REFU Elektronik GmbH
REFUsol 48K-UL
27
Inverter earthing connection
DC Connection for Solar Generator (DC+, DC-)
AC Grid Connection (L1, L2, L3, N, PE)
Pos : 38 /I nverter M anuals/ Ins tall atio n/ Erdung/842 @ 3\ mod_1478694993071_641.doc x @ 25404 @ 2 @ 1
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 at the left bottom side for additional grounding. Grounding is intended
to ensure optimum overvoltage protection. The cross section for the ground must be 16 mm² (AWG 5) for
copper and 25 mm² (AWG 3) for aluminum. Depending on the function and use of the additional ground wire
other wire sizes may be required depending on the local regulation.
The maximum permissible torque for the grounding screw is 10 Nm (7 ft lbs).
Fig. 11: Grounding bolt
Pos : 39 /I nverter M anuals/ Ins tall ation/ FI-Sc hutz/ WR UL @ 2\ mod_1470147447938_641. doc x @ 23697 @ 2 @ 1
4.9
Residual Current Protection
This inverter is equipped with a Residual Current Detection (RCD) circuit to protect PV source and output
circuits against ground faults, in accordance with the 2014 National Electrical Code, article 690.35 (C).
An operational isolation error occurs when the device detects a residual current in the circuit, and is
indicated on the display of the inverter. In the event of an isolation error, please check the system isolation. If
the isolation impedance is in the normal range, please contact REFU Elektronik GmbH Service at
Note:
This photovoltaic inverters meets the fault protection requirements
according to the 2014 U.S. National Electrical Code ® section 690.35 C.
M8 grounding bolt
