Definition(s)
Device, Sealed
A device so constructed that it cannot be opened during normal operational conditions or operational maintenance and is sealed to restrict entry of an external atmosphere. Such devices may be incorporated into equipment having the type of protection referred to as “nC.
Source: API Recommended Practice 14FZ, Recommended Practice for Design, Installation, and Maintenance of Electrical Systems for Fixed and Floating Offshore Petroleum Facilities for Unclassified and Class I, Zone 0, Zone 1, and Zone 2 Locations, Second Edition, May 2013. Global Standards