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8.6 CHECK THE ELECTRICAL SAFETY OF THE EXTERNAL POWER SUPPLY
Testing the electrical safety of the external power supply should be carried out as part of the annual
maintenance and during repair work.
General information
The TRENDvent ventilation system consists of an external SK II power supply and the ventilator,
which is operated at 24 V direct current. To meet the protection class II requirements, the ventilation
system has been designed with a BF application part of the DIN standards EN 60601-1-A2:1995
and EN 60601-1:2006.
Tests
The tests are carried out by a device safety tester (e.g., SECUTEST SIII), working in accordance
with the DIN EN 62353:2008 standard. The leakage currents should be determined by direct mea-
surement.
The ventilation system should be tested with a BF application part according to protection class II.
The accompanying protection class II power supply is tested in the system. Any faults in the power
supply are detected in the test of the entire system according to protection class II.
Device leakage current
The device leakage current is measured by the device safety tester (e.g., SECUTEST SIII) with a
probe at the housing at the O2 sensor connection.
The test is passed if the device leakage current limits comply with the standard DIN EN 62353-
2008, Table 2.
9 FINAL WORKS
All maintenance or repair work must be recorded.
Furthermore, the “Service” checklist should be filled in and a testing seal, including the date and the
tester’s mark, should be applied at a suitable place on the device.
