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6 Electrical connection
3. Plug the copper conductor of the cable into the screw terminal and tighten it with the specified
torque (see section 6.2 "Cable requirements", page 32).
4.
Torque at pre-mounted screw terminals
The screw terminals are pre-mounted upon delivery.
If necessary, tighten the screw terminal to the busbar again using a torque wrench with a
torque of 27 ft‒lbs. (37 Nm).
6.3.3 Connecting DC cables to DC load break switch with cable
lugs
Voltage is present in PV modules exposed to light. Death resulting from electric shock.
• Cover the PV modules.
• Switch off the fuses in the DC distribution boxes (e.g. Sunny Central String-Monitor) and
secure them against reconnection.
• Follow all safety precautions of the module manufacturer.
Normally grounded conductors may be ungrounded and energized when a ground-
fault is indicated. Risk of electric shock.
• Test before touching.
• Work on the Disconnect Unit must be carried out by qualified personnel.
36
DisconACDC_SCUS-IUS103110
SMA America, LLC
Installation Guide
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