SMA SC 500CP XT Installation - Manual (Page 69)

9.1.4 Requirements for Cable Routing between MV Transformer and Inverter
Risk of fire due to overheating of cables if different cable lengths are used
Cables of differing lengths may cause the cables to overheat and catch fire. This can result in death or serious injury.
• All line conductors from the inverter to the MV transformer must be of the same length.
• The cable length between the connection points must not exceed a maximum length. Maximum cable length:
15 m.
Cable and cable laying requirements:
☐ The cables must be designed for the maximum voltages to ground.
For the Sunny Central 500CP XT / 630CP XT / 720CP XT / 760CP XT / 800CP XT, the maximum voltage to
ground is: ±1,450 V.
For the Sunny Central 850CP XT / 900CP XT, the maximum voltage to ground is: ±1,600 V.
☐ The cables must be designed for the maximum root-mean-square value. Maximum root-mean-square value: 800 V.
☐ Do not attach more than four cables to each AC connecting plate.
☐ Use copper or aluminum cables only.
☐ Maximum cable cross-section: 300 mm².
☐ All line conductor cables must be of the same length and must not exceed the maximum cable length. The
maximum cable length is 15 m.
☐ The AC cables must be bundled in the three-phase system.
☐ Between the MV transformer and the inverter, three separate cable routes for the AC cables must be available,
e.g. cable channels.
☐ A line conductor L1, L2 or L3 must be laid in each cable channel. Ensure that the distance between the cable
bundles is at least twice the diameter of a cable. This will prevent current imbalances. Furthermore, it is
recommended to execute cabling between inverter and MV transformer directly on a grounding strap. This
measure further reduces electromagnetic influences.
Figure 19: Arrangement of AC cables with three cables per line conductor (example)
Position Designation
L1 Line conductor L1
L2 Line conductor L2
L3 Line conductor L3
A Grounding strap
9 Appendix SMA Solar Technology AG
Operating Manual 69 SCCPXT-IA-E4-en-44