INSTALLATION AND WIRING
44
c) The safety earth should be as thick as possible, minimum thickness as stated in below table.
d) The earthing point should be as close to the inverter as possible, and the wire as short as possible.
e) The RFI earth should be a braided strap with a 10mm
2
minimum cross sectional area, and as short as
possible.
f) The earths should be as far away from input and output cables (particularly to equipment sensitive to
RFI) as possible, and any distance where they are parallel should be kept to a minimum.
g) Design in RFI prevention before installation.
(Unit: mm
2
)
Earth Wire Size
Motor Size
400V Class
3.7kW or less 2
5.5kW, 7.5kW 3.5
11kW to 15kW 8
18.5kW to 37kW 14
45kW, 55kW 22
2
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