8
Safety
All DC cables shall be installed in a distance as short as possible, and the positive and
negative cables of the same input need to be bundled together to avoid causing loops in
the system. Minimum distance installation and binding requirements also apply to auxiliary
grounding and shielding grounding conductors.
Anti-islanding Effect
The islanding effect means that when the power grid is cut off, the grid-connected power
generation system fails to detect the power outage and still supplies power to the power
grid. This is very dangerous for the maintenance personnel and the power grid on the
transmission line. The inverter’s use active frequency offset method to prevent islanding
effect.
PE Connection and Leakage Current
All inverter’s incorporate a certified internal Residual Current Monitoring (RCM) in order to
protect against possible electrocution and fire hazard in case of a malfunction in the PV
array, cables or inverter. There are 2 trip thresholds for the RCM as required for certification
(IEC 62109-2:2011).
The default value for electrocution protection is 30mA, and for slow rising current
is 300mA. the house loads. If an external RCD is required by local regulations, it is
recommended to choose a Type-A RCD with the rating residual current of 300 mA.
DANGER!
• High leakage current!
• Earth connection essential before connecting supply.
A faulty ground connection can result in equipment failure, personal and death injuries,
and electromagnetic interference. Ensure correct according to grounding to IEC62109 and
conductor diameter according to STANDARD specification. Do not connect the grounding
end of the equipment in series to prevent multi-point grounding. Electrical appliances
must be installed in accordance with the wiring rules of each country.
For United Kingdom
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 60364-7-712. All protective devices cannot be changed.
User shall ensure that equipment is so installed, designed and operated to maintain at all
times compliance with the requirements of ESQCR22(1)(a).
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