MJC: The sources of these internal transients are everyday items, such as air compressors, arc welders, pumps, elevators, switching power supplies and other inductive loads.

• 这些内部电涌的根源是每天都会使用的设备，如空气压缩机，电弧焊接机，泵，电梯，开关电源和其他的感应负载。