6 Electrical Connection
SMA America, LLC
36
SB3-5TLUS22-IA-en-12
Installation Manual
6.3 AC Connection
6.3.1 Conditions for the AC Connection
Cable requirements:
☐ Conductor cross-section L1, L2 and N: 12 AWG to 6 AWG (3.3 mm² to 13.3 mm²)
☐ Conductor cross-section equipment grounding conductor: 6 AWG (13.3 mm²)
☐ Isolation stripping length:
1
⁄
2
in. (12 mm)
☐ Solid or stranded wire of copper with no more than 19 single wires
☐ The cable must be designed for the maximum temperature of the AC terminal of
+221°F (+105°C).
☐ The cables must be designed in accordance with local directives and the
National Electrical
Code
®
. Influencing factors for cable dimensioning are, for example, the nominal AC current,
the type of cable, the routing method, cable bundling, ambient temperature, and maximum
desired line losses.
Additionally required mounting material (not included in the scope of delivery):
☐ 1 conduit fitting (
3
⁄
4
in. (19 mm)), rain-tight or for wet locations when installed outdoors
☐ 1 conduit (
3
⁄
4
in. (19 mm))
Load-break switch and cable protection:
• In plants with multiple inverters, protect every inverter with a separate circuit breaker or another
overcurrent protective device. Observe the maximum permissible fuse protection
(see Section 13 "Technical Data", page 77). In doing so, you avoid residual voltages being
present at the respective cables after a disconnection from the utility grid.
• Loads installed between the inverter and the circuit breaker must be protected separately.
Damage to the inverter through the use of fuses as disconnecting units in the output circuit
of the inverter
Fuses must not be used as disconnecting units, even if they are installed in a fuse holder listed as
being a load-break switch.
• If fuses are installed as overcurrent protection in the output circuit of the inverter, a
disconnection switch or another load-break switch suitable for the load must be installed as a
disconnecting unit in the output circuit of the inverter.
• Use a circuit breaker as (a) load-break switch, for example. These can be used both as
overcurrent protection and as disconnecting unit.
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