Installing Cables of a PV Plant
(ch) There are particular requirements for the cables of a PV plant. They are generally not protected at the PV array, which means that the cable protection can only be provided by short circuit and ground fault protected installation, which is allowed within power generation systems according to DIN VDE 0100 Part 430. The usage of single-core sheathed cables with sufficient insulation resistance meets these requirements. However, it is essential to ensure that the cables for the plus and minus poles are laid as close together as possible to prevent the creation of induction loops.
Otherwise, in case of a close-by lightning strike, the highly variable magnetic fields could induce high voltages which are all the higher, the greater the area of the induction loop.
If a short circuit and ground fault protected installation is not possible, you must secure the DC cables as close to the PV array as possible.
All work on the inverter and the cabling of the PV array must be carried out by an electrically qualified person. SMA accepts no liability for the information and solutions given in the Online Service Center. Additional information can be found in our Online Service Center’s terms and conditions of use.