Electrical equipment in hazardous areas the participation of operations, maintenance, safety, electrical and instrumentation professionals, the use of process diagrams and material flows, MSDS and any pertinent documents, information and knowledge to determine the hazards and their extent and the countermeasures to be employed. Area classification documentations are reviewed and updated to reflect process changes. Soon after the introduction of electric power into coal mines, it was discovered that lethal explosions could be initiated by electrical equipment such as lighting, signals, or motors. The hazard of fire damp or methane accumulation in mines was well known by the time electricity was introduced, along with the
2014 Kaohsiung gas explosions sky and flames reaching 15 stories high. The blasts ripped up roads, trapped and overturned cars and firetrucks, and caused a blackout to the electrical grid. About 6 km of road length were damaged. The explosions reportedly blew cars and motorcycles high up in the air; some vehicles and victims were found at the rooftops of buildings three or four stories high. One street had been split along its length, swallowing fire trucks and other vehicles. Premier Jiang Yi-huah stated that there had been at least five blasts around the city. The blasts cut gas supplies to 23,600 households, electricity