[Selection of fuse and cables]
Mains cable (AC line cable) shall be short circuit protected and thermal overload
protected.
Always fit the input cable with fuses. Normal gG (US: CC or T) fuses will protect the
input cable in short circuit situations. They will also prevent damage to adjoining
equipment.
Dimension the fuses according to local safety regulations, appropriate input voltage
and the rated current of the solar inverter.
AC output protected by external fuse (gG, rated current 16 A/ 250 VAC), provided in
all live connections to the AC supply.
The rated short circuit breaking capacity of the above protective device shall be at
least equal to the prospective fault current at the point of installation. See section
technical data of this manual for details.
AC output cables: Cu, (L,N+PE, 2x2,5+2,5mm
2
with a max length of 2m and operating
time of the fuse is less than 5 seconds, installation method B2 according to EN
60204-1: 2006, annex D: cable in conduit cable trucking system, number of loaded
circuit only one. Use 90 °C wire for ambient temperature between 40 °C and 65 °C.
NOTE
For conditions differing from those mentioned above, dimension the
cables according to local safety regulations, appropriate input
voltage and the load current of the unit. (You can choose a thicker
cable but the fuses must be rated according to the table.)
NOTE
Fuses must be approved by notified body.
Inverter is provided galvanic isolation from the MAINS to the PV
array, back feed current to the array is not considered. However, DC
side current is about 20,4A and decrease to 0A within 20.4ms under
the PV input short circuit condition. Therefore, the current-carrying
capacity of the components and sub-assemblies provided in the
end-use system (connectors, cables, junction box, switchgear, etc.)
and the reverse current PV module shall be considered based on
back feed current and reverse current. The direct current (DC) circuit
breaker or fuse between each solar generator and inverter shall be
provided based on solar inverter input ratings.
Select DC cables based on the above inverter back feed current and
Isc PV rating and Vmax ratings.
To Next Page
Loading...