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 - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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