Operation Manual

16 GMC-I Messtechnik GmbH
R
INS
Insulation Resistance
Applications
Insulation resistance must be measured for:
In order to assure that all insulation which is exposed to line
voltage is tested during this measurement, make sure that
switches, temperature regulators etc. are closed.
Definition
Insulation resistance is active resistance between the electrical
circuits of the device and its exposed conductive parts.
Measuring Method
Protection Class I (PC1)
Insulation resistance is measured between short-circuited mains
terminals and the protective conductor.
Protection Class II (PC2)
Insulation resistance is measured between short-circuited mains
terminals and external conductive parts which can be contacted
with the probe.
Connection of Permanently Installed Protection Class I Devices
Attention!
!
Deactivate the electrical system which supplies power to
the device under test before connecting the test system!
Ð Remove the mains fuses from the device under test and
disconnect neutral conductor N inside the device under test.
Ð Connect the probe to phase conductor L at the device under
test in order to measure insulation resistance.
Note
The PE contact of the test socket is connected with the pro-
tective conductor of the mains terminal.
PC1: protection class l Between L + N and PE
PC2: protection class ll Between L + N and user accessible conductive parts