GMC-I Messtechnik GmbH
15
6.3
Measuring Protective Conductor Resistance
6.3.1
Equivalent Leakage Current
In accordance with DIN VDE 0701-0702:2008, protective conductor resistance must be
measured after the performance of the insulation resistance measurement. We recommend
equivalent leakage current measurement.
The limit value is:
•
3.5 mA for protection class I devices whose exposed conductive parts are connected to
the protective conductor.
•
1 mA per kW of heating power for protection class I devices with heating elements with a
total connected load of greater than 3.5 kW , whose exposed conductive parts are
connected to the protective conductor.
Attention
!
!
Do not touch the instrument’s terminal contacts during equivalent leakage current
measurement!
Ð
Connection is the same as for insulation resistance measurement.
Ð
Set the NETZ-VDE switch to “VDE”.
Ð
Set the measuring function selector switch to “I
EA
20 mA”.
Ð
Switch all DUT functions on and make sure, for example, that all thermostat contacts
and the like are closed.
Ð
Read the measured value in “mA” from the LCD panel.
In accordance with DIN VDE 0701-0702, the displayed current value between parts to
which voltage is applied during operation and exposed metal parts may not exceed
3.5 mA, or 1 mA per kW for devices with
>
3.5 kW heating power.
Note!
Leakage current measurement in accordance with the respective device regulations is
usually not possible, because the device would have to be set up in an electrically
isolated fashion, or connected to an earth isolated power supply to this end.
Equivalent leakage current is measured for this reason. Resultant measured values
are not directly comparable with the leakage current values set forth in the device
regulations.