Fire Investigation
V型/倒锥型炭化痕迹的顶点通常指向起火点,是判断起火点位置最重要的痕迹之一
炭化最深处通常为起火点,沿火势蔓延方向逐渐变浅
导线熔痕(短路熔珠)、金属构件异常变色、配电箱/插座附近起火
一次短路熔珠(火灾前短路)vs 二次短路熔珠(火灾中短路)须金相分析区分
多个独立起火点、助燃剂残留、异常猛烈燃烧、门窗被故意打开助燃
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Char depth survey | ~2.5 cm per 30 min on wood | NFPA 921 |
| V-pattern tracing | V-pattern points to origin | NFPA 921 §18 |
| Lowest burn | Lowest char = origin zone | Fire investigation practice |
| Fall direction | Objects fall away from origin | NFPA 921 §18 |
| Ignition time | Empirical cooling-based back-calc | SFPE Handbook |
| Evidence chain | Physical/witness/CCTV triangulation | Fire investigation protocol |
根据火场痕迹(V型痕、炭化梯度、烟熏等)和起火原因线索,辅助分析起火点位置与起火原因,生成调查清单。