A Coordination Study maximizes power system selectivity by isolating faults to the nearest protective device, as well as helping to avoid nuisance operations that are due to transformer inrush or motor starting operations.
The NEC addresses the importance of this type of study in articles 110-9, 110-10, 240, and 517.17. It is clear that a third party, independent study performed during/after the equipment submittal process, can prove to be invaluable
