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MI 3100 s, MI 3100 SE EurotestEASI Measurements
40
Connections for testing RCD
Figure 5.17: Connecting the plug commander and the 3-wire test lead
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 IN 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 switch.
Set sub-function to Uc using UP / DOWN keys.
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 (MI 3100 SE only).
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 IN
AC 1.05I
N any
AC 21.05I
N
A, F 1.41.05I
N 30 mA
A, F 21.41.05I
N
A, F 21.05I
N < 30 mA
A, F 221.05I
N
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
.
40


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