ISA 12.00.01-2005

Electrical Apparatus for Use in Class I, Zones 0, 1 & 2 Hazardous (Classified) Locations: General Requirements (IEC 60079-0 Mod)
standard by The International Society of Automation, 08/15/2005

ISA 62443-2-4-2018

Security for industrial automation and control systems, Part 2-4: Security program requirements for IACS service providers (IEC 62443-2-4:2015+AMD1:2017 CSV, IDT)
standard by The International Society of Automation, 07/13/2018