Connecting The Rapid Shutdown Box And Rapid Shutdown Controller Together - SMA RSC-1X-US-10 Installation Manual

6 Electrical Connection
6.4 Connecting the Rapid Shutdown Box and Rapid
Shutdown Controller Together
Additionally required material (not included in the scope of delivery):
☐ Conduit: either a separate conduit (trade size: 16 mm (0.5 in) or smaller with suitable reducer
bush) or use the conduit of the output strings to lay the conductors.
☐ If the conductors for the connection of the Rapid Shutdown Controller are to be laid in a
separate conduit: raintight or liquidtight conduit fitting (trade size: 16 mm (0.5 in) or smaller
with suitable reducer bush).
☐ When laying a tray cable for exposed run (TC-ER): use cable gland which is suitable for the
cable and the enclosure opening.
Requirements for the conductors:
☐ When laying in outdoor areas without conduit, a tray cable for exposed run (TC-ER) must be
used.
☐ Conductor type: copper wire
☐ Number of conductors: 5
☐ If the conductors for the connection of the Rapid Shutdown Controller are laid in one conduit
together with the output strings, the conductors for the connection of the Rapid Shutdown
Controller must be insulated for the maximum PV system voltage.
☐ 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: 0.75 mm² to 1.5 mm² (18 AWG to 16 AWG)
☐ Maximum length of the conductors from the Rapid Shutdown Box to the Rapid Shutdown
Controller: 50 m (164 ft)
Complying with the requirements for class 2 circuits
The circuit of the Rapid Shutdown Controller meets all requirements for class 2 circuits. The
maximum open-circuit voltage is 20 V and maximum short-circuit current is 400 mA.
Information on laying tray cables for exposed run (TC-ER)
The procedure for using conduits is described in this section. Instead of conduits, you can also
use tray cables for exposed run (TC-ER).
• When using tray cables for exposed run (TC-ER), select suitable cable glands and attach
to the enclosure opening instead of the conduit. When doing so, ensure that the
enclosure opening is sealed and no moisture can enter.
22 RSS-US-IA-xx-14
SMA Solar Technology America LLC
Installation Manual