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The rated duration of a short circuit (t _K) depends on the network protection and is symmetrical. Over the decades of network development, this value has typical decrease, because of faster protection relay equipment. A typical value today is 1 s, but also 0.5 s can be used. In some cases, 2 s or 3 s may be required. The duration of a short circuit has a significant impact on the GIS design, and it is recommended to keep this time as short as possible (see Table 1.9).