Iec 60815 Guide For The Selection And Dimensioning Of High Pdf -

| Level | Site Pollution Class (SPC) | Typical Environment | |-------|----------------|----------------------| | I | Light | Rural areas, low industrial activity. | | II | Medium | Urban zones, moderate industry, agricultural dust. | | III | Heavy | Industrial zones, high salinity coastal areas. | | IV | Very Heavy | Desert edges, chemical plants, severe sea salt deposits. |

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These are minimum values. The engineer must adjust for profile (rib geometry) and material.