5 Electrical Connection
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* A copper to aluminum adapter terminal is required when an aluminum cable is used.
For details, refer to "5.9.3 Aluminium Cable Requirements".
Table 5-2 PE wire requirements
Phase wire cros
s section S
PE wire cross
section
Outer Diamet
er
Note
S
＞
35 mm
²
S/2
12~25mm
The specifications are valid only when the phase wire and PE
wire use the same material. If otherwise, ensure that the cross
section of PE wire produces a conductance equivalent to that
of the wire specified in the table.
Table 5-3 Power cable for tracking system
5.3 Connecting the PE Cable
WARNING
Since the inverter is a transformerless inverter, neither the negative pole nor the positive pole of the
PV string can be grounded. Otherwise, the inverter will not operate normally.
Connect the additional grounding terminal to the protective grounding point before AC cable
connection, PV cable connection, and communication cable connection.
The ground connection of this additional grounding terminal cannot replace the connection of the PE
terminal of the AC cable. Make sure those terminals are both grounded reliably.
5.3.1 Additional Grounding Requirements
All non-current carrying metal parts and device enclosures in the PV power system should be grounded, for example,
brackets of PV modules and inverter enclosure. When there is only one inverter in the PV system, connect the additional
grounding cable to a nearby grounding point.
When there are multiple inverters in the PV system, connect grounding points of all inverters and the PV array frames
to the equipotential cable (according to the onsite conditions) to implement an equipotential connection.
5.3.2 Connection Procedure
Step 1 Prepare the cable and terminal.
Step 2 Remove the screw on the grounding terminal and fasten the cable with a wrench.
Step 3 Apply paint to the grounding terminal to ensure corrosion resistance.
L1
L2=L1+3mm
L3=2L1
D
8.4
≤
D
≤
12.5mm
FIG 5-2 Install ground cables
Cable
Cable Type
Conductor Cross-Secti
onal Area
Outer Diameter
Voltage Level
Power
cable
for
tracking system
Outdoor copper
conductor cable
2 or 3 x 4~10mm
²
12~25mm
Consistent with selected AC
cable
