{
  "name": "UL 1973:2022 (Ed. 3) clause-level changes by subject area",
  "description": "Clause-level additions and revisions to ANSI/CAN/UL 1973:2022 listed in a laboratory standards update notice, compiled with the clause number, whether it is a construction, test or marking requirement, and the key condition stated.",
  "page": "https://casrai.org/guides/ul-1973",
  "publisher": "CASRAI",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "dateModified": "2026-11-14T12:30:04Z",
  "temporalCoverage": "2022/2024",
  "spatialCoverage": null,
  "columns": [
    {
      "name": "Subject",
      "unit": "",
      "description": ""
    },
    {
      "name": "Clause",
      "unit": "",
      "description": ""
    },
    {
      "name": "Requirement type",
      "unit": "",
      "description": ""
    },
    {
      "name": "Key stated condition",
      "unit": "",
      "description": ""
    }
  ],
  "rows": [
    {
      "Subject": "Module short circuit test",
      "Clause": "17.3",
      "Requirement type": "Test",
      "Key stated condition": "Also run on field-replaceable modules; shorting device max 20 mΩ"
    },
    {
      "Subject": "System safety analysis",
      "Clause": "7.8.1, 7.8.3",
      "Requirement type": "Construction",
      "Key stated condition": "Hazard identification, risk analysis, risk evaluation; considers over/under-voltage, over/under-temperature, over-current and single faults"
    },
    {
      "Subject": "Protective circuits and controls",
      "Clause": "7.9",
      "Requirement type": "Construction",
      "Key stated condition": "Active protective devices not relied upon for critical safety unless one of three listed conditions is met"
    },
    {
      "Subject": "Transformer evaluation",
      "Clause": "7.7, 26.6",
      "Requirement type": "Construction/Test",
      "Key stated condition": "UL 1562, UL 1310 or equivalent; low-voltage (60 Vdc or less) transformer evaluation"
    },
    {
      "Subject": "High Rate Charge",
      "Clause": "16",
      "Requirement type": "Test",
      "Key stated condition": "Protection against charging above maximum charging current specification"
    },
    {
      "Subject": "Overload Under Discharge",
      "Clause": "18",
      "Requirement type": "Test",
      "Key stated condition": "Fully charged unit with parallel-connected cells or modules"
    },
    {
      "Subject": "Electromagnetic immunity",
      "Clause": "27",
      "Requirement type": "Test",
      "Key stated condition": "Applies to BMS and other active protective devices relied upon as primary safety protection"
    },
    {
      "Subject": "External Fire Exposure for Projectile Hazards",
      "Clause": "41",
      "Requirement type": "Test",
      "Key stated condition": "20-minute test; hose stream 38 mm nozzle, 30 degrees, 517 kPa, min 4.7 L/s"
    },
    {
      "Subject": "Flowing electrolyte leak detection",
      "Clause": "7.11.8",
      "Requirement type": "Construction",
      "Key stated condition": "Leak detection means that initiates mitigating controls"
    },
    {
      "Subject": "Sodium-ion cell requirements",
      "Clause": "7.12.10",
      "Requirement type": "Construction",
      "Key stated condition": "Annex E and cell marking 44.15, 44.16"
    },
    {
      "Subject": "Repurposed cells and batteries",
      "Clause": "7.13.1, 44.3",
      "Requirement type": "Construction/Marking",
      "Key stated condition": "UL 1974 process; Repurposed or Second Life marking"
    }
  ],
  "sources": [
    {
      "title": "Intertek Standards Update Notice, UL 1973 (ANSI/CAN/UL 1973:2022 Ed.3)",
      "url": "https://cdn.intertek.com/www-intertek-com/dms-legacy/UL-1973-SUN-Rev-2-25-2022-ED-2-25-2024.pdf",
      "accessed": "2026-11-14"
    }
  ]
}