SMA SMC 9000TL Installation - Manual (Page 34)

34 SMC9-11TLRP-IA-en-51 Installation Manual
6 Electrical Connection SMA Solar Technology AG
Cable requirements:
☐ Conductor cross-section without bootlace ferrule: maximum 25 mm².
☐ Conductor cross-section with bootlace ferrule: maximum 10 mm².
☐ At a conductor cross-section of 25 mm², a flexible cable must be used.
☐ When designing the conductor cross-section, all factors must be taken into consideration
(see the design program "Sunny Design" from software version 2.0 at www.SMA-Solar.com).
☐ The maximum cable length subject to conductor cross-section must be observed. Useful hint: If
you group three inverters to a three-phase plant with symmetrical feed-in, the line losses are
halved. That doubles the maximum cable length possible.
☐ External diameter of the cable corresponds to the clamping range of the cable gland:
18 mm ... 32 mm.
☐ The cable must be dimensioned in accordance with any local and national guidelines on cable
dimensions which specify requirements for the minimum conductor cross-section. 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 design software Sunny Design from software version 2.0 www.SMA-Solar.com).
Switch-disconnector and cable protection:
WaHiw_Schraubsicherungen als Lasttrenneinrichtung
• In plants with multiple inverters, protect every inverter with a separate miniature circuit-breaker.
Observe the maximum permissible fuse protection (see section 12 "Technical Data", page 82).
That prevents residual voltage being present at the corresponding cable after disconnection.
• Loads installed between the inverter and the miniature circuit-breaker must be protected
separately.
SMC_Fehlerstrom-Überwachungseinheit
F Fuse holders For installing the string fuses
G Connection area and slot For communication interfaces
6.3 AC Connection
6.3.1 Conditions for AC Connection
Damage to the inverter due to the use of screw-type fuses as switch-disconnectors
Screw-type fuses (e.g. DIAZED fuse or NEOZED fuse) are not switch-disconnectors.
• Do not use screw-type fuses as switch-disconnectors.
• Use a switch-disconnector or miniature circuit-breaker as a load disconnect unit (for information
and design examples, see the Technical Information "Miniature Circuit-Breaker" at
www.SMA-Solar.com).
Item Designation Explanation