SMA Solar Technology AG GRID-CONNECT-BOX 12, Operating Manual, Page: 18 / 40

6 Electrical Connection SMA Solar Technology AG
18 GRID-BOX-12-3-20-BE-en-11 Operating Manual
6.1.2 Enclosure Openings in the Floor
Figure 9: Position of the enclosure openings
6.2 Deactivating All-Pole Disconnection
The technical connection requirements of the grid operator and the local standards and directives specify whether the
multicluster system, in the event of grid failure, disconnects from the utility grid at all poles or only the line conductors. The
Grid-Connect-Box is always supplied with an all-pole disconnection function. If all-pole disconnection is not permitted,
you must deactivate the Grid-Connect-Box all-pole disconnection function. To do this, insert the two-pole N bridge
included in the scope of delivery as follows:
Procedure:
• For use of the Grid-Connect-Box without all-pole disconnection,
connect the spring-cage terminal N on X301:5 to the spring-cage
terminal N on X301:6 . To do this, plug the two-pole N bridge
included in the scope of delivery into the spring-cage terminals
from below.
6.3 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.
The line conductors, 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 Multicluster-Box power cables into the Grid-Connect-Box (see Section 9.3, page 25).
2. Connect the grounding conductor to the spring-cage terminal
PE at terminal X301:7 (see Section 9.4.1, page 26).
3. Connect the neutral conductor to the spring-cage terminal N at terminal X301:6 .
4. Connect the line conductors to the spring-cage terminals L1 , L2 and L3 at the terminals X301:8-10 .
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 included in the scope of delivery for this.
Position Explanation
A Enclosure openings for the control cables
B Enclosure openings for the Multicluster-Box power cables
C Enclosure openings for the utility grid power cables