FoxESS T6 - Surge protection devices (SPDs) for PV installation

T Series User Manual www.fox-ess.com P a g e | 4
- Make sure that grounding conductor is adequately sized as required by safety regulations.
- Do not connect the ground terminals of the unit in series in case of a multiple installation. This product
can cause current with a DC component, where a residual current operated protective device (RCD) or
monitoring device (RCM) is used for protection in case of direct or indirect contact, only an RCD or RCM
of type B is allowed on the supply side of this product.
For UK
- The installation that connects the equipment to the supply terminals shall comply with the requirements
of BS 7671.
- Electrical installation of PV system shall comply with requirements of BS 7671 and IEC 60634-7-712.
- No protection settings can be altered.
- User shall ensure that the equipment is so installed, designed and operated to maintain at all times
compliance with requirements of ESQCR22(1)(a).
For AU
Electrical installation and maintenance shall be conducted by licensed electrician and shall comply with
Australia National Wiring Rules.
2.3 Surge protection devices (SPDs) for PV installation
Lightning will cause damage either from a direct strike or from surges due to a nearby strike.
Induced surges are the most likely cause of lightning damage in majority or installations, especially in rural
areas where electricity is usually provided by long overhead lines. Surges may impact on both the PV array
conduction and the AC cables leading to the building. Specialists in lightning protection should be consulted
during the end use application. Using appropriate external lightning protection, the effect of a direct lightning
strike into a building can be mitigated in a controlled way, and the lightning current can be discharged into the
ground.
Thanks to the integrated SPD on DC and AC side, it is not necessary to install external lightning protection
system on both sides. The inside integrated SPD device is SPD type 2 protection, if the voltage protection level
(VP) of the surge arresters is greater than 1100V, an additional SPD type 3 is required for surge protection for
electrical devices.