6 Electrical Connection
SMA Solar Technology America LLC
Installation Manual
RSS-US-IA-xx-14
18
6
Electrical Connection
6.1
Safety during Electrical Connection
NOTICE
Damage to the Rapid Shutdown Box from moisture and dust ingress.
Dust and moisture ingress can damage the Rapid Shutdown Box and impair its functionality.
• Do not open the Rapid Shutdown Box during rain, snow or high levels of humidity (> 95%).
• Only use listed rain-tight or liquid-tight conduit fittings to attach the conduits to the enclosure.
SMA recommends using conduit fittings with flat, pliable, thick rubber sealing gaskets. The
sealings should be roughly 2.54 mm (0.1 in /
7
/
64
in) in thickness. SMA recommends
against using thinner, harder sealings (typically yellow or green colored). These sealing
types may not make reliable seals for this application. These sealings are approximately
1.9 mm (0.075 in /
5
/
64
in) thick or less. SMA recommends against and does not accept
using conduit fittings with round cross section and o-ring type sealings as these types of
seals are not reliable for this application.
• Seal all unused openings tightly.
Electrical installations
All electrical installations must be carried out in accordance with the local standards and the
National Electrical Code
®
ANSI/NFPA 70 or the Canadian Electrical Code
®
CSA C22.1.
• The electrical connection of the Rapid Shutdown System may only be made by qualified
persons with appropriate skills.
• Ensure that no cables used for electrical connection are damaged.
The Rapid Shutdown function is only available if strings are correctly
connected at the inverter.
The Rapid Shutdown Box controls only strings which are connected to a Rapid Shutdown Box.
The Rapid Shutdown function is not available if the strings from a Rapid Shutdown Box are
connected in parallel with any string not connected to a Rapid Shutdown Box.
• Do not connect any output strings of various Rapid Shutdown Boxes in parallel to a single
input of an inverter or to another parallel connection point.
• The output strings of the Rapid Shutdown Box must not be connected in parallel.
• Always connect the output strings of the Rapid Shutdown Box to the same inverter. The
output strings must not be connected to various inverters.
ENGLISH
Summary of Contents for RSB-2S-US-10
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