26 GMC-I Messtechnik GmbH
Special Case: Testing Protective Conductor Resistance at PRCDs
(as of firmware V1.4.0)
For PRCDs whose protective conductor resistance cannot be
measured when switched off, the SECUTEST BASE(10) offers the
“active: PE(TS) - P1” measurement type, with which the PRCD
can be switched on in order to ascertain protective conductor
resistance.
➭ Set the measurement type parameter to “active: PE(TS)
–
P1”.
➭ Connect the EL1 adapter (or alternatively a normal test probe)
to the P1 sockets at the test instrument.
➭ Connect the plug of the PRCD under test to the test socket.
➭ Connect the EL1 adapter to the outlet on the PRCD (alterna-
tive: connect the test probe to the protective conductor of the
PRCD’s outlet, e.g. by means of an alligator clip).
➭ Start the measurement.
➭ Switch line voltage to the test socket. Then switch the PRCD
on.
➭ Otherwise, the test sequence is the same as described
above.
With the +200 mA=, –200 mA= and ±200 mA= mea-
surement types, test current rises very slowly in order to
prevent triggering of residual current monitoring at the
PRCD. And thus with this measurement type, it may take
longer than usual until a valid measured value is dis-
played. For this reason, the protective conductor should
not be contacted manually with the test probe, in order to
prevent a sudden rise in test current resulting in inadver-
tent tripping of the PRCD.
Maximum Allowable Limit Values for Protective Conductor
Resistance for Connector Cables with Cross-Sections of up to
1.5 sq. mm and Lengths of up to 5 m
1
Total protective conductor resistance: max. 1 Ω
Test Standard
Test
Current
Open-
Circuit
Voltage
R
SL
Housing –
Device Plug
R
SL
Housing –
Mains Plug
Mains
Power
Cable
VDE 0701-
0702:2008
IEC 62353:2007
(VDE 0751-1)
>
200 mA
or
10 A~
4 V < U
L
<
24 V
0.3 Ω
+ 0.1 Ω
1
for each
additional
7.5 m
DIN EN 60974-4
VDE 0544-
4:2009-06
0.2 Ω
IEC 62353
(VDE 0751-1)
>
200 mA
0.2 Ω 0.3 Ω 0.1 Ω
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