26 REFUsol 40K / 46K-MV REFU Elektronik GmbH
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. 10: Grounding bolt
Pos: 39 /Inverter M anuals/Insta llation/FI-Sc hutz/WR @ 1\mod_140480 5598809_641 .docx @ 6857 @ 2 @ 1
4.9
Residual Current Protection
Pos: 40 /Inverter M anuals/Insta llation/Netzans chluss/840 842 @ 1\m od_1404805699 538_641.docx @ 6863 @ 2 @ 1
4.10
AC Grid 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.
M8 grounding bolt
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