Benning ST 755+ - Page 16

2.4 Intended use
Safety
5284 / 08/2023 enBENNING ST 755+ / ST 760+16
• The device is not intended for measurements in electrical installations! The test sample
must be free of external voltage (disconnected from the mains).
• For the testing of test samples with the warning “High leakage current!”, the test must be
carried out by qualified electricians only!
• For device protection and for functional testing, the test voltages are monitored. In case of a
fault, an error will be indicated on the display. Measurement will be interrupted. In case of a
fault current of ≥25mA, the device will be switched off within a period of 100ms to 200ms.
• In order to detect short-circuits and body contacts occurring behind the switch-on elements
(e.g. switch, thermostat, relay) of the test sample, the test sample must be switched on.
• Tap the “Pause” button to interrupt the measurement. During the pause, the test socket
remains live!
WARNING
Dangerous voltage
Danger to life or serious injury is possible due to contact with high electric voltage in case of
incorrect operation.
• Do not touch the bare measuring probe tips of the safety measuring lines or the bare
contacts of the optional alligator clips, Only touch the safety measuring lines in the area
intended for your hands.
• Please note that dangerous testing voltages might be present at the device during insulating
resistance measurement. These might also be applied to the measuring circuit if safety
measuring lines are contacted.
• Connect the safety measuring lines to the correspondingly marked measuring jacks of the
device and check them for tight fit.
• Only use approved safety measuring lines.
• Attach the protective caps to the contact tips of the safety measuring lines (circuits of
overvoltage category CATIII orIV).
• When disconnecting the measuring circuit, first remove the live safety measuring line
(phase) and then the neutral safety measuring line from the measuring point.
Securing the device
If the device is not in a technically perfect and operationally safe condition, safe operation is no
longer guaranteed. Make sure that the following measures are taken:
• Switch off the device.
• Remove the device from the measuring point.
• Secure the device against unintentional operation.
The following characteristics indicate that safe operation is no longer guaranteed:
• The device (housing, connecting cables, plugs or safety measuring lines) shows visible
damage or is damp/wet.
• The insulation of the safety measuring lines is damaged.
• The device does not work properly in compliance with regulations (e.g. errors during
measurements).
• The device shows recognisable consequences of prolonged storage under inadmissible
conditions.
• The device shows recognisable consequences of extraordinary stress due to transport.