User and installation manual

6 Electrical Connection
SMA Solar Technology AG
Installation Manual SBSxx-US-10-IA-xx-12 33
Load-break switch an cable protection:
☐ In PV systems with multiple inverters, protect each inverter with its own overcurrent protective
device. Observe the maximum permissible fuse protection (see Section10 "Technical Data",
page69). This will prevent residual voltage from being present at the corresponding
conductor after disconnection.
☐ The load-break switch or circuit breaker must be listed (see National Electrical Code
®
ANSI/
NFPA 70) or Canadian Electrical Code
®
CSA C22.1).
☐ Loads installed between the inverter and the overcurrent protective device must be fused
separately.
☐ The overcurrent protective device for the AC output circuit is to be provided by others.
6.2.2 Connecting the Inverter to the Utility Grid
Requirements:
☐ All electrical installations must be carried out in accordance with the local standards and the
National Electrical Code
®
ANSI/NFPA 70 or the Canadian Electrical Code
®
CSA C22.1.
☐ The AC and DC electric circuits are isolated from the enclosure. If required by the National
Electrical Code
®
ANSI/NFPA 70 or Canadian Electrical Code
®
CSA C22.1, the installer is
responsible for grounding the system.
☐ The connection requirements of the grid operator must be met.
☐ The grid voltage must be within the permissible range. The exact operating range of the
inverter is specified in the operating parameters.
Procedure:
1. Disconnect the AC circuit breaker and secure it against reconnection.
2. If the enclosure lid of the Connection Unit is mounted, remove it as follows:
• Unscrew all six screws (TX25) and carefully remove the enclosure lid towards the front.
While doing so, note that the assembly on the enclosure lid of the Connection Unit and
the communication assembly in the Connection Unit are connected via a ribbon cable.
During the first installation, the ribbon cable is to be connected only to the LED assembly
on the enclosure lid of the Connection Unit.
• Disconnect the ribbon cable from the socket on
the communication assembly. During the first
installation, the ribbon cable is to be connected
only to the assembly on the enclosure lid of the
Connection Unit.
3. Remove the adhesive tape from the enclosure opening for the AC connection.
4. Insert the conduit fitting into the opening and tighten from the inside using the counter nut.
5. Attach the conduit to the conduit fitting.
ENGLISH