32 GMC-I Messtechnik GmbH
Protection Category I Devices
with Outputs for Safety Extra-Low
Voltage
and Exposed Conductive Parts
– Measurement type LN(TS) - P1
– DUT mains plug to test socket
– Test probe P1 to P1 terminals
Schematic Diagram
Insulation resistance is measured successively between short-cir-
cuited mains terminals (L-N) and the safety extra-low voltage out-
puts which can be contacted with test probe P1, as well as exter-
nal conductive parts which are not connected to the housing.
If measuring points should be contacted one after the other, this
is indicated by a dashed line. However, there are two parallel
measuring circuits for the RISO measurement with the LN(TS) –
P1//PE(TS) measuring parameter, which are established simulta-
neously to the short-circuited L and N conductors: one insulation
resistance is measured via PE at the test socket and, at the same
time, a second insulation resistance is measured via test probe
P1.
Wiring Diagram
2-Pole Measurement at Protection Category I Housing Parts
(only with SECUTEST PRO or feature H01)
– Measurement type P1 - P2
Schematic Diagram
Insulation resistance is measured between external conductive
parts which can be contacted from the outside with test probe P2
and are not connected to the housing, and the housing with test
probe P1.
Wiring Diagram
Special Case: Permanently Installed Protection Category I Devices
– Measurement type PE(mains) - P1
– Test probe P1 to P1 terminals
Schematic Diagram
Insulation resistance is measured successively between PE at the
mains connection and the extra-low voltage inputs by contacting
each of them with test probe P1.
Wiring Diagram
Deactivate the electrical system which supplies power to
the device under test before connecting the test instru-
ment!
➭ Remove the mains fuses from the device under test and dis-
connect neutral conductor N inside the device under test.
➭ Connect test probe P1 to phase conductor L at the device
under test in order to measure insulation resistance.
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