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UL 1449: Key Changes From 2nd Edition to 3rd Edition

UL 1449: Key Changes From 2nd Edition to 3rd Edition

Key concepts:

  • UL 1449, 3rd Edition became effective on Sept. 29, 2009
  • Key changes included:
    • Restructuring of some requirements
    • Nomenclature change and type designations added
    • Measured limiting voltage (MLV) – 2nd Edition
    • Voltage protection rating (VPR) – 3rd Edition
    • Nominal discharge current test added
    • Surge arrestors rolled into 3rd Edition

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