METREL EurotestXC MI 3152 - RCD Uc - Contact Voltage

MI 3152(H) EurotestXC (2,5 kV) Tests and measurements
105
1)
Parameter is available only when parameter Use is set to other (for Electrical Vehicle
(EV) RCDs and Mobile installations (MI) RCDs).
2)
With Plug test cable or Plug commander RCD tests are measured in the same way
regardless of the setting. The parameter is meant for documentation.
3)
Parameter is available only when RCD I test is selected and parameter Use is set to
other.
Connection diagram
Figure 7.27: Connecting the Plug commander and the 3-wire test lead
7.7.1 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 7.27.
 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, EV, MI (a.c. part)
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