Huawei SUN2000L - Page 44

SUN2000L-(2KTL-5KTL)
User Manual
5 Electrical Connections
Issue 02 (2017-12-12)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
37

The SUN2000L is embedded with a residual current monitoring unit (RCMU). Only a
single-phase circuit breaker or a similar AC load breaking device is required to function as
the external AC switch (shown by G in Figure 5-2) to ensure that the SUN2000L can be
safely disconnected from the power grid.

If the external AC switch can perform earth leakage protection, the rated leakage action
current should be greater than or equal to 100 mA.

If multiple SUN2000Ls connect to the general residual current device (RCD) through their
respective external AC switches, the rated leakage action current of the general RCD
should be greater than or equal to the number of SUN2000Ls multiplied by 100 mA.

A knife switch cannot be used as an AC switch.
Table 5-2 Cable description
No.
Cable
Type
Conductor
Cross-sectional
Area Range
Outer
Diameter
Source
1
DC input
power cable
Standard PV cable in the
industry (recommended
model: PV1-F)
4–6 mm
2
4.5–7.8 mm
Prepared by
the customer
2
Battery cable
Standard PV cable in the
industry (recommended
model: PV1-F)
4–6 mm
2
4.5–7.8 mm
Prepared by
the customer
3
Signal cable
Four-core outdoor shielded
twisted pair
0.25–1 mm
2
4–11 mm
Prepared by
the customer
4
AC output
power cable

Not using the PE
equipotential point at the
AC output port: two-core
(L and N) outdoor copper
cable

Using the PE
equipotential point at the
AC output port:
three-core (L, N, and PE)
outdoor copper cable
4–6 mm
2
10–21 mm
Prepared by
the customer
5
PE cable
Single-core outdoor copper
cable with an M6 OT
terminal
4–10 mm
2
N/A
Prepared by
the customer
The PE point at the AC output port is used only as a PE equipotential point, and cannot
substitute for the PE point on the enclosure.