SMA SSM-U-1615 - Manual (Page 28)

4. Release the screw on the connecting terminal plate, insert the grounding cable and fasten the
screw (torque: 3.2 Nm).
5. Ensure that the grounding cable is securely fixed.
6. Attach the grounding cable to the strain relief in the DC subdistribution using a cable tie.
7. Ground the grounding cable in the vicinity of the DC subdistribution, e.g. by means of a
grounding electrode.
6.3 Installation of the DC Main Cables
6.3.1 Safety during Installation of the DC Main Cables
Risk of fire due to failure to observe torque specifications on voltage-carrying bolted
connections
Failure to follow the specified torques reduces the transmission capacity of live bolted connections
and the contact resistances increase. This can cause components to overheat and catch fire.
• Ensure that live bolted connections are always tightened with the exact torque specified in
this document.
• When working on the device, use suitable tools only.
• Avoid repeated tightening of live bolted connections, as this may result in inadmissibly high
torques.
Damage to the electronic assembly by the DC main cables
When inserting the DC main cables into the DC subdistribution, it is possible to damage the
electronic assembly.
• When inserting the DC main cables, keep them far enough away from the electronic
assembly.
Failure of data transmission due to incorrect cable routing
Non-compliance with the minimum clearances between the DC main cables and the data cable
may lead to failure of data transmission. This can result in yield loss.
• When laying the DC main cables, ensure that the minimum clearance of 200 mm to the data
cables is observed.
6.3.2 Options for Installation of the DC Main Cables
You can regularly connect up to two DC main cables per pole. The required material for the bolted
connections is already preassembled on the busbar. Further material may be required depending
on the connection type and the cable type.
The following options for connecting the DC main cables are available:
6 Installation SMA Solar Technology AG
Operating Manual SSMUXX15-BE-en-10 28