Which rooms are classified as damp under the Russian Electrical Installation Rules (PUE)?

Question

Which rooms are classified as damp under the Russian Electrical Installation Rules (PUE)?

Answer choices

1. Rooms where relative humidity does not exceed 60%.
2. Rooms where relative humidity exceeds 75%.
3. Rooms where relative humidity does not exceed 90%.
4. Rooms where relative humidity is close to 100%.

Answer

Option 2: relative humidity above 75%.

Explanation

PUE clause 1.1.8 defines this category by humidity above 75%. For comparison, dry rooms have humidity up to 60%; moderately damp rooms have humidity above 60% and up to 75%. Especially damp rooms form a separate category, with humidity approaching 100%.

The correct choice in this test is option 2.