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Three-phase transformers auto refrigerated
| KVA | Average noise level (dB) | Average noise level (dB) |
| Open | Encapsulated | |
| 0-9 | 40 | 45 |
| 10-50 | 45 | 50 |
| 51-150 | 50 | 55 |
| 151-300 | 55 | 57 |
| 301-500 | 60 | 59 |
| 501-700 | 62 | 61 |
| 701-1 000 | 64 | 63 |
| 1 001-1 500 | 65 | 64 |
| 1 501-2 000 | 66 | 65 |
| 2 001-3 000 | 68 | 66 |
| 3 001-4 000 | 70 | 68 |
| 4 001-5 000 | 71 | 69 |
| 5 001-6 000 | 72 | 70 |
| 6 001-7 500 | 75 | 71 |
| 7 501-10 000 | 79 | 72 |
Open three-phase transformers refrigerated forced air
| KVA | Average noise level (dB) |
| 0-1167 | 67 |
| 1 168-1 667 | 68 |
| 1 668-2 000 | 69 |
| 2 001-3 333 | 71 |
| 3 334-5 000 | 73 |
| 5 001-6 667 | 73 |
| 6 668- 8 333 | 75 |
| 8 334-10 000 | 78 |
Single-phase transformers self- refrigerated
| KVA | Nivel de ruido promedio (dB) | Nivel de ruido promedio (dB) |
| Abiertos | Encapsulados | |
| 0-50 | 50 | 50 |
| 51-167 | 55 | 55 |
| 168-333 | 60 | 60 |
| 500 | 64 | 63 |
| 833 | 65 | 64 |
| 1 256 | 68 | 66 |
| 1 667 | 70 | 68 |
| 2 500 | 71 | 70 |
| 3 333 | 72 | 71 |
| 5 000 | 73 | 72 |
| 10 000 | 79 | 72 |
| KVA | Nivel de ruido promedio (dB) |
| 0-50 | 67 |
| 51-167 | 67 |
| 168-333 | 67 |
| 500 | 67 |
| 833 | 68 |
| 1 256 | 70 |
| 1 667 | 71 |
| 2 500 | 72 |
| 3 333 | 74 |
| 5 000 | 76 |
| 10 000 | 78 |
The data included in the tables are based on the Colombian technical standard NTC 5978.
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