Grounding Requirements - Xantrex GT2.5-NA Owner's Manual

Installation

Grounding Requirements

AC Grounding
North America
Elsewhere
PV Grounding
Long Distance Grounding
2–8
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WARNING: Shock hazard
The GT Inverter must be grounded by connection to a grounded permanent wiring system.
The GT Inverter must be connected to a grounded, permanent wiring system via
the GT Inverter ground bar. See Figure 2-2 for the location of the GT Inverter
ground bar.
The ground bar must also be connected to the main utility breaker panel ground
bar and to the house grounding rod according to NEC requirements.
In other locations, AC grounding is governed by local codes. Consult with the
local utility for specific grounding requirements.
The GT Inverter is designed to have all PV positive, negative, and ground
conductors connected inside its wiring box. The PV equipment ground should be
connected to the GT Inverter ground bar.
The size for the conductor is usually based on the size of the largest conductor in
the DC system.
A DC grounding electrode conductor may be required by the Authority Having
Jurisdiction (AHJ). Use the GT Inverter ground bar for this connection.
Important:
In most models, the negative PV conductor is internally bonded to the
ground system within the inverter's ground fault detection circuit. Inverter models marked
with the "-POS" suffix are positive grounded and have the positive PV conductor
internally bonded to the ground system through the inverter's ground fault protection
circuit. It is important that the negative (or positive) PV conductor is not bonded to the
ground at any other point in the system.
If the PV array is more than 30 meters (100 feet) from the inverter, then there
must also be a direct connection from the array frame to an earth ground next to
the array. A connection between this ground and the primary earth ground
connection via a buried wire between the two points is also necessary (see
Figure 2-3).
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