Definition(s)
Protection, Special
An IEC protection technique other than those that have been standardized. This type of protection is referred to by IEC 60079-0 as “s.”.
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