Full definition
Formal document that authorizes the performance of a specific hazardous task at a specific time and place. Types: hot work (welding, grinding), confined space, electrical (high voltage), work at heights (>1.8 m), excavations. Contains: work description, identified hazards, required precautions, PPE, responsible parties and validity period. Requires signature from requester, executor and safety coordinator. Internationally recognized system in petrochemical, mining and energy sectors. Standards: OSHA 29 CFR 1910.147, ISO 45001.