Benning ST 755+ - Testing the Protective Conductor Current; Figure 16 Testing the Protective Conductor Current (Connection Diagram, Circuit Diagram)

Testing
9.5 Individual tests
5284 / 08/2023 en BENNING ST 755+ / ST 760+ 83
9.5.3 Testing the protective conductor current
The protective conductor current test [}page44] is intended to check test samples of protection
classI for proper insulation capacity at mains voltage. This is to ensure that no leakage or fault
current flows from the active parts to earth and that there is no risk of a dangerous electric flow
via accessible conductive components.
Requirements
• Approved safety measuring lines
• Please observe the requirements for measuring [}page71].
• The test sample is disconnected from the mains.
• Make sure that you are familiar with the procedure for manual [}page77] and automatic
[}page76] testing.
• Make sure that you know the necessary measuring points.
• The test sample is connected according to the connection diagram.
• Please observe the operating manual and the technical data of the test sample.
1 2
3
Figure16: Testing the protective conductor current (connection diagram, circuit diagram)
1 Direct current measuring method (ClassI, I
PE
)
The shock-proof plug of the test sample is plugged into the test socket of the device.
2 Differential current measuring method (ClassI, I
PE
)
The shock-proof plug of the test sample is plugged into the test socket of the device.
3 Alternative leakage current measuring method (ClassI, I
PE
)
The shock-proof plug of the test sample is plugged into the test socket of the device.
Procedure
1. Start the test.
2. If you are using the direct or differential current measuring method, change the polarity of
the mains voltage at the test socket [}page31].
Test the test sample in all switch positions (test sample functions), if available.