52
15.6
ILeak
– Device leakage current
Explanation
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
-
-
The device leakage current corresponds to the sum of all leakage
currents and is tested at mains voltage for medical devices of
protection classes I and II to prove proper insulation capacity. This
is to ensure that no leakage current flows from the active parts, the
housing or accessible conductive parts to earth and that there is
no risk of a dangerous electric flow via accessible conductive
parts.
For this purpose, the following measuring methods may be used:
direct current measuring method
differential current measuring method
alternative leakage current measuring method
For the direct and differential current measuring method,
the test socket is supplied with mains voltage.
The alternative leakage current measuring method is
only admissible if the test is carried out at mains voltage
and an RPE measurement with a positive result has
been carried out before.
For direct and differential current measurement, the
device leakage current must be measured with both
polarities. L<->N, N<->L
The insulating resistance must be measured before
carrying out a direct current measurement for medical
devices of protection classes I and II.
If the measured value of the alternative leakage current
measurement exceeds 1 mA, the direct current
measurement must be carried out.
For the alternative leakage current measurement, L and
N conductors are shorted. The leakage current can be
twice the value for test samples with bipolar circuit
breakers.
For such test samples, the device leakage current may
be halved.
Check whether the measuring circuit is closed before
starting the test. Otherwise, no device leakage current is
measured and the test result will be incorrectly displayed
as being positive.
Application
Class I, ILeak, direct current measuring method
The polarity of L-N must be reversed.
Connection diagram
VDE 0751-1
Circuit diagram
VDE 0751-1
Place the test sample onto an insulated surface.
Insert the shock-proof plug of the test sample into the test socket
of the appliance tester.
The test sample is supplied with mains voltage and must be
tested in all switch positions (device functions).
Use the test probe to scan all accessible conductive parts and
applied parts.
Class I, ILeak, differential current measuring method
The polarity of L-N must be reversed.
Connection diagram
VDE 0751-1
Circuit diagram
VDE 0751-1
Insert the shock-proof plug of the test sample into the test socket
of the appliance tester.
The test sample is supplied with mains voltage and must be
tested in all switch positions (device functions).
Use the test probe to scan all accessible conductive parts and
applied parts.
