Preparing for the Installation
975-0131-01-01 2–13
Preparing for the In stallation
Ensure your local utility is consulted for any requirements for connecting to or
returning power to the grid. Obtain all permits necessary to complete the
installation. Consult your local/national electrical code for more information.
This section includes the following topics:
•“Wiring ” on page 2–13
•“Circuit Breakers and Disconnect Switch” on page 2–13
•“Other Materials Needed” on page 2–14
•“Equipment Needed” on page 2–14.

Wiring

Wire size and length will be determined by the location of each component and
their relative distance to each other. W ir e sizes may al so be affe cted by whether or
not conduit is used.
Recommended wire
stripping length Strip all wires 9mm (3/8 inch).
Acceptable wire
sizes The AC and DC terminal bl ocks in the GT Inverter accept wire si zes from
#14 AWG to #6 AWG.
Wiring should be sized such that the maximum voltage drop at full power from
the PV array to the inverter is 2% or less.

Circuit Breakers and Disconnect Switch

The following circuit breakers, disconnect switch and fuse are required for
installing this equipment.

AC Circuit Breaker Requirements

In North America, the main utility service panel must dedicate a double pole
breaker (240 volts AC) to operate each GT Inverter installed. The GT Inverter
requires a 20-Amp breaker.
Important:
In this manual “wiring” and “wires” are used in reference to both AC and
DC wiring/cabling and wires/cables.
Important:
Wiring should not be undersized. Undersizing of wiring can result in
significant power losses and reduction in system efficiency.