SMA SB 240 - Manual (Page 39)

7. Tighten all three screws of the connecting terminal plate using a flat-blade screwdriver (torque:
0.6 Nm).
8. Make sure that all terminals are correctly
allocated.
9. Make sure that all conductors are securely in place.
6.7 Connecting the Sunny Multigate to the Utility Grid
Connect the AC cable of the utility grid to the connecting terminal plate of the Sunny Multigate
labeled Grid according to the following procedure:
Cable requirements:
☐ Only use copper cables.
☐ Use only cables made of solid wire or stranded wires.
☐ Temperature-resistant up to at least +90°C
☐ Conductor cross-section: 1.5 mm² to 6.0 mm²
Requirement:
☐ The Sunny Multigate must be correctly installed in the distribution box.
☐ If an external residual-current device is required, install a type 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 the Sunny Multigate is being commissioned in Italy, an external grid and PV system
protection (SPI) in accordance with the CEI 0-21 standard must additionally be installed.
Overvoltage category:
The Sunny Multigate can be deployed in utility grids of installation category III or lower, as defined
in IEC 60664-1. This means that the Sunny Multigate can be permanently connected to the origin
of an utility grid in a building. In installations involving long outdoor cable routes, additional
measures for overvoltage suppression must be taken so that the overvoltage category is reduced
from IV to III.
Procedure:
1.
Danger to life due to electric shock
• Ensure that the circuit breaker is switched off and that it cannot be reconnected.
6 Electrical Connection SMA Solar Technology AG
Installation Manual 39 SMA-SB240-IA-en-12