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* Transformers with natural ventilation
**Transformers with forced ventilation
| admissible noise levels | KVA* | KVA** |
|---|---|---|
| 48 | 0-50 | — |
| 51 | 51-100 | — |
| 55 | 101-300 | — |
| 56 | 301-500 | — |
| 57 | 700 | — |
| 58 | 1000 | — |
| 60 | 1500 | — |
| 61 | 2000 | — |
| 62 | 2500 | — |
| 63 | 3000 | — |
| 64 | 4000 | — |
| 65 | 5000 | — |
| 66 | 6000 | — |
| 67 | 7500 | 6250 AND LESS |
| 68 | 10000 | 7500 |
| 69 | — | 9375 |
| 70 | — | 10000 |
The data included in the tables are based on the Colombian technical standard NTC 5978.
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