SMA Solar Technology AG 6 Electrical Connection
Installation Manual SB30-50TL-21-IA-en-21 33
6.3 Connection to the Electricity Mains (AC)
6.3.1 Conditions for the AC Connection
• Comply with the connection requirements of your network operator.
Residual-current monitoring unit
The inverter is equipped with an integrated all-pole-sensitive residual current monitoring unit.
Consequently, the inverter can differentiate automatically between residual currents and "normal"
capacitive leakage currents.
If regulations in the country of installation stipulate an external residual current device, you must use
a device with a tripping threshold of 100 mA or more.
Overvoltage category
The inverter can be deployed in grids of installation category III or lower, as defined under
IEC 60664-1. This means that it can be permanently connected at the grid-connection point in a
building. In installations involving long cable routes outdoors, additional overvoltage-reducing
measures must be taken so that the overvoltage category is reduced from IV to III (for further
information, see the Technical Information "Overvoltage Protection" at www.SMA-Solar.com).
Cable dimensioning
The cable must be dimensioned in accordance with any local and national directives on cable
dimensions which specify requirements for the minimum conductor cross-section. Cable dimensioning
factors are e.g.: nominal AC current, type of cable, type of routing, cable bundling, ambient
temperature and maximum specified line losses (for calculation of line losses, see design software
"Sunny Design" from software version 2.0 at www.SMA-Solar.com).
Cable requirements
Object Description Value
A External diameter 12 mm to 21 mm
B Conductor cross-section maximum 10 mm²
C Stripping length approx. 12 mm
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