Impedance should not be too low for desired maximum fault current.
2.
Impedance can be added after the secondaries are summed to limit maximum fault currents ( the 3 " I " o path ).
3.
IEEE 1584 provides a guide to perform these calculations given that the maximum fault current, duration of faults, and other general equipment information is known.
4.
Circuit breakers are also rated by the maximum fault current that they can interrupt; this allows use of more economical devices on systems unlikely to develop the high short-circuit current found on, for example, a large commercial building distribution system.
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