Trace Sun Tie ST1000, Инструкция по установке и эксплуатации

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17
2.0 INSTALLATION
©2000 Xantrex/Trace Engineering
Lightning Protection
To protect the equipment from lightning damage, a single point grounding system should be
used. 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. Ground roof mounted
solar array frames directly to the external utility ground rod (Figure 13A).
If the solar array is located a considerable distance from the ST unit, then an additional ground
rod must be installed close to the solar array for the most reliable lightning protection (Figure
13B). The grounded frame of the solar array provides a direct route to dissipate lightning strikes
via the close ground rod. Tie this ground rod to the main utility ground rod via a heavy gauge
(#8–6 AWG) bare copper wire which can be buried underground. Tieing these grounds together
constitutes a single point ground and provides the best protection from lightning damage. Refer
also to the NEC for specific grounding requirements.
ST Unit
Main Utility
Breaker Panel
Utility
Meter
Solar
Array
DC Wiring
AC Wiring
Buried Copper Wire
Array Ground Rod
Utility Ground Rod
Utility Ground
Wire
Ground
Bar
Ground
Bar
> 100 feet (30 m)
Array Ground Wire
Ground
Frame to
Pole
AC
Wiring
AC
Wiring to
Utility
975-F00-006
Bonded Neutral Wire
Figure 13B
Long Distance Grounding
ST Unit
Main Utility
Breaker Panel
Utility
Meter
DC Wiring
AC Wiring
Utility
Ground
Rod
Utility Ground
Wire
Ground
Bar
Array Ground Wire
AC
Wiring
AC
Wiring to
Utility
Solar
Array
957-F00-007
Bonded Neutral Wire
Ground
Bar
Figure 13A
Typical Roof Mount Installation Grounding