According to the way the gov installers interpet it. If its a STAND ALONE system,it gets a grounding rod ,frame is bonded etc. If its a BACKUP system, in other words only starts and runs when commercial power fails,it uses the commercial power ground,generally installed at the meter base, and frame bonding straps are lifted. Thats how we do all of our systems anyway,and as I interpet it thats what the code book says. Just as a side note: Normal power on a system here would be commercial power,failing to generator power, failing to battery bank power. Normally two,three or more power supplies, sometimes two or more independant backup battery banks ,and often transfer switches that dont break before closing for use in brownout conditions. It can get very confusing,if you dont keep grounds all single point, and ground loops can kill you. We do of course use multipoint grounds on some systems but for the most part power systems use single point grounds. In other words you normally want all power generating systems grounded to the same point. Basically, it keeps multi powered systems from floating several volts above one another. A transformer for instance can be several thousand volts above a backup generators voltage if its not properly ground referenced. It can get very complicated, but if you use a single point as your ground reference,its much much less so.
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Today's Featured Article - Show Coverage: Argyle and Mt. Pleasant Labor Day Weekend Shows - by Cindy Ladage. The last fling before summer fades into fall and we get busy in the fields are the annual Labor Day tractor shows. Beginning on September 5th and running through the 7th, the Argyle Antique Gas and Engine Show is held at the Argyle State Park. Located in West Central Illinois, the pine forest was the setting for the opening of the 22nd show. This year we decided to try to sell a few tractor parts, literature and wrenches to offset my husband's buying sprees. Saturday
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