SMA Sunny Tripower CORE2 - AC cable requirements

8 Electrical Connection
SMA Solar Technology AG
Operating manual STP110-60-BE-en-16 35
☐ The inverter is compatible with type B residual-current devices with a rated residual current of
1100 mA or higher (see Technical Information "Criteria for Selecting a Residual-Current
Device" for information on how to select a residual-current device at www.SMA-Solar.com).
Each inverter in the system must be connected to the utility grid via a separate residual-current
device.
☐ When using residual-current devices with a lower rated residual current, there is a risk of false
tripping of the residual-current device, depending on the system design.
8.1.3 Equipotential Bonding
If components are used in the PV system that require equipotential bonding (e.g., mounting racks,
module frames), these must be connected to a central equipotential panel provided for this
purpose.
Observe the installation guidelines and regulations applicable in your country. The enclosure of the
inverter is not suitable as equipotential bonding. Incorrect implementation of equipotential bonding
can lead to an inverter defect that is not covered under warranty.
8.1.4 Overvoltage category
The product can be used in grids of overvoltage categoryIII or lower in accordance with
IEC60664-1. That means that the product 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).
8.1.5 AC cable requirements
☐ Conductor type: aluminum and copper wire
☐ When using conductors made of aluminum wire, bimetal terminal lugs made of aluminum and
copper must be used to prevent direct contact of the copper bar with the aluminum wire.
☐ Outer diameter: 38mmto56mm
☐ Outer diameter of each AC cable when using the optional AC sealing plate: 14 mm to 32 mm
☐ Conductor cross-section PE: 35 mm² to 240 mm²
☐ Conductor cross-section of line conductor: 70mm² to 240mm²
☐ Insulation stripping length: 30mm
☐ Sheath stripping length: ≤375 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).
Also see:
• Connecting the AC Cable⇒page38