Connecting The Strings To Rapid Shutdown Box - SMA RSB-2S-US-10 Manuel D'installation

6 Electrical Connection
6.6

Connecting the Strings to Rapid Shutdown Box

Up to four input strings and two output strings can be connected to the Rapid Shutdown Box. In the
Rapid Shutdown Box, two of the four input strings are connected in parallel. The input strings must
be connected to the DC conductors fitted with MC4 connectors that lead from the Rapid Shutdown
Box. The output strings must be connected to the corresponding terminal blocks inside the Rapid
Shutdown Box.
Faulty operation of the inverter due to incorrect connection of the output
strings to the Rapid Shutdown Box
The output strings must lead to the same inverter if two output strings are connected to the
Rapid Shutdown Box. The operation of at least one inverter is interrupted if the two output
strings are connected to different inverters.
• Connect only output strings to the terminal block A and B which are leading to the same
inverter.
Procedure:
• Connect the output strings.
• Connect the input strings.
Connecting the Output Strings
Additionally required material:
☐ Conduit (trade size: 21 mm (0.75 in) or smaller with suitable reducer bush)
☐ Raintight or liquidtight conduit fitting (trade size: 21 mm (0.75 in) or smaller with suitable
reducer bush)
Requirements on･the conductors:
☐ Conductor type: copper wire
☐ The conductors must be made of solid wire, stranded wire or fine stranded wire. When using
fine stranded wire, bootlace ferrules must be used.
☐ Conductor cross-section: 4 mm² to 10 mm² (12 AWG to 6 AWG)
☐ The maximum permitted temperature for the terminal blocks for the connection of the output
strings of +90°C (+194°F) must be observed.
☐ The conductors with regards to its ampacity, rated temperatures, operating conditions and its
power loss must be made in accordance with the local standards and the National Electrical
®
Code ANSI/NFPA 70 or the Canadian Electrical Code
30 RSS-US-IA-xx-14
SMA Solar Technology America LLC
®
CSA C22.1.
Installation Manual