ISA 12.20.01 : 2009(R2014)

1 Purpose
2 Scope
3 References
4 Definitions
5 General requirements
6 Construction and testing requirements
   6.1 General
   6.2 Power sources
   6.3 Ignition control unit
   6.4 Primary wires
   6.5 Ignition coils
   6.6 Secondary leads
   6.7 Spark plugs
7 Spark containment
   7.1 General
   7.2 Secondary leads
   7.3 Spark plugs
   7.4 Terminations
8 Spark prevent
   8.1 General
   8.2 Terminations
   9 Spark detection/prevention
10 Documentation and marking
11 Test procedures
   11.1 Abrasion test for secondary leads or wiring
   11.2 Elevated temperature exposure test
   11.3 Chemical compatibility
   11.4 Vibration test
   11.5 Shielded secondary system tests
   11.6 Spark plug pressure and temperature tests
   11.7 Secondary lead assembly flashover tests
   11.8 Secondary lead UV degradation tests
   11.9 Secondary lead bending and dielectric voltage
         withstand tests
   11.10 Spark prevention test
   11.11 Primary and secondary terminations pull test
   11.12 Spark plug dielectric test
   11.13 Secondary lead or wiring insulation cut test
   11.14 Surface temperature test
   11.15 Impact test
   11.16 Secondary lead pull test

General Requirements for Electrical Ignition Systems for Internal Combustion Engines in Class I, Division 2 or Zone 2, Hazardous (Classified) Locations, sets essential requirements for electrical ignition systems used in spark-ignited internal combustion engines operating in hazardous locations classified as Class I, Division 2 or Zone 2. This standard emphasizes safety by detailing how these systems should be designed, built and tested to prevent sparks, arcs or heat that could ignite flammable atmospheres. It covers components such as ignition coils, secondary leads, spark plugs and control units, specifying tests for durability under conditions like abrasion, temperature extremes, chemical exposure, vibration and impact. It also includes marking and documentation requirements to help with the proper installation and maintenance of ignition systems in potentially explosive environments.