SMA SC 500HE-US Installation - Manual (Page 71)

SMA America, LLC 8 Electrical Connection
Installation Manual SC500HEUS-IA-US_en-14 71
8.8 Connecting protective earth
Refer to section 8.4.4 for general requirements for DC, AC and PE connection of the Disconnect Unit.
8.8.1 Additional cable requirements for PE connection
• Use the screw terminals or cable lugs to connect the AC cables to the AC breakers as described
in section 8.7.3.
• The conductor size of the PE connection is depending on the installed over-current protection
device. For determination see National Electrical Code
®
, ANSI/NFPA 70 article 250.122.
• The Photovoltaic System Grounding must be installed per the requirements os sections 690.41
through 690.47 of the National Electrical Code
®
, ANSI/NFPA 70 and is the responsibility of
the installer.
8.8.2 Connecting protective earth to Terminal Blocks
1. Strip the cable by about 1.2 in. (30 mm).
2. Open the screw terminal completely.
3. Plug the copper inner conductor of the cable into
the screw terminal.
4. Tighten the screw terminal using an Allen key. For
required torque see tables above.
5. Connect all grounding cables as described above.
/05*$&
The AC outputs are isolated from the enclosure and the system grounding, so that the
AC output and neutral are not bonded to ground. If required by section 250 of the
National Electrical Code
®
, ANSI/NFPA 70, the installer is responsible for this grounding.
A Screw terminals for grounding the AC and
DC cables.
L+
PE
L+
PE
A
1.2 in.