Characteristics and sizing of the line cable
The cross-section of the AC line conductor must be sized in order to
prevent unwanted disconnections of the inverter from the grid due to high
impedance of the line that connects the inverter to the power supply; If
the impedance is too high it causes an increase in the AC voltage which,
on reaching the limit set by the standards in the country of installation,
causes the inverter to switch off.
The table shows the maximum line conductor length in relation to the
section of the conductor itself:
Line conductor cross section (
2
mm) Line conductor maximum length (m)
TRIO-50.0-TL-OUTD
25 33 m
35 46 m
50 66 m
70 92 m
95 122 m
The values are calculated in nominal power conditions, considering:
- loss of power along the line no greater than 1%
- use of copper cable, with HEPR rubber insulation and positioned in open air.
Load protection switch (AC disconnect switch)
To protect the AC connection line of the inverter, an overcurrent protection
device with the following features must be installed:
TRIO-50.0-TL-OUTD
Type Automatic circuit breaker with differential thermal-magnetic protection
Voltage/current rating 100 A / 400 V
Magnetic protection characteristic B/C
Number of poles 3/4
In case of installation of a residual current protection device must meet
the following characteristics:
TRIO-50.0-TL-OUTD
Type A / AC
Sensibility 500mA
27 ÷ 35 mm
max 70 mm
(-S/-SX)
2
max 95 mm
(Standard)
2
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