SMA America, LLC Electrical connection
Installation Guide SB30-40US-IUS103030 47
6.7.1 DC connection requirements
Cable sizing
All electrical installations must be done in accordance with all local electrical codes and with the
National Electrical Code
®
, ANSI/NFPA 70. For installation in Canada the installations must be done
in accordance with applicable Canadian standards.
When selecting the type and cross-section of the cable in accordance with the routing method,
observe the following requirements:
• For all DC wiring connections use 10 … 6 AWG (6 … 16mm²), +194°F(+90°C) rated
copper wire.
• Use only solid or stranded wire but not fine stranded wire.
Fusing
The DC disconnect for the inverter must have a minimum rating of 600 V DC and 30 A continuous.
The SMA DC disconnect is shipped with four 15 A, 600 V DC fuses (one for each string). The
maximum fuse rating for the four SMA DC disconnect fuses is 20 A, 600 V DC (one for each string).
See "Exchanging the PV String Fuses within the SMA DC Disconnect" on page 85 for details.
Use the free design programs "Solar Design Tools" at www.SMA-America.com to
determine the correct string configuration.
Series fusing may be required depending on the type of PV module used in the system. See
National Electrical Code
®
690.9.
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