Gossen MetraWatt 702 - Manual (Page 20)

20 GOSSEN METRAWATT GMBH
9.4 Equivalent Leakage Current
General
Measurement of equivalent leakage current is required for:
• DIN VDE 0701 and 0702,
after passing the insulation
test
Equivalent Device Leakage Current I
EDL
(DIN VDE 0751)
Measurement of equivalent device leakage current is required for:
• Electrical medial devices in accordance with DIN VDE 0751, part 1
Test Setup
A high-impedance power supply
is connected between the short-
circuited mains terminals and all
exposed metal parts of the
housing (which are connected to
one another).
Measurement
Current which flows over the
insulation at the device under test
is measured.
Maximum Allowable Limit Values for Equivalent Leakage Current in mA
I
EL
Equivalent leakage current
I
EHL
Equivalent housing leakage current
PE Protective conductor
1) For devices with heating power of greater than 3.5 kW
2) This limit value is not taken into consideration in the DIN VDE 0751 standard.
Connection
Refer to the schematic diagrams included with the online help for
connection instructions.
Connection Exception for Permanently Installed Safety Class I Devices
Current is measured between the probe, with which the L and N conduc-
tors must be contacted, and the protective conductor terminal PE at the
device under test for permanently installed safety class I devices under test.
Attention!
!
Disconnect mains power before connecting the test instrument!
➭ Remove the mains fuses from the device under test and disconnect
the neutral conductor N inside the device under test.
➭ Connect the probe to phase conductor L and neutral conductor N at
the device under test in order to measure equivalent leakage current.
Connection Exception for Multi-phase Devices
Equivalent leakage current measurement is not appropriate for multi-
phase devices.
~
DUT
Probe
mA
SL
L
N
Probe
DUT
~
mA
L
N
PE
Test Standard I
EL
I
EHL
VDE 0701-1:
2000
SC I: 3.5
1 mA/kW 1)
SC II: 0.5
VDE 0702:
2004 3.5
1 mA/kW 1)
VDE 0751:
2001
SC II 0.2 2)
SC I (PE or parts connected to PE) 1
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