Installation manual

Installation
3–10 153396 Revision D
This manual is for use by qualified installers only
Grounding
System Grounding This product is intended to be installed as part of a permanently grounded
electrical system per the National Electrical Code ANSI/NFPA 70, as well as all
state and local code requirements. A copper clad earth grounding electrode must
be installed within 1 m (3 ft.) of the Xantrex GT250 enclosure. This is to be the
single point earth ground for the inverter system. The single point connection to
the earth grounding electrode for the inverter system is to be made at the AC
ground bus bar (TB2).
Chassis Ground The chassis ground is a copper bus bar (TB2) in the AC interface and has six bolts
for terminating the grounding electrode conductor. Per the National Electrical
Code ANSI/NFPA 70, the grounding electrode conductor size depends on the size
of the largest ungrounded service-entrance conductor used.
The equipment ground on the Xantrex GT250 is marked with
System Neutral
The Xantrex GT250 is designed to be installed as a four-wire system. As required
by the UL 1741 listing, a neutral conductor from the utility-interconnect must be
terminated at TB1-N within the AC interface to ensure that the AC voltage sensing
circuit can perform an individual phase voltage (line-to-neutral) measurement. The
function of the neutral connection is to provide a point of reference for
measurement purposes that is essentially at ground potential. No power will flow
through the neutral conductor.
Figure 3-7 Single-point Ground; Ground Bar
Ground Bar (TB2) to
be used for the Single
Point Ground