Princeton GTIB-30, Installation Manual

Page: 45 / 69

GTIB-30 Installation Manual-UL
4411-0011, Rev 2.0 45
4.7 Earth Wiring
It is essential that the GTIB-30 is connected to protective earth ground of the premises.
The GTIB-30 provides a special terminal for this connection (see Figure 20). Once
this terminal is earthed, the internal wiring of the GTIB-30 will ensure that all parts
of the enclosure and other touchable metal parts are properly shorted to the protective
earth ground.
It is the responsibility of the installer to ensure that all grounding arrangements
are NEC compliant before proceeding with the installation. PPS takes no
responsibility for damage or injuries resulting from non NEC compliant
grounding arrangements.
4.7.1 AC Circuit and DC Port earth wire requirements
For the AC circuits and the Battery configuration, a ground wire will be sized at least
according to Table 7, based on the size of the over-current device protecting that
circuit. Voltage and temperature requirements of Section 4.5.1 must also be
considered.
The ground wire for the PV input will be rated for at least 1.25 times the rated short-
circuit current of the installed PV array.
Table 7: Ground Wire Size Chart
Column 1 Column 2
Minimum size of equipment grounding or
bonding conductor
AWG or kcmil (mm)
Maximum current
rating in Amperes
Copper Aluminum or copper-
clad aluminum
15 14 (2.1) 12 (3.3)
20 12 (3.3) 10 (5.3)
30 10 (5.3) 8 (8.4)
40 10 (5.3) 8 (8.4)
60 10 (5.3) 8 (8.4)
90 8 (8.4) 6 (13.3)
100 8 (8.4) 6 (13.3)
150 6 (13.3) 4 (21.2)