Power One AURORA MICRO-0.25-I-OUTD-US-208/240, Manual, Page: 43 / 78

Page
42
of
76 MICRO-0.25/0.3-I-OUTD-US-208/240 BCG.00612_AB
Part
3 Mounting and Wiring
3.4 CONNECTION TO THE AC DISTRIBUTION GRID (AC SIDE)
To prevent electrical hazards, all the connection operations must be carried
out with the disconnect switch downstream of the inverter (grid side) open
and locked.
When connecting to the grid, all the Power-One AC
cables coming from MICRO inverters must be joined
inside a junction box.
A single line cable must then form the connection to
the distribution grid.
Be particularly mindful of the dimensions of the line
cable. The grounding connection from the inverters
is obligatory
.
The AC cable used is quadrupole
All the external connections to the insulated junction box (caps, adapters, etc.)
must be made with securely-sealed Power-One components.
3.4.1 C
HARACTERISTICS AND
S
IZING OF THE
L
INE
C
ABLE
The line cable (not supplied from Power-One) runs between the junction box and the load
distribution panel.
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. If the impedance is too high, it causes an increase in the AC
voltage that, on reaching the limit set by the country of installation, causes the inverter to switch
OFF.
The installation technician is responsible for selecting a cable of the appropriate
length and cross section. In case of any doubt as to dimensions, refer to the
technical characteristics in the Appendix.