Typical Zone 2 areas (IS 5572) ? (Secondary grade)
- The system handling flammable liquid or vapour is in an adequately ventilated area and is so designed and operated that the explosive or ignitable liquids, Vapours or gases will normally be confined within closed containers or closed systems from which they can escape only during abnormal conditions such as accidental release of a gasket or packing
- The flammable vapours can be conducted to the location as through trenches, pipes or ducts
- Locations adjacent to Zone 1 areas
- Pressurized rooms where flammable gas / vapour can enter in the case of failure of positive mechanical ventilation