Operation Manual

22 GMC-I Messtechnik GmbH
10.2 Equivalent Leakage Current
General
The equivalent leakage current measurement is a method for measuring
protective conductor current (DIN VDE 0701-0702) and/or device leakage
current (IEC 62353 (VDE 0751)).
A high-impedance power supply is connected between the short-cir-
cuited mains terminals and all exposed metal parts of the housing (which
are connected to one another).
Measurement of Equivalent Leakage Current I
EL
per DIN VDE 0701-0702
Measurement of Equivalent Device Leakage Current I
EDL
(per IEC 62353
(VDE 0751-1))
The patient ports are linked with
each other and are connected to
the same point on the housing.
Equivalent Patient Leakage Current I
EPL
(IEC 62353 (VDE 0751-1))
Test Setup
A high-impedance power supply
is connected between each pa-
tient port and all exposed metal
parts of the housing (which are
connected to one another). The
mains terminals are short-cir-
cuited, and connected to the
same point on the housing.
Measurement
The current which flows over the
insulation at the device under test is measured separately for each appli-
cation part.
Measurement is always performed with an AC power supply with current
limiting. Varying line voltages are taken into account.
Maximum Allowable Limit Values for Equivalent Leakage Current in mA
I
EL
Equivalent leakage current
I
EDL
Equivalent device leakage current
I
EPL
Equivalent patient leakage current
PE Protective conductor
1)
for devices with heating power of  3.5 kW
2)
with and without line voltage applied to the application part
~
DUT
Probe
mA
PE
L
N
Probe
PAT
DUT
~
mA
L
N
PE
Test Standard I
EL
I
EDL
I
EPL
VDE 0701-
0702:2008
SC I: 3.5
1 mA/kW
1)
SC II: 0.5
IEC 62353
(VDE 0751-1)
SC II 0.2 Type BF 5
2)
SC I (parts within or connected to PE) 1 Type CF 0.05
2)
Permanently connected devices with PE 10
Portable x-ray devices with additional PE 5
Portable x-ray devices without additional PE 2
Devices with mineral insulation 5
mA
Probe
PAT
DUT
L
N
~
PE