22
Table 5-3 Cable Requirements
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1 DC cable
Outdoor multi-core
copper wire cable
complying with
1100 V and 30 A
standard
6 mm–9 mm 4 mm
2
–6 mm
2
2 Ethernet
cable
CAT 5E outdoor
shielded network
cable
5.3 mm–7 mm 8 * 0.2 mm
2
3 Meter
RS485
cable
(1)
Shielded twisted
pair
5.3 mm–7 mm
2 * (0.5–1.0) mm
2
4
AC cable
(2)
Outdoor 5-core
copper wire cable
SG5.0RT to
SG12RT：10
mm–21 mm
SG5.0RT to
SG12RT：4 mm
2
–6
mm
2
SG15RT to
SG20RT：14
mm–25 mm
SG15RT to
SG20RT：6 mm
2
–
10 mm
2
5
Additional
Grounding
cable
Outdoor single-
core copper wire
cable
The same as that of the PE wire in the AC
cable
(1) The cable requirements for CCOOMM22 terminal connection are the same.
(2) All the AC wires should be equipped with correctly colored cables for distinguishing.
Please refer to related standards about the wiring color.
5.4 Additional Grounding Connection
• Since the inverter is transformerless, neither the negative pole nor the
positive pole of the PV string must 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 thoes terminals
are both grounded reliably.
5 Electrical Connection User Manual
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