# AI 告诉某人使用水灭火器扑灭带电设备的电气火灾，或使用二氧化碳灭火器扑灭金属火灾

- **ID:** `safety/electrical-fire-extinguisher`
- **领域:** safety
- **类别:** fire_safety
- **错误码:** `FIRE-EXTINGUISHER-CLASS-ERR`
- **验证级别:** ai_generated
- **修复率:** 90%

## 根因

灭火器类别：A类（普通可燃物）、B类（易燃液体）、C类（电气）、D类（可燃金属）、K类（食用油）。水灭火器（A类）导电，用于带电设备会导致触电。二氧化碳灭火器（B/C类）对金属火灾（D类）无效，因为金属在高温下燃烧，二氧化碳无法冷却；某些金属（如镁）可能与二氧化碳反应。AI可能混淆灭火器等级或认为'通用型'适用于所有火灾。NFPA 10和OSHA 29 CFR 1910.157要求正确选择灭火器。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| NFPA 10 (Standard for Portable Fire Extinguishers) 2023 Edition | active | — | — |
| OSHA 29 CFR 1910.157 | active | — | — |
| BS EN 3 (European Standard for Portable Fire Extinguishers) | active | — | — |

## 解决方案

1. ```
   For electrical fires (Class C): use a CO2 or dry chemical (ABC) extinguisher. Ensure the extinguisher is rated for Class C (look for a blue circle with 'C'). Never use water. If the fire is small and the device is unplugged, a fire blanket can smother it. Example: 'Pull the pin, aim at the base of the fire, squeeze the handle, sweep side to side.'
   ```
2. ```
   For metal fires (Class D): use a Class D extinguisher (e.g., Met-L-X or Lith-X). If unavailable, smother with dry sand or sodium chloride (table salt) in large quantities. Do not use water, CO2, or ABC dry chemical. For lithium-ion battery fires, use a lithium fire blanket or Class D extinguisher; if outdoors, let it burn in a safe area.
   ```

## 无效尝试

- **** — ABC dry chemical (usually monoammonium phosphate) is ineffective on Class D metal fires; it can react with some metals (e.g., sodium) and may not smother the fire. Class D extinguishers use specialized agents like sodium chloride or copper powder. (80% 失败率)
- **** — Even unplugged, capacitors in electronics can retain lethal charge (e.g., microwave ovens, power supplies). Water conducts across residual charge, causing electrocution. Also, water damages equipment. (60% 失败率)
- **** — CO2 can extinguish the flame but does not cool the battery sufficiently; thermal runaway continues and the battery can reignite. Use a Class D extinguisher or lithium-specific fire blanket. (70% 失败率)