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MI 3108 EurotestPV Measurements a.c. LV installations
47
5.4.1 Contact voltage (RCD Uc)
A current flowing into the PE terminal causes a voltage drop on earth resistance, i.e.
voltage difference between PE equipotential bonding circuit and earth. This voltage
difference is called contact voltage and is present on all accessible conductive parts
connected to the PE. It shall always be lower than the conventional safety limit voltage.
The contact voltage is measured with a test current lower than ½ IN to avoid trip-out of
the RCD and then normalized to the rated IN.
Contact voltage measurement procedure
Select the RCD function using the function selector keys.
Set sub-function Uc.
Set test parameters (if necessary).
Connect test cable to the instrument.
Connect test leads to the item to be tested (see figure 5.17).
Press the TEST key to perform the measurement.
Store the result by pressing the MEM key (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 5.1 for detailed
contact voltage calculation factors.
RCD type
Contact voltage Uc proportional to
Rated IN
AC
1.05IN
any
AC
S
21.05IN
A, F
1.41.05IN
30 mA
A, F
S
21.41.05IN
A, F
21.05IN
< 30 mA
A, F
S
221.05IN
B, B+
21.05IN
any
B, B+
S
221.05IN
Table 5.1: Relationship between Uc and I
N
Loop resistance is indicative and calculated from Uc result (without additional
proportional factors) according to:
N
C
LI
U
R
.
Figure 5.18: Example of contact voltage measurement results
47


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