| FM Approved Transformers
FM Approved Transformers are Code Listed and Labeled to Bring Power to the Load
The "FM Approved and Code Listed" Transformer is the first listed and labeled liquid-filled transformer. Factory
Mutual Research Corporation's Class 3990 Transformer Approval Standard makes it easy for
specifiers of indoor and outdoor transformers to comply and verify compliance with the National
Electrical Code®.
FM Approved and Code Listed Transformers integrate state-of-the-art fire safety design
and construction that in most cases eliminates the need for fire vaults, auto sprinklers
or special clearances. *NEC and FM listing requirements are simplified, FM Loss Prevention
Data Sheet compliance is easier and installation flexibility is increased. In addition,
with the FM Approved logo clearly visible on the transformer, third party certification
of NEC compliance is now readily verifiable by the local inspector.
FM Approved and Code Listed Transformers are available as substation, pad-mounted and overhead transformers, three-phase and single-phase, with ratings from 5-10,000 kVA and voltage ratings up to 46 kV. R-Tran Transformers are filled with R-Temp fire-resistant dielectric coolant, which for decades has provided flawless fire safety.
For applications with severe harmonic levels, specify the R-Tran K-Plus™ Transformer. This line of transformers is capable of withstanding constant and severe harmonic levels of varying degrees, based on the optimal K factor rating selected. For added fire safety, R-Tran K-Plus Transformers can be specified "FM Approved and Code Listed".
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FM Approved Brochure
Listed Transformers, Are They All the Same?
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