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Wiring the Inverter
Wiring Requirements
AC Circuit Breaker Requirements
DC/AC Disconnect Switch
3–4
WARNING: Shock hazard
Check for existing electrical or plumbing prior to drilling holes in the walls.
Use wire size #12 to #6 AWG, copper conductors only, rated 90 °C minimum.
Strip all wires 9 mm (3/8 inch) and torque to a maximum 16 in-lb (1.8 Nm).
For safety and compliance with the NEC, run AC, DC, and communication wires
in separate conduits.
WARNING: Fire hazard
Wiring should not be undersized. Wire sizes must be coordinated with the array maximum
short circuit current or the AC breaker sizes used. Ensure wiring is in accordance with the
NEC or applicable codes.
The main utility service panel must dedicate a double pole breaker to operate each
GT Inverter installed. This breaker must be sized to handle the rated maximum
output voltage and current of the GT Inverter (see "Electrical Specifications",
"Output" on page A–2).
The wiring box includes a 600 volt PV/Utility disconnect switch that switches
both AC and DC at the same time.
Depending on the installation, an external AC and/or DC disconnect may be
required if the inverter is installed in a location not easily accessible to utility or
fire personnel. Consult local authorities for additional information.
Important:
For GT5.0 models only: the DC terminal block has six inputs for
connecting up to three PV strings. In accordance with applicable codes, if the array
consists of more than two strings, external fusing may be required to prevent conductor
overloads.
975-0334-01-01
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