Pollution Level of Insulators
23-09-2022
| Pollution Level | Specific Creeepage Distance | |
|---|---|---|
| Very Light | 12.7 mm/kV | 0.500 inch/kV |
| Light | 16 mm/kV | 0.630 inch/kV |
| Medium | 20 mm/kV | 0.787 inch/kV |
| Heavy | 25 mm/kV | 0.984 inch/kV |
| Very Heavy | 31 mm/kV | 1.220 inch/kV |
Light Pollution Level
- Areas without industry and with low housing density equipped with heating plants.
- Areas with low density of industry or houses but subjected to frequent winds and/or rainfall.
- Agricultural areas.
- Mountainous areas.
Medium Pollution Level
- Industrial areas not producing particulate polluting smoke and/or with average housing density equipped with heating plants.
- Areas with high density of houses and/or industry but subjected to frequent winds and/or rainfall.
- Areas exposed to wind from the sea but not too close to the coast (at least several kilometers distant).
Heavy Pollution Level
- Areas with high density of industries and suburbs of large cities with high density of heating plants producing pollution.
- Areas close to the sea in any case exposed to relatively strong winds from the sea.
Very Heavy Pollution Level
- Areas generally of moderate extent, subjected to conductive dusts and to industrial smoke producing particularly thick conductive deposits.
- Areas generally of moderate extent, very close to the coast and exposed to sea-spray or to very strong and polluting winds from the sea.
- Desert areas, characterized by no rain for long periods, exposed to strong winds carrying sand and salt, and subjected to regular condensation.