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Planning
Ground Requirements
System Neutral Requirements
Inverter Isolation Transformer
2–4
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 GT100 Enclosure to ensure compliance with
FCC Part 15, Class A. 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).
The GT100 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.
The GT100 includes a custom, high-efficiency, isolation transformer. The utility
side windings of the isolation transformer are configured Wye and must match the
voltage at the utility inter-tie. The GT100 is a balanced, three-phase, current-
sourcing inverter and only operates with the presence of a stable utility voltage.
The transformer is supplied with a neutral connection on both the Primary and
Secondary windings. Connection of these neutral terminals will affect the
operation of the GT100 and must be left floating or disconnected. Single-phase,
grounded loads which may be present between the transformer and utility, will
maintain their existing ground reference at the utility distribution transformer.
CAUTION: Equipment Damage
If the Isolation Transformer neutral (H0 and X0) terminals are tied to ground, they may
cause irreparable damage to the GT100. Check local regulations for their requirements
regarding the connection of these neutrals.
This manual for use by qualified installers only
153379
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