Definition(s)
Spaces, Enclosed
Spaces delineated by floors, bulkheads and decks, which may have doors or windows. (IMO—MODU Code 1.3.33.
API RP 500, Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Division 1 and Division 2, Third Edition, December 2012, Global Standards