
All models
AC
S
2
1.05
I
N
A, F
G
1.4
1.05
I
N
30 mA
A, F
S
2
1.4
1.05
I
N
A, F
G
2
1.05
I
N
< 30 mA
A, F
S
2
2
1.05
I
N
B, B+
G
2
1.05
I
N
any
Model MI 3152 only
B, B+
S
2
2
1.05
I
N
Table 7.1: Relationship between Uc and I
N
Fault Loop resistance is indicative and calculated from Uc result (without additional proportional
factors) according to:
𝑅
𝐿
=
𝑈
𝐶
𝐼
∆𝑁
.
