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Safety
x
153378
Wiring Requirements
1. 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.
•
Use copper conductors with an insulation rating of 90°C.
•
If installed, the optional Fused Combiner (GTFC) requires the use of copper
conductors with a maximum insulation rating of 75°C.
2. The GT100 has a three-phase, four-wire output.
3. The GT100 is interfaced with the AC utility grid at TB1 (TB1-A, TB1-B, TB1-C
and TB1-N), located in the lower left side of the enclosure. These terminals
require the use of a UL-approved crimp-on type ring terminal or a UL-approved
compression-type lug certified for use with the chosen interface cables. Keep
these cables together as much as possible and ensure that all cables pass through
the same knockout and conduit fittings, allowing any inductive currents to
cancel. For torque values, see Table A-5 on page A–5. See Figure 1-3 on page 5
for the location of these terminals.
4. The AC neutral terminals (H0 and X0), shall be left floating (not connected) on
both the utility and inverter sides of the isolation transformer.
See page xii for details.
5. The GT100 is interfaced with the DC photovoltaic array at either the Fused
Combiner (GTFC) or TB3, as well as TB4 and TB5 (PV GND), located in the
lower right side of the enclosure. Do not connect the grounded power conductor
from the PV array directly to TB5 (PV GND); doing so will bypass the ground
fault detector and violate the NEC.
6. The TB3, TB4, and TB5 terminals require the use of a UL-approved crimp-on
type ring lug or a UL-approved compression-type lug certified for use with the
chosen interface cables. The Fused Combiner assembly includes box style
connectors for cable termination. Keep these cables together as much as possible
and ensure that all cables pass through the same knockout and conduit fittings,
allowing any inductive currents to cancel. For acceptable torque values for the
box style connectors and the TB3, TB4, and TB5 terminals, see Table A-6 and
Table A-7 on page A–5. See Figure 1-5 on page 1–8, Figure 1-6 on page 1–9,
Table 1-1 on page 1–8, and Table 1-2 on page 1–9 for the location and polarity of
these terminals.
7. This product is intended to be installed as part of a permanently grounded
electrical system as 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 3 ft. (1 m) of the GT100 enclosure to ensure compliance
with FCC Part 15, Class A.. The AC ground bus bar (TB2), located in the lower
left side of the GT100 enclosure, must be used as the single point connection to
the earth grounding electrode for the inverter system.
Summary of Contents for GT100-208
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