Definition(s)
Intrinsic safety ground bus
A grounding system that has a dedicated conductor separate from the power system so that ground currents will not normally flow and that is reliably connected to a grounding electrode. (For further information, refer to Article 504 of NEC and ISA RP 12.6.01.)
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
Source: API RP 14F, Design, Installation, and Maintenance of Electrical Systems for Fixed and Floating Offshore Petroleum Facilities for Unclassified and Class 1, Division 1 and Division 2 Locations, Fifth Edition, July 2008. Global Standards