22 REFUsol 08K ... 23K REFU Elektronik GmbH
• Ethernet interface port
• Power connection
4.8
Grounding
DANGER
Danger to life from electric shock
The inverter must be earthed with the grounding bolt, otherwise a potential
difference can build up, causing a risk of electric shock!
The inverter features a
threaded bolt below the power supply port on the connection side for additional
grounding. Grounding is intended to comply with the EMC requirements and to ensure optimum overvoltage
protection. The ground wire cross-section must be bigger than the cross-section of the power supply line. In
addition, ensure that the ground wire is placed as far away from and not directly in parallel to the power
supply line.
The maximum permissible torque for this screw is 10 Nm / 7 ft lbs.
Fig. 9: Grounding bolt
4.9
Residual Current Protection
4.10
Power Connection
DANGER
Risk of electric shock and fire caused by high discharge current
Before connecting the device to the supply circuit, establish a ground -
connection by means of the labelled ground stud!
Note:
The photovoltaic power supply inverters without transformers meet the fault
protection requirements according to IEC 60364-7-712 and CEI 64-8/7 can be
operated with a type A residual-current circuit breaker.
The rated leakage current should be at least 300 mA per inverter.
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