SMA SB 6000TL‑US Installation - Manual (Page 14)

2 Safety SMA America, LLC
14 SB6-11TL-US-IA-en-13 Installation Manual
Grounding the PV modules
This Sunny Boy is a transformerless inverter. That is why it has no galvanic isolation. Do not ground
the DC electric circuits of the PV modules connected to the Sunny Boy. Only ground the mounting
frame of the PV modules.
If you connect grounded modules to the Sunny Boy, the error message F-Riso is displayed.
The DC electric circuit is connected to the AC grid during operation.
Fuses
The Sunny Boy and the DC-Disconnect do not contain string fuses.
According to the National Electrical Code
®
of 2008, Section 690.35, string fuses are necessary in
order to protect the PV plant against reverse currents.
Arc-Fault Circuit Interrupter AFCI
Only the following Sunny Boy types are equipped with an automatic arc-fault circuit interrupter
(AFCI):
• SB 6000TLUS-12
• SB 7000TLUS-12
• SB 8000TLUS-12
• SB 9000TLUS-12
• SB 10000TLUS-12
• SB 11000TLUS-12
The 2011 edition of the National Electrical Code
®
, Section 690.11, stipulates that newly installed
PV plants attached to a building must be fitted with a means of detecting and disconnection of serial
electric arcs (AFCI) on the PV side.
An electric arc with a power of 300 W or greater must be interrupted by the AFCI in the time specified
by UL 1699B. A tripped AFCI may only be reset manually.
The arc-fault circuit interrupter (AFCI) can be deactivated in the "Installer" mode via the
communication device if this function is not desired.