SMA STP 5000TL - Manual (Page 26)

☐ Maximum conductor cross-section: 10 mm²
☐ Insulation stripping length of the conductors: 18 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 at
www.SMA-Solar.com).
Load-break switch and cable protection:
☐ 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 53). 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 8.5, page 45).
Overvoltage category:
The inverter can be used in grids of installation category III or lower in accordance with
IEC 60664-1. That means that the inverter can be permanently connected to the grid-connection
point of a building. In case of installations with long outdoor cabling routes, additional measures to
reduce overvoltage category IV to overvoltage category III are required (see the Technical
Information "Overvoltage Protection" at www.SMA-Solar.com).
Grounding conductor monitoring:
The inverter is equipped with a grounding conductor monitoring device. This grounding conductor
monitoring device detects when there is no grounding conductor connected and disconnects the
inverter from the utility grid if this is the case.
Connection of additional grounding
In some countries additional grounding is a basic required. In each case, observe the locally
applicable regulations.
• If additional grounding is required, connect an additional grounding with the same cross-
section as the connected grounding conductor to the connecting terminal plate for the AC
cable (see Section 6.3.3 "Connecting Additional Grounding", page 28). This prevents
touch current if the grounding conductor at the connecting terminal plate for the AC cable
fails.
6 Electrical Connection SMA Solar Technology AG
Operating Manual STP5-10TL-20-BE-en-13 26