SMA STP 50-40 Operating Manual page 37

SMA Solar Technology AG
☐ Conductor cross-section of grounding conductor: 25 mm² to 120 mm²
☐ Conductor cross-section of line conductor and neutral conductor: 35 mm² to 120 mm²
☐ Insulation stripping length: 30 mm
☐ Sheath stripping length: 290 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).
Overview of the required length of the conductor inside the AC connection unit
Figure 11: Interior view of the AC connection unit with dimensions for the conductors (Dimensions in mm)
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).
Operating manual
300
NOTICE
6 Electrical Connection
181
STP50-4x-BE-en-23 37