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2. Safety Precautions
2.1 Appropriate Usage
This series inverter is designed and tested in accordance with international safety requirements.
However, certain safety precautions must be taken into account when installing and operating this
inverter. The installer must read and follow all instructions, cautions and warnings in this installation
manual.
All operations including transport, installation, start-up and maintenance, must be carried out
by qualified, trained personnel.
The electrical installation & maintenance of the inverter shall be conducted by a licensed
electrician and shall comply with local wiring rules and regulations.
Before installation, check the unit to ensure it is free of any transport or handling damage,
which could affect insulation integrity or safety clearances. Choose the installation location carefully
and adhere to specified cooling requirements. Unauthorized removal of necessary protections,
improper use, incorrect installation and operation may lead to serious safety and shock hazards or
equipment damage.
Before connecting the inverter to the power distribution grid, contact the local power
distribution grid company to get appropriate approvals. This connection must be made only by
qualified technical personnel.
Do not install the equipment in adverse environmental conditions such as in close proximity to
flammable or explosive substances; in a corrosive environment; where there is exposure to extreme
high or low temperatures; or where humidity is high.
Do not use the equipment when the safety devices do not work or are disabled.
Use personal protective equipment, including gloves and eye protection during the installation.
Inform the manufacturer about non-standard installation conditions.
Do not use the equipment if any operating anomalies are found. Avoid temporary repairs.
All repairs should be carried out using only approved spare parts, which must be installed in
accordance with their intended use and by a licensed contractor or authorized FOXESS service
representative.
Any time the inverter has been disconnected from the public network, please be extremely
cautious as some components can retain charge sufficient to create a shock hazard. Prior to
touching any part of the inverter please ensure surfaces and equipment are under touch safe
temperatures and voltage potentials before proceeding.
2.2 PE Connection and Leakage Current
All FOXESS inverters incorporate a certified internal RCD (Residual Current Device) to protect
against possible electrocution in case of a malfunction of the PV array, cables or inverter (DC). The
RCD in the FOXESS inverter can detect leakage on the DC side. The RCD limit is set to 30mA, and
the RCD must be must be type B and not type A or AC RCD (IEC 60755). There are 2 trip thresholds
for the RCD as required by NB/T32004-2018. A low threshold is used to protect against rapid
changes in leakage typical of direct contact by people. A higher threshold is used for slowly rising
leakage currents, to limit the current in grounding conductors for the safety. The default value for
higher speed personal protection is 30mA, 60mA, and 150mA per unit, and 1A per unit for lower
speed fire safety.
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