6 Electrical Installation System Manual
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Cables for one polarity or phase should be of the same type and specification.
Flame retardant and fire resistant cables are recommended.
Overloading operation of cables is strictly forbidden.
6.6 General principles for cable connections
Based on the cable entries design on the bottom of the MV Station, cables inside and
outside the MV Station should be laid between the MV Station base and MV Station bottom.
Pass the cables to each device through the cable entries on the bottom of the MV Station.
The cable length should be designed properly to avoid redundancy.
Connect the power cable first, and then connect the control and communication cables.
Please refer to corresponding manuals for the specific cable connections of transformer.
6.7 DC Connection
6.7.1 Checking before Connection
Check the following items before cable connections.
Check the open-circuit voltage of the PV array to ensure the open-circuit voltage is
within the max. DC voltage of the MV Station.
Mark the negative and positive polarity of the cable.
Check the PV modules for possible ground fault.
Open-circuit voltage of the PV array should not exceed the max. DC voltage of
the MV Station. The MV Station may be damaged if otherwise.
If the ground fault is found, it must be removed before any DC connection.
Strictly follow all the instructions when connecting the cables.
Observe all the safety rules required by the PV array manufacture.
Start DC connection only when all checks and measurements meet requirements.
6.7.2 DC Cable Connection
The location and size of the wiring copper bar on the DC side is shown in the following
figure, unit: mm.
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