{
  "ref_no": "UL 9540A:2026",
  "slug": "ul-9540a",
  "title": "Test method for evaluating thermal runaway fire propagation in battery energy storage systems",
  "status": "版本更新",
  "effective_on": "2026-03-13",
  "scope": "Cell, module, unit and installation level testing",
  "key_requirements": "A test method standard, not a certification scheme; data supports fire and installation approvals",
  "languages": [
    "EN"
  ],
  "market": {
    "iso": "US",
    "name": "United States"
  },
  "events": [
    {
      "on": "2026-03-13",
      "note": "Sixth edition published",
      "source_url": "https://www.shopulstandards.com/ProductDetail.aspx?productId=UL9540A"
    },
    {
      "on": "2019-11-12",
      "note": "Fourth edition published",
      "source_url": "https://www.shopulstandards.com/ProductDetail.aspx?productId=UL9540A"
    }
  ],
  "source_url": "https://www.shopulstandards.com/ProductDetail.aspx?productId=UL9540A",
  "verified_at": "2026-08-19",
  "version": 1,
  "urls": {
    "html": "/en/regulations/ul-9540a",
    "markdown": "/en/regulations/ul-9540a.md"
  }
}