Anything with the potential to release a hazard. Cause classes include (but are not limited to): thermal energy, chemical energy, biological energy, radiation, kinetic energy, electrical energy, climatic condition, uncertainty or human factors.

Source: International Association of Drilling Contractors, Appendix 2 to Health, Safety and Environment Case Guidelines for Offshore Drilling Contractors, Issue 3.3.2, February 2010. IADC Guidelines

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