Installation manual

Installation
3–8 153396 Revision D
This manual is for use by qualified installers only
Wiring - General Requirements
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.
When sizing conductors and conduits interfacing to the Xantrex GT250, both
shall be in accordance with the National Electrical Code ANSI/NFPA 70, as well
as all state and local code requirements.
The model Xantrex GT250 has a three-phase, four-wire output.
Conductor size should have been pre-determined when the conduit was
installed. Prepare the appropriate length conductors for each connection.
WARNING: Risk of electric shock, explosion, and arc flash
• The Xantrex GT250 enclosure contains exposed high voltage conductors.
• The enclosure doors should remain closed with the latches tightened, except
during installation, maintenance or testing.
• These instructions are for use by qualified personnel, as defined in “About
This Manual”, who meet all local and governmental code requirements for
licensing and training for the installation of Electrical Power Systems with AC
and DC voltage to 600 volts.
• To reduce the risk of electric shock, do not perform any servicing other than
that specified in the installation instructions unless you are qualified to do so.
• Do not open the cabinet doors if extreme moisture is present (rain or heavy dew).
WARNING: Risk of electric shock, explosion, and arc flash
In order to remove all sources of voltage from the Xantrex GT250, the incoming
power must be de-energized at the source. This may be done at the main utility
circuit breaker, the PV array disconnect, and by opening the AC disconnect and
the DC disconnect switch on the Xantrex GT250. Follow the “Lock-out and Tag-
out (De-energize/Isolation Procedure)” on page xiii to de-energize the Xantrex
GT250 and test all circuits to verify that the inverter is fully de-energized, before
servicing or maintenance. Opening the AC and DC disconnect switches on the
inverter does not remove all power from the inverter. Review the system
configuration to determine all of the possible sources of energy. In addition, allow
five minutes for the DC bus capacitors to discharge after removing power.
CAUTION: AC phase convention
When connecting external AC wires to the Xantrex GT250, positive phasing
sequence should be maintained throughout the installation process. Refer to the
system schematics in the unit enclosure for proper phasing convention. The
Xantrex GT250 includes the ability to auto-sense and correct for a mis-phased
connection at the AC interface terminals. In the event the power conductors from
the utility are not phased correctly at the AC interface terminals, the Xantrex GT250
will sense the discrepancy and automatically correct for a clockwise (A-B-C)
phase rotation.