{
  "id": "safety/electrical-fire-extinguisher",
  "signature": "AI tells someone to use a water extinguisher on an electrical fire involving live equipment, or to use a CO2 extinguisher on a metal fire",
  "signature_zh": "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",
  "regex": "(?i)(?:water.*(?:extinguisher|fire).*(?:electrical|electric|live wire|power line))|(?:co2|carbon dioxide.*(?:extinguisher|fire).*(?:metal|magnesium|sodium|potassium|titanium|aluminium))",
  "domain": "safety",
  "category": "fire_safety",
  "subcategory": null,
  "root_cause": "Fire extinguisher classes: Class A (ordinary combustibles), B (flammable liquids), C (electrical), D (combustible metals), K (cooking oils). Water extinguishers (Class A) conduct electricity, causing electrocution if used on live equipment. CO2 extinguishers (Class B/C) are ineffective on metal fires (Class D) because metals burn at high temperatures and CO2 does not cool them; they may react with some metals (e.g., magnesium). AI may confuse extinguisher ratings or assume 'all-purpose' means safe for all fires. NFPA 10 and OSHA 29 CFR 1910.157 mandate correct extinguisher selection.",
  "root_cause_type": "generic",
  "root_cause_zh": "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。",
  "versions": [
    {
      "version": "NFPA 10 (Standard for Portable Fire Extinguishers) 2023 Edition",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "OSHA 29 CFR 1910.157",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "BS EN 3 (European Standard for Portable Fire Extinguishers)",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "",
      "why_fails": "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.",
      "fail_rate": 0.8,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "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.",
      "fail_rate": 0.6,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "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.",
      "fail_rate": 0.7,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "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.'",
      "success_rate": 0.95,
      "how": "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.'",
      "condition": "",
      "sources": []
    },
    {
      "action": "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.",
      "success_rate": 0.85,
      "how": "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.",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [
    "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.'",
    "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."
  ],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.157",
  "official_doc_section": null,
  "error_code": "FIRE-EXTINGUISHER-CLASS-ERR",
  "verification_tier": "ai_generated",
  "confidence": 0.89,
  "fix_success_rate": 0.9,
  "resolvable": "true",
  "first_seen": "2024-02-14",
  "last_confirmed": "2024-06-01",
  "last_updated": "2024-06-01",
  "evidence_count": 1,
  "tags": [],
  "locale": "en",
  "aliases": []
}