6 Electrical Connection
SMA Solar Technology AG
Operating manual
19
NA-BOX-12-3-20-BE-en-12
6.1.2
View from Below
B
C
A
Figure 8: Position of the enclosure openings
Position
Designation
A
Enclosure openings for the control cables
B
Enclosure openings for the power cables of the Multicluster-Box
C
Enclosure openings for the power cables of the utility grid
6.2
Connecting the Multicluster-Box
Cable requirements:
☐ Conductor material: copper
☐ Conductor cross-section: 50 mm² to 150 mm²
☐ The power cables must be ground-fault and short-circuit protected.
☐ Line conductors, the neutral conductor and grounding conductor must have the same cross-section.
☐ The AC conductors and DC conductors must always be routed in separate cables.
Procedure:
1. Insert the power cables into the product (see Section 9.2, page 25).
2. Connect the grounding conductor to the spring-cage terminal
PE
at terminal
X201:6
(see Section 9.3,
page 26).
3. Connect the neutral conductor to the spring-cage terminal
N
at terminal
X201:10
.
4. Connect the line conductors to the spring-cage terminals
L1
,
L2
and
L3
at the terminals
X201:7-9
.
5. Ensure that a right-hand rotating magnetic field is present at the connection point of the Multicluster-Box.
6. Provide for strain relief of the power cables in the spring-cage terminal by attaching them to the appropriate cable
support rail. Use the strain reliefs and counter-sleeves provided.
6.3
Connecting the Utility Grid
Cable requirements:
☐ Conductor material: copper
☐ Conductor cross-section: 50 mm² to 150 mm²
☐ The power cables must be ground-fault and short-circuit protected.
☐ Line conductors, the neutral conductor and grounding conductor must have the same cross-section.
☐ The AC conductors and DC conductors must always be routed in separate cables.
Procedure:
1. Insert the power cables into the product (see Section 9.2, page 25).
