Definition(s)
Sheltered (or Obstructed Open Area)
Area within or adjoining an open area, which may include a partially open building or structure, where owing to obstruction natural ventilation may be less than in a true open area, and this may enlarge the extent of the hazard zone.
Source: IEC 61892-7, Mobile and fixed offshore units – Electrical installations – Part 7: Hazardous areas. Global Standards