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    "PF must be in (0, 1] — PF=0 → POWER_FACTOR_OUT_OF_RANGE (not a soft zero)",
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    {
      "title": "IEC 60050 — International Electrotechnical Vocabulary",
      "section": "Apparent power (IEV 131-11-41)",
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      "published": "2025-05-16",
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      "url": "https://www.bipm.org/en/publications/si-brochure",
      "supports": "W and VA unit relationships",
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      "published": "2026-06",
      "doi": "https://doi.org/10.59161/AUEZ1291"
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      "title": "NIST Guide to the SI (SP 811)",
      "section": "Watt and volt-ampere",
      "url": "https://www.nist.gov/pml/special-publication-811",
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