Testboy TV 470, Operating Instructions Manual

Page: 65 / 160

Information to DIN VDE 0701-0702:2008-06
Testboy
®
TV 470 65
ENGLISH
Insulation resistance
The insulation resistance should be measured as follows:
Protection class 1
between L+N against PE
Protection class 2 between L+N and against exposed conductive com-
ponents of the device
Protection class 3 between the voltage connection and exposed con-
ductive components of the device.
In order to ensure that all insulation exposed to the mains is checked
with this measurement, make sure that all switches, temperature
regulator etc. are activated. The measurement voltage is 500 VDC.
Limits
Protection class DIN VDE 0701 DIN VDE 0702
class-I
> 0.3 M Ω Devices with heating elements
> 1 M Ω Devices without heating elements
> 2 M Ω Exposed conductive components without
PE connection
class-II
> 2 M Ω
PC III
> 250 k Ω
Important notes
|
The equivalent leakage current test should be done even when the ISO
test is successful.
|
Exposed conductive components that are connected to the PE conductor
should be tested with the test leads.
|
Good measurement values can be shown as erroneous ISO measure-
ments.
|
If all safety relevant parts are not reach when doing ISO measurements,
a PE conductor current measurement or a touch current measurement
should be made instead of the ISO/EV test. Either the direct method or
the indirect method

I can be used. With the indirect method, the DUT
has to be in an isolated position.