Princeton GTIB-30, Installation Manual

Page: 46 / 69

GTIB-30 Installation Manual-UL
46 4411-0011, Rev 2.0
4.7.2 Grounding in Grid-Tied configuration
If a grid is available on the premises, a protective earth connection must also already
be available on the premises. The grounding arrangements of the premises must be
checked for NEC compliance by qualified personnel before continuing with the
installation. Note that it is generally not permissible to have separate earth
connections on the same premises that are not electrically connected. Therefore,
generally if a utility grid is available on the premises, the earth connection of that
connection must be used.
4.7.3 Connecting to the Grounding terminal
Connect the GTIB-30 to the protective earth connection by feeding a (green or
green/yellow marked) earth wire with the AC wires. Connect it to the earth terminal
as shown in Figure 24. (Refer to Section
4.7.1 AC Circuit and DC Port earth wire
requirements
for ground cable size requirements).
The earth wire must be insulated to prevent it from touching any of the exposed
power terminals or the transformer.
WARNING:
If the GFDI option is installed, the battery is negative-grounded to the
chassis. See Section 4.11.1 for more information.
Figure 24: Main earth terminals inside enclosure with earth wire connected.
4.8 Torque Specifications of Power Terminal Blocks
All power wiring is done using the terminal blocks shown in Figures 21, 22, and 23.
The AC terminal blocks can accommodate 18-6 AWG wire. The DC terminal block
can accommodate 14-2 AWG. The Earth Ground terminal blocks can accommodate
14-4 AWG. Earth Ground wire should be sized in accordance with Section 4.7.1.
During the installation, the terminal block clamps should be tightened according to
the wire size being inserted. For 2/0 to 6AWG Copper or Aluminum wire torque
clamping screw to 120 inch lbs, for 8AWG Copper wire torque clamping screw to 40
inch lbs, and for 10-14AWG Copper wire torque clamping screw to 35 inch lbs.
Earth Ground
Terminal Blocks