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9. Line cable and protection devices
Load protection breaker (AC disconnect switch) and line cable sizing
To protect the inverter and the AC connection line, a device must be installed to protect against maximum current and leakage to ground, with the following
characteristics:
Type
Nominal Voltage
Nominal Current
Magnetic protection characteristic
Number of poles
Type of differential protection
Differential sensitivity
In case of installation of a residual current protection device must meet the following characteristics:
Number of poles
Type of differential protection
Differential sensitivity
ABB declares that the ABB transformerless inverters, in terms of their construction, do not inject continuous ground fault currents and therefore there is no
requirement that the differential protection installed downstream of the inverter be type B in accordance with IEC 60755 / A 2.
Characteristics and sizing of the line cable
To connect the inverter to the grid you need 4 connections: ground, neutral, phase and external grounding protection In any case, connection of the inverter
to ground is mandatory.
The connection of the grid cable to the inverter is realised through the dedicated AC output connector
• Characteristics and sizing of the line cable
• Installation of the cable on the AC output connector counterpart
• Connection of the AC output connector to the inverter
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 point.
In order to allow installation of the grid cable inside the AC output connector
The table shows the maximum line conductor length in relation to the section of the conductor itself:
Cross-section of the line conductor (mm²)
1.5
2.5
4
6
The values are calculated in nominal power conditions, taking into account:
1. a power loss of not more than 1% along the line.
2. copper cable, with HEPR rubber insulation, laid in free air
10. Output connection (AC)
To avoid risks of electrical shock, all wiring operations must be carried out with the disconnect switch downstream of the inverter
(grid side) opened and applying LOTO procedure on it.
Installation of the cable on the AC output connector:
• Remove the head of the connector by pressing on the two
holding clips and subsequently loosen the cable gland.
1
• Prepare the cable respecting the following measurements. It's
possible to use both stranded or solid wire but the requirements are
different.
The use of stranded wire with a conductor section va-
lues between 1.5 - 4 mm² are only allowed with the
mandatory use of properly crimped ferrules.
REACT2-UNO-3.6
Automatic circuit breaker with thermal-magnetic protection
25 A
REACT2-UNO-3.6
20
, the sizings indicated in the figure must be observed.
Maximum length of the line conductor (mt)
REACT2-UNO-3.6
5 m
10 m
16 m
24 m
1
• Feed the cable through the connector and cut the cable to size.
Ensure that the cable's radius of curvature is more
than 4 times the diameter of the cable
2
X
Y
- 13 -
230 Vac
B/C
2
A/AC
300 mA
2
A/AC
300 mA
17
by carrying out the following operations:
REACT2-UNO-5.0
-
6 m
10 m
16 m
2
Y
30mm
L,N 25 mm
N
L
Max 6 mm²
Ø10÷14mm
REACT2-UNO-5.0
32 A
REACT2-UNO-5.0
max. 6 mm²
N
L
Ø10÷14mm
2a
2b
X
12mm with ferrules*
8mm without ferrules*
z:
z
10mm max
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