Audible Sound Levels
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All transformers have a slight hum, or buzz when operating, but certain regulations are in place to ensure they are built to operate as quietly as practically possible.
Below are the latest NEMA TR-1 Average decibel ratings as of 2020. Maddox Industrial Transformer liquid-filled padmount, polemount and substation transformers are built to the latest NEMA, IEEE, ANSI standards, and Department of Energy regulations. Call us if you have any questions: 1-800-270-2011 |
Self-Cooled, Two Winding kVA Rating |
Average Decibels (dB) |
45-500 |
56 |
501-700 |
57 |
701-1000 |
58 |
1001-1500 |
60 |
1501-2000 |
61 |
2001-2500 |
62 |
2501-3000 |
63 |
3001-4000 |
64 |
4001-5000 |
65 |
5001-6000 |
66 |
6001-7500 |
67 |
7501-10000 |
68 |