GMC-I Messtechnik GmbH
15
Test Standard
The following must be substantiated per DIN VDE 0100,
part 600: 2008:
–
Contact voltage occurring at nominal residual current may not
exceed the maximum allowable value for the system.
–
Tripping of the RCCB must occur within 400 ms (1000 ms for
selective RCDs) at nominal residual current.
Important Notes
• The
PROFI
TEST
M
ASTER
allows for simple measurements at all
types of RCDs. Select RCD, SRCD, PRCD etc.
• Measurement must be executed at one point only per RCD
(RCCB) within the connected electrical circuits. Low-resistance
continuity must be substantiated for the protective conductor
at all other connections within the electrical circuit (R
LO
or U
B
).
• The measuring instruments often display 0,1 V contact voltage
in TN systems due to low protective conductor resistance.
• Be aware of any biasing currents within the system. These may
cause tripping of RCDs during measurement of contact
voltage U
B
, or may result in erroneous displays for
measurements with rising current:
Display = I
F
- I
biasing
• Selective RCDs (RCD S) identified with an
can be used as
the sole means of protection for automatic shutdown if they
adhere to the same shutdown conditions as non-selective
RCDs (i.e. t
a
< 400 ms). This can be substantiated by measur-
ing shutdown time.
• Type B RCDs may not be connected in series with type A
RCDs.
Note
Premagnetization
The 2-pole adapter is only provided for AC measure-
ments. Suppression of RCD tripping by means of pre-
magnetization with DC current is only possible via a
country-specific plug insert, e.g. SCHUKO, or a 3-pole
adapter.
Measurement With or Without Probe
Measurements can be performed with or without a probe.
Measurements with probe require that both probe and reference
earth are of like potential. This means that the probe must be
positioned outside of the resistance area of the earth electrode
(R
E
) at the RCD.
The distance between the earth electrode and the probe should
be at least 20 meters.
The probe is connected with a 4 mm contact protected plug.
In most cases this measurement is performed without probe.
Attention!
!
The probe is part of the measuring circuit and may carry
a current of up to 3.5 mA in accordance with VDE 0413.
Testing for the absence of voltage at the probe can be performed
with the U
PROBE
function (see also section 6.1 on page 13).
7.1
Measuring Contact Voltage (with reference to nominal
residual current) with
1
/
3
Nominal Residual Current and
Tripping Test with Nominal Residual Current
Select the Measuring Function
Connection
Set parameters for I
N
S
I
N
Nom. residual current:
10...500 mA
Type 1:
RCD, SRCD, PRCD ...
Nominal current:
6 ... 125 A
Type 2:
AC
, A
, B
*
* Type B = AC/DC sensitive
Phase displacement: 0°/180°
X times tripping current:
Negative/positive half-wave
Negative/positive direct current
1, 2, 5
Waveform:
Connection:
Without/with probe
Type of system:
TN/TT, IT
Contact voltage:
time to trip:
< 25 V, < 50 V, < 65 V