FM Approvals 3990
- Less or Nonflammable Liquid-Insulated Transformers
- standard by FM Approvals, 12/01/2022
- Category: FM Approvals
$50.00
$25.00
FM Approvals 3990 sets performance requirements for liquid insulated distribution and power transformers, both naturally cooled and transformers utilizing forcibly circulated cooling medium. The standard limits Approval for the naturally cooled transformers rated from 5 to 10,000 kVA and 35 kV class or lower.
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