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C
haracteristics and sizing of the AC cable
The minimum required cross sectional area for the phases conductors is 50 mm².
The AC connection busbars
the correct coupling with the copper bars must be guaranteed by using appropriate bi-metallic
cable lug.
L
oad protection switch (AC disconnect switch)
Type
Voltage/current rating
Magnetic protection
characteristic
Number of poles
(*): please consider thermal and other derating when selecting the current rating of the protection equipment for your application.
The cross-section of the AC line conductor cables 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.
22 - 32 mm
The AC cables must be connected to the AC connection busbar
a cable lug (not supplied) of a suitable size for installation on the M10
threaded studs used for securing the cable.
The AC output cable lugs must meet the following dimensions:
a = 10.5 mm (min) b = 40 mm (max)
are in copper tin-plated; therefore if aluminum cables are used,
22
To protect the AC connection line of the inverter, an overcurrent
protection device with the following features must be installed (these are
the caracteristic of a load protection switch referred to a single inverter
installation):
Automatic circuit breaker
with thermal-magnetic protection
800 V / 150 A (*)
Magnetic curve B/C
3
- 70 -
37 - 53 mm
PVS-175-TL
Fuses switch disconnector
800 V / 200 A (*)
gG, gS
5 - Installation
using
22
3
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