MI 3155
Eurotest
XD
Test and measurements
118
Test procedure
Enter the
RCD Uc
function.
Set test parameters / limits.
Connect test cables to the instrument.
Connect L, N and PE of 3-wire test lead or Plug commander to the object under test,
Connect test lead to P/S terminal and external earthed point (optional, see
Start the measurement.
Save results (optional).
The contact voltage results Uc and Uc(P) relate to the rated nominal residual current of the
RCD and are 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
for
detailed contact voltage calculation factors.
RCD type
Contact voltages Uc and Uc(P)
proportional to
Rated I
N
AC, EV, MI (a.c. part)
G
1.05
I
N
any
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
B, B+
S
2
2
1.05
I
N
Table 7.2: Relationship between Uc, Uc(P) 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
.
Figure 7.35: Examples of Contact voltage measurement result
Test result / sub-results
Uc
Contact voltage
Uc(P)
– if selected
Contact voltage, external probe
Rl
Fault loop resistance
