SMA SC 500HE-US Installation - Manual (Page 58)

8 Electrical Connection SMA America, LLC
58 SC500HEUS-IA-US_en-14 Installation Manual
8.4.4 Cable requirements for DC, AC and PE connection
☐ Connect all cable using copper or aluminium conductors that are suitable for temperatures of
+194°F (+90°C) and in accordiance with National Electrical Code
®
ANSI/NFPA 70.
☐ Use the screw terminal or the screws included in scope of delivery for mounting cable lugs only.
Cable lugs have to be UL listed compression lugs with two securement holes (
1
/
2
in. (13 mm)
in diameter) and a distance between the holes of 1
3
⁄
4
in. (44 mm). Both holes have to be
utilized in installation. The width of the lugs has to exceed the washer diameter of 1
1
⁄
4
in.
(32 mm) to ensure defined torque values listed below.
The screw terminals can be connected with 1 or 2 conductors each.
☐ Use the screw terminals or cable lugs to connect the DC cables.
☐ For individual cable sizing refer to article National Electrical Code
®
310.
Screw terminals are pre-mounted upon delivery. If they have to be fixed again on the copper busbar,
use a torque of 27.5 ft.-lbs. (37 Nm).
8.4.5 Additional cable requirements for DC connection
• Use the cable lugs to connect DC cables.
• Connect 2 conductors per input terminal maximum. Both conductors must have the same sizing.
• The DC inputs are isolated from the enclosure and the system grounding. If required by section
250 of the National Electrical Code
®
, ANSI/NFPA 70, the installer is responsible for this
grounding.
Connection method Cable size Torque
Cable fixing in screw terminal 4 AWG to 600 kcmil
(25 mm² to 304 mm²) 41.5 ft.-lbs. (56.5 Nm)
Cable lug, aluminum on
copper busbar 4 AWG to 800 kcmil
(25 mm² to 405 mm²) 27.5 ft.-lbs. (37 Nm)
Cable lug, copper on
copper busbar 4 AWG to 800 kcmil
(25 mm² to 405 mm²) 44.5 ft.-lbs. (60 Nm)
Maximum number of DC inputs: 9 x PV+, 9 x PV − , 9 x ground
Maximum number of DC fuses: 9 (sized 450 A maximum)
DC input voltage: 330-600 V
Maximum DC current: 1600 A