Installation

L1

240 VAC

L2

Ground bar

 

Figure 2-11 240 VAC connection points

Grounding the System

PV grounding

The Sun Tie XR is designed to have all PV positive, negative and ground

 

conductors connected inside its access area. The PV equipment ground

 

should be connected to the Sun Tie XR ground bar. This ground bar must

 

also be connected to the main utility breaker panel’s ground bar and to the

 

house grounding rod according to the NEC requirements. Verify that there

is an AC ground/neutral bond in the main utility breaker panel and that no other ground/neutral bonds exist in the system.

Lightning protection

To protect the equipment from lightning damage, use a single-point grounding system. In this system, all ground lines terminate at the same point. This point normally is the main utility ground installed by the utility company to provide a ground for the house wiring. This ground usually consists of a copper rod driven 6 to 8 feet into the earth, as shown in Figure 2-12.

Recommended

Xantrex recommends that if the inverter is more than 8 feet from the

additional

utility ground rod, a second ground rod should be added (Reference NEC

grounding

250.56) and bonded to the same point (Reference NEC 250.58) to

 

minimize the impedance to ground and maximize system protection.

2–18

975-0053-01-01