SMA SUNNY TRIPOWER 12000TL-US - Connecting the Inverter to the Utility Grid

6 Electrical Connection
SMA Solar Technology America LLC
Installation Manual STPTL-US-10-IA-xx-20 29
Load-break switch and cable protection:
NOTICE
Damage to the inverter due to the use of screw-type fuses as load-break
switch
Screw-type fuses are not load-break switches.
• Do not use screw-type fuses as load-break switches.
• Use a load-break switch or a circuit breaker for load disconnection.
☐ In PV systems with multiple inverters, protect each inverter with a separate three-phase circuit
breaker. Observe the maximum permissible fuse protection (see Section14 "Technical Data",
page71). This will prevent residual voltage from being present at the corresponding cable
after disconnection.
☐ The load-break switch or circuit breaker must be listed (seeNational Electrical Code
®
, ANSI/
NFPA 70)
☐ Loads installed between the inverter and the circuit breaker must be fused separately.
☐ The overcurrent protection for the AC output circuit is to be provided by others.
Compatible grid configurations:
Device 480V / 277V WYE 480VDelta
STP 12000TL-US-10 Yes No
STP 15000TL-US-10 Yes No
STP 20000TL-US-10 Yes No
STP 24000TL-US-10 Yes No
STP 30000TL-US-10* Yes Yes**
* A neutral conductor connection is necessary for the 480V / 277V WYE. A neutral conductor
connection is not necessary for the 480V Delta.
** For connection to 480 V Delta commercial services where co-located loads may result in recurring and
persistent line-to-ground faults (effectively resulting in a corner grounded Delta grid configuration),
inverters must be protected from excessive line-to-ground voltages by isolating the PV system from the
source(s) of the fault(s).
6.3.2 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, 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.
ENGLISH