近年来，依据核算数据显现因电气原因引发的火灾在各类火灾中高居榜首，约有３０％的火灾是由居处电气线路老化或配备不合理构成的，并正以均匀每年１％的速度持续上升。在电气火灾中，电气短路引起的火灾事端又占到一半以上。电气短路的方法有两种：一种是导体间直触摸摸，如相与相之间、相与Ｎ线之间短路，短路点往往被高温熔焊的金属短路，称为金属性短路；另一种则是带电导体对地短路，是以电弧为通路的电弧性短路（缺陷电弧）。前者短路电流以数千安计，金属线芯发生高温以致火热，
Agilestar - DWDM-XENPAK-31.90 - For Cisco - New in Box
Agilestar - DWDM-XENPAK-32.68 - For Cisco - New in Box
Agilestar - DWDM-XENPAK-34.25 - For Cisco - New in Box
Agilestar - DWDM-XENPAK-35.04 - For Cisco - New in Box
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Agilestar - DWDM-XENPAK-38.19 - For Cisco - New in Box
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Agilestar - DWDM-XENPAK-39.77 - For Cisco - New in Box
Agilestar - DWDM-XENPAK-40.56 - For Cisco - New in Box
Agilestar - DWDM-XENPAK-42.14 - For Cisco - New in Box
Agilestar - DWDM-XENPAK-42.94 - For Cisco - New in Box
Agilestar - DWDM-XENPAK-43.73 - For Cisco - New in Box
