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
1995 Daegu gas explosions At the ceremony, about 500 people including family members and citizens attended the ceremony and prayed for the victims' souls. 1995 Daegu gas explosions The 1995 Daegu gas explosions was a gas explosion that occurred at Daegu Metro Line 1, a construction site located in Sangin-dong, Daegu, South Korea, on 28 April 1995. At least 101 people, including 42 Yeoungnam Middle School students were killed with as many as 202 people injured. The event occurred on April 28th, 1995 at 7:52 am in the underground construction site of the 2nd Section of the Sagley Subway Line 2 at Nam High