SMA 600-US - Manual (Page 33)

SMA America, LLC 6 Electrical Connection
Installation Manual CU600-1000US-IA-en-10 33
6.5 Connecting the PV Array to the Connection Unit 600-US
Cable requirements:
☐ The DC cables of the PV array must be designed in accordance with the installation
requirements applicable on site and for temperatures of +194°F (+90°C).
☐ The DC input and output circuits are isolated from the enclosure and that system grounding, if
required by Section 250 of the National Electrical Code
®
, ANSI/NFPA 70, is the responsibility
of the installer.
☐ The maximum cable length, which is dependent on the conductor cross-section, must be
adhered to.
☐ Cable type: copper wire
☐ Conductor cross-section: AWG 12 to AWG 8 (4 mm² to 8 mm²)
Requirements:
☐ The conduits must be correctly connected to the Connection Unit (see Section 6.3).
☐ The DC switch-disconnector must be switched OFF and the lid must be dismantled.
Procedure:
Connect the DC cables of the PV array to each INPUT A and INPUT B as follows:
3. Lead the DC cables of the PV array through the connected conduits into the interior of the
Connection Unit.
4. Strip the insulation of all cables
23
⁄
64
in. (9 mm).
1.
Danger to life due to electric shock
• Make sure that all devices (e.g. inverter) connected to the Connection Unit are switched
off and protected against reconnection (see manual of the respective device).
• Cover the PV modules.
2.
Danger to life due to electric shock
The strings in the Connection Unit are combined to one main string. If there is reverse polarity
of a PV string, there can be short-circuit current flowing when string fuses are inserted, string
safety levers are closed, and the DC switch-disconnector is open.
• Open all safety levers all the way.