Installation manual

Wiring - General Requirements
153396 Revision D 3–9
This manual is for use by qualified installers only
Overcurrent Protection
Unless provided as part of the Schneider Electric supplied equipment, the AC
overcurrent protection for the utility interconnect (Grid-tie) wiring and equipment
must be provided by the installer as part of the Xantrex GT250 installation.
Conductor Termination
The Xantrex GT250 has terminals and bus bars for making all wiring connections
required for the installation. All AC and DC terminal connections allow for the use
of copper conductors with an insulation rating of 90 °C (194 °F).
• For bolt size and torque values for the AC terminals, see Table A-6.
• For bolt size and torque values for the DC terminals, see Table A-7.
All wiring methods and materials shall be in accordance with the National
Electrical Code ANSI/NFPA 70, as well as all state and local code requirements.
AC Interface The AC line terminals in the AC interface (TB1-A, TB1-B, TB1-C, and TB1-N) have
one bolt per bus and a maximum of two cables per bolt. These terminals require
the use of crimp-on type ring-terminals or compression lugs.
See Figure 3-8 on page 3–12 for the location of these terminals.
The system/chassis ground terminal in the AC interface (TB2-Ground) is six bolts
per pole and a maximum of two cables per bolt. These terminals require the use of
crimp-on type ring terminals or compression-type lugs.
See Figure 3-8 on page 3–12 for the location of this terminal.
The auxiliary control interface terminals are one wire per terminal (TB7-3, and
TB7-4). These terminals require the use of crimp-on type ring-terminals or
compression lugs.
See Figure 3-9 on page 3–12 for the location of these terminals.
DC Interface The DC terminals in the DC interface [TB3, TB4, and TB5 (PV GND)] have seven
bolts per pole and a maximum of two cables per bolt. These terminals require the
use of crimp-on type ring-terminals or compression lugs.
See Figure 3-10 on page 3–13 for the location of these terminals.
WARNING: Risk of fire
In accordance with the National Electrical Code, ANSI/NFPA 70, connect only to
a circuit provided with the following maximum branch circuit overcurrent
protection:
• Xantrex GT250 480 and Xantrex GT250 480 PG – 400 A
• Xantrex GT250 600 – 350 A
Important: Keep these cables together as much as possible, and ensure that all
cables pass through the same knockout and conduit fittings, thus allowing any
inductive currents to cancel.