Cross section of
the AC cable
When using an M32 metric screw joint (reducer removed):
Cable diameter 11 - 21 mm
(with a cable diameter of 11 mm the strain-relief force is reduced from 100 N to
a maximum of 80 N)
With cable diameters greater than 21 mm, the M32 screw joint must be replaced
by an M32 screw joint with a larger clamping area - item number: 42,0407,0780 –
strain-relief device M32x1.5 clamping area 18–25.
Connecting the
inverter to the
public grid (AC)
Note!
-
Form loops with the AC cables when connecting them to the AC terminals.
-
When securing the AC cables using a metric screw joint, ensure that the
loops do not protrude beyond the connection area.
Otherwise, under certain circumstances it may no longer be possible to close the
inverter.
Note!
-
Make sure that the grid's neutral conductor is grounded. This may not be the
case for IT grids (insulated grids with no earthing); it will then not be possible
to use the inverter.
-
The neutral conductor must be connected in order to operate the inverter. A
neutral conductor that is too small may adversely affect the inverter feeding
energy into the grid. The neutral conductor must have an amperage of at
least 1 A.
IMPORTANT! The PE ground conductor of the AC cable must be laid in such a
way that it is the last to be disconnected in the event that the strain-relief device
should fail.
This can be ensured, for example, by making it somewhat longer and by laying it
in a loop.
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Fronius Symo
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