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About This Item

 

Full Description

This standard states FM Approval criteria for transformers insulated with less or nonflammable liquids
 

Document History

  1. FM Approvals 3990


    Liquid-Insulated Transformers

    • Most Recent
  2. FM Approvals 3990:2021


    Liquid-Insulated Transformers

    • Historical Version
  3. FM Approvals 3990


    Less or Nonflammable Liquid-Insulated Transformers

    • Historical Version
  4. FM Approvals 3990

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    Less or Nonflammable Liquid-Insulated Transformers

    • Historical Version