Sungrow SG33CX, Руководство пользователя

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User Manual 5 Electrical Connection
31
Tab. 5-2 PE wire requirements
Phase wire cross section
S PE wire cross
section
Note
16
＜
S
≤
35mm
2
16 mm
2
The specifications are
valid only when the phase
wire and PE wire use the
same
material. If
otherwise, ensure that the
cross section of the PE
wire
produces a
conductance equivalent to
that of the wire specified in
the table.
S
＞
35 mm
2 S/2
5.4 Additional Grounding Connection

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.
5.4.1 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.
The additional grounding terminal of the single inverter requires near-end
grounding.
When there are multiple inverters, additional grounding terminals of all these
inverters and grounding points of the PV module brackets should be connected
together first and then to an equipotential line, to ensure equipotential
connection. Specific operation depends on onsite conditions.
5.4.2 Connection Procedure
Step 1
Prepare the cable and OT/DT terminal.