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三相系统中最常见的短路类型是接地故障的单个导体（图1.相对地）。这是当电路中的一个导体与地球接触时。
下一个最常见的短路类型是与导体故障的相位或导体的相位（相位相位） - 当电路中的两个导体彼此接触时。
Next is a double phase or double conductor to earth fault (Fig 3. Phase-phase-to-earth) – two of the two conductors in a circuit each simultaneously come into contact with an earth.
最后，最小常见类型的短路是平衡的三相或三个导体故障（图4.三相） - 当所有三个导体与地球接触时。虽然这罕见，但它可能会发生，而设计工程师必须转到相当长的长度以防止这种事件的后果。
在所有情况下，这些故障都是短路 - 阻力最小的路径是通过故障，而不是通过您尝试电源的设备。
