Fronius Symo Advanced Installation Instruction page 29

Connection Diagram & Connection Area
DC = (+)
Ungrounded solar modules
PV frame ground
Cu / Al Cu
Cu: min. AWG 14 - max. AWG 6
Al : AWG 6
DC = (-)
N
L1
L2
L3
Example
Fronius Symo
DC = terminal block
MPPT1
MPPT2
DC = disconnect
Grounding terminal
Grounding electrode terminal
Energy-
meter
AC ~ distribution
panel
Main grounding system
DC = (+)
L3
L2
L1
N
Lockable AC ~
disconnect
switch
DC = (-) AC ~
29