40
15.2
RPE
– Protective conductor resistance
VDE 0701-0702
VDE 0751-1 /
EN 62353
VDE 0544-4 /
EN 60974-4
Class
Class
Class
Class
Class
Class
Class
I
II
III
I
II
I
II
X
-
-
X
-
X
-
Explanation
Test samples with protective conductor must have a proper and
safe connection to all parts
-
that are connected to the protective conductor,
-
that are accessible and conductive,
-
that can be live in the event of a fault.
The protective conductor resistance consists of
-
the resistance value between the connection point of the
test sample up to all accessible conductive parts of the
device that are connected to the protective conductor,
-
the transition resistances of all terminal and plug
connections,
-
and, if necessary, the resistances of all connected
extension and device connecting cables.
Various testing currents can be selected to determine the
protective conductor resistance. The following RPE testing
currents are available:
Testing current
Type of current
0
0.6 A
AC
10.0 A
AC
Test frequency
50 Hz
The testing current must be selected by the responsible qualified
electrician.
The test sample must be disconnected from the mains.
The cables of the test sample must always be unreeled
(e. g. in case of a cable reel)!
Make sure that all terminal and plug connections (e. g.
the connection of the alligator clip or test probe) are in
perfect contact with the accessible and conductive
parts.
For devices with long connecting cables and a
protective conductor resistance > 1
Ω, the operator of
the test sample must be informed that the loop
impedance of the circuit can become too high and that
the test sample should be used with a residual current
protection device (RCD).
Application
Class I, RPE
Portable test sample
Connection diagram
Circuit diagram
Insert the shock-proof plug of the portable test sample into the
test socket of the appliance tester according to the connection
diagram.
Use the test probe to measure on all accessible conductive parts
of the test sample that are connected to the protective conductor.
