Benning ST 755+ - Testing Procedures; Test Requirements and Preparation

Testing
9.1 Requirements for tests and measurements
5284 / 08/2023 en BENNING ST 755+ / ST 760+ 71
9 Testing
9.1
Requirements for tests and measurements
Please observe the following basic requirements for tests and measurements:
• During initial commissioning before carrying out the first test: Calibrate the device using the
internal calibration (zero balance, cable and probe calibration) [}page69].
• Only use approved safety measuring lines [}page74].
• Disconnect any safety measuring lines not required for the respective test or measurement
from the device.
• Please consider sources of interference that might be present. Strong sources of
interference in the vicinity of the device might involve unstable readings and measuring
errors.
• For carrying out the tests and measurements, please observe the associated measuring
ranges and measuring accuracies stated in the chapter “Measuring ranges”.
• Please observe the figures for the corresponding test setup.
• Please note that if the test is interrupted or paused, the testing voltage is still applied.
• Determine the necessary measuring points before starting the test.
• Follow the instructions on the display of the device.
• Make sure that you are familiar with the general operation of the device [}page27].
• A test sample may only be electrically tested if no serious defects have been detected
during the visual inspection.
• Please observe applicable regulations from the current VDE/ ENstandard.
• Please observe the manufacturer's specifications in the accompanying documents of the
test sample before starting a test as well as during the test.
• The cables of the test sample must be completely unreeled, e.g. in case of cable reels.
• For the testing of test samples with the warning “High leakage current!”, the test must be
carried out by qualified electricians only!
• Specification, selection and order of individual tests are determined by the responsible
qualified electrician.
• The limits preset in the factory correspond to the normative specifications that have been
applicable at the time of printing. Administration and definition of the customer-specific limits
shall be at the discretion of the qualified electrician carrying out the work.
• For test samples with protective measures regarding the protective conductor: Test the test
sample in all switch positions (test sample functions).
• Dangerous voltages might occur on the test sample during insulating resistance
measurement (R
Insu
) or when using the alternative leakage current measuring method.
• 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.
• Only carry out PRCDtests without load.
• 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.
• The jacks "L", "N" and "PE" are connected to the test socket. If mains voltage is applied to
the test socket, the connection will be disconnected.
• Tap the “Pause” button to interrupt the measurement. During the pause, the test socket
remains live!