5 Electrical connection
20
5.1 General electrical connection procedure of
NTX inverter
The DC input from the PV arrays and the output to
the AC utility grid connect to the inverter inside the
NTX inverter case. AC, DC and COM knockouts are
provided on the bottom of the NTX inverter.
± DC1
± DC2
AC GRID
COM
OFF
ON
1
5
2
3
4
1
OFF
ON
2 ±DC1 (DC knockouts-water tight plug size: M32)
3 ±DC2 (DC knockouts-water tight plug size: M32)
4 AC GRID (DC knockouts-water tight plug size:
M32)
5 COM (Communication knockouts-water tight
plug size: M20)
WARNING
The AC and DC knockouts are sized for 1 in. con-
duits, and the communication knockouts are sized
for 1/2 in. rigid conduits. Do not enlarge the knock-
out holes because this will result ingress of water
and damage to the inverter.
2
1
4
3
1 1/2 in. conduit
2 1/2 in. conduit fitting
3 1 in. conduit
4 1 in. conduit fitting
WARNING
In order to tighten correctly the screw terminal of
the inverter, Pin Definition applied, AWG size, tem-
perature and torque listed in the following tables.
The restrictions on minimum AWG value are due
to cable gland. The resteictions on maximum AWG
value are due to National Electric Code (ANSI/NFPA
70).
