6.3
AC Connection
6.3.1
Requirements for the AC Connection
Cable requirements:
• External diameter: 12 mm to 21 mm
• Conductor cross-section: 1.5 to 6 mm²
• Insulation stripping length: 18 mm
• The cable must be dimensioned in accordance with the local and national directives for the
dimensioning of cables. The requirements for the minimum wire size derive from these
directives. Examples of factors influencing cable dimensioning are: nominal AC current, type of
cable, routing method, cable bundling, ambient temperature and maximum desired line losses
(for calculation of line losses, see the design software "Sunny Design" from software
version 2.0 at www.SMA-Solar.com).
Load-break switch and cable protection:
Damage to the inverter due to the use of screw-type fuses as load-break switches
Screw-type fuses (e.g. DIAZED fuse or NEOZED fuse) are not load-break switches.
• Do not use screw-type fuses as load-break switches.
• Use a load-break switch or circuit breaker as a load disconnection unit (for information and
design examples, see the Technical Information "Circuit Breaker" at www.SMA-Solar.com).
☐ In PV systems with multiple inverters, protect each inverter with a separate three-phase circuit
breaker. Make sure to observe the maximum permissible fuse protection (see Section 11
"Technical Data", page 59). This will prevent residual voltage being present at the
corresponding cable after disconnection.
☐ Loads installed between the inverter and the circuit breaker must be fused separately.
Residual-current monitoring unit:
☐ If an external residual-current device is required, install a residual-current device which trips at
a residual current of 100 mA or higher (for details on selecting a residual-current device, see
the Technical Information ""Criteria for Selecting a Residual-Current Device"" at www.SMA-
Solar.com).
☐ If a residual-current device with a tripping threshold of 30 mA is required and used, you must
set the tripping threshold of the residual-current device in the inverter to 30 mA (see
Section 8.7, page 51).
6 Electrical Connection
SMA Solar Technology AG
Operating Manual
29
STP5-12TL-20-BE-en-15
Содержание 10000TL
Страница 74: ...www SMA Solar com ...
