SUN2000-(25KTL, 30KTL)-US
User Manual
5 Electrical Connections
Issue 03 (2017-04-01)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
53
Grou
nd
Point
Meaning Ground Screw
Model
Tightening
Torque
Connecting the
Ground Cable
1
PV side
ground
point
M4
1.2 N·m
Connect either
ground point for PV
side grounding.
2
M6
5 N·m
3
Protection
ground
point
M6
5 N·m
Connect either
ground point for
protective earthing.
4
Proper grounding for the SUN2000 can help resist the impact of the surge voltage and improve the
electromagnetic interference (EMI) performance. Connect the ground cable before connecting AC
power cables, DC power cables, and communications cables.
Select ground points for PV side grounding and protective earthing based on the principle of easy
operation.
For a system with multiple SUN2000s connected in parallel, connect the ground cables for all
SUN2000s to the same ground copper bar to ensure equipotential connections.
The following describes how to connect ground cables to ground points 1 and 4. Ground cables can
be connected to ground points 1 and 4 in the common way or through a pipe. For details about how
to handle the bottom waterproof connectors in these two methods, see
5.1 Common Cable
Connection Operations
.
Prerequisites
The ground cables and OT terminals are prepared.
Connecti
on
Method
Recommended Ground Cable
OT Terminal
Connectio
n through
a pipe
8 AWG outdoor copper-core cable
M4 and M6
Common
connection
For ground points 1, 2, and 3, an 8 AWG outdoor
copper-core cable is recommended.
For ground point 4, a single cable is appropriate,
and an 8 AWG outdoor copper-core cable is
recommended. The PE wire in a multi-core AC
output power cable can also be connected by
following the instructions in
Procedure (Common
Connection)
of
5.4 Connecting AC Output Power
Cables
.
If cables are to be connected through a pipe, prepare a pipe by yourself. The recommended
pipe outer diameter of the cable hole (AC OUTPUT) for ground point 4 is 42.47 mm (1.67
in.). The recommended pipe outer diameter of the cable hole (GND) for ground point 1 is 16.5
mm (0.65 in.).