37
EN-US
Cross section of
AC wires
Minimum cross section of AC wires (for an ambient temperature of 122 °F / 50 °C):
480 V Delta: 277
WYE
Neutral conduc-
tor sizing
When the inverter is connected to a 480 V Delta: 277 V AC WYE grid, the neutral conductor
is used as an active conductor.
Safety Only an authorized electrician is permitted to connect this inverter to the public grid.
WARNING! An electric shock can be fatal. Inadequately sized electrical compo-
nents can cause serious injuries to persons and damage to (or loss of) property.
- All electrical installations must be carried out in accordance with the National
Electrical Code, ANSI/NFPA 70, and any other codes and regulations appli-
cable to the installation site.
- For installations in Canada, the installations must be done in accordance with
applicable Canadian standards.
- Use minimum AWG 14 to maximum AWG 4, min. 167°F (75°C), copper wire
for all AC wiring connections to the Fronius IG Plus.
- Use only solid or stranded wire. Do not use fine stranded wire.
Fronius IG Plus AC wire
208 V
AC wire
240 V
AC wire
277 V
V 3.0-1 AWG 12 AWG 14 AWG 14
V 3.8-1 AWG 12 AWG 12 AWG 12
V 5.0-1 AWG 8 AWG 10 AWG 12
V 6.0-1 AWG 8 AWG 8 AWG 10
V 7.5-1 AWG 6 AWG 6 AWG 8
V 10.0-1 AWG 4 AWG 4 AWG 6
V 10.0-3 AWG 8 AWG 8 -
V 11.4-1 AWG 4 AWG 4 AWG 4
V 11.4-3 AWG 8 AWG 8 -
V 12.0-3 - - AWG 12
NOTE! Voltage drop and other considerations may dictate larger size wires be
used.
NOTE! An inadequately sized neutral conductor can affect the inverter feeding
energy into the grid.
The neutral conductor must be the same size as the other current-carrying con-
ductors L1, L2 and L3.
WARNING! An electric shock can be fatal. Danger from grid voltage and DC volt-
age from solar modules.
- The connection area should only be opened by a licensed electrician.
- The separate power stage set area should only be disconnected from the
connection area after first being disconnected from the grid power.
Never work with live wires! Prior to all connection work, make sure that the AC
and DC wires are not charged.