Installation Instructions
Seite/Page 82 - Kaptitel/Chapter 6: Installation Instructions
9.2.16
6.11.1 Insulation test
Attention:
Once the electrical system installation is complete, a
ground insulation test must be performed as follows:
1. Switch off all on-board electrical devices.
2. Start the generator.
3. Measure the AC-voltage with a voltmeter (adjust to Volt/AC) between
a. generator housing and AC-Control box
b. generator housing and ground.
c. the measured voltage must not exceed 50mV (millivolts).
4. Once the safety systems have been installed, they must be checked. If a RCD (Leakage Current Relay) has been
installed, it also has to be tested, in order to ensure that it functions properly. The individual phrases must be
checked against each other, and between phase and ground, (the single phase or 4th phase also needs to be
checked in this fashion).
5. If the generator is protected by a ground connection, then ALL electrical devices must also be connected to this
„common“ ground (usually ground contacts are attached to the devices' metallic housings).
The electrical system installation must also comply with the hook-up requirements of the shore current grid.
Generally a leakage current relay is sufficient for safe electrical operation; however, this must be confirmed by the
electrical safety standard in the region where the system is attached to a main land power grid. The relay has to
meet the required safety standard regulations.
Checking the electrical connections
There is always the possibility that circuits have been rerouted/changed or individual components have not been not
been correctly laid out on the circuit diagrams.
The installation electrician should therefore check and label all electrical connections to ensure that they correspond
to the main circuit diagram. The inspection and correct labelling is especially critical for terminals L1/ L2/L3/L1'/N (for
the 230 V - 50 Hz model) and for terminals L1/L2/L3/N &1/ 2/ 4 for the 60 Hz (120 V) models. The electrician is
therefore obliged, before installation to check whether the generator is earth-free. As long as this test has not been
carried out all other components for electrical installation must be removed. Once the system has been installed and
inspected, this test should also be performed with all electrical devices (i.e. voltage check between common and
metallic housings) while the generator is running.