The National Electrical Manufacturers Association (NEMA) published
TR 1-2013 Transformers, Regulators and Reactors.
This publication applies to single-phase and polyphase power and distribution transformers (including step-voltage regulators and reactors). Step-voltage regulators have been added to the scope in this edition and there is now more alignment with IEEE transformer standards. NEMA TR 1 is one of the few standards on the market that lists audible sound levels for these particular transformers.
TR 1-2013 may be downloaded at no cost or purchased in hardcopy for $55 on the NEMA website.
NEMA is the association of electrical equipment and medical imaging manufacturers, founded in 1926 and headquartered in Rosslyn, Virginia. Its 400-plus member companies manufacture a diverse set of products including power transmission and distribution equipment, lighting systems, factory automation and control systems, and medical diagnostic imaging systems. Total U.S. shipments for electroindustry products exceeds $100 billion annually.
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