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
Lakshmi Mittal government said it wanted to renegotiate the 2004 sale to ArcelorMittal. Employees of Mittal have accused him of "slave labour" conditions after multiple fatalities in his mines. During December 2004, twenty-three miners died in explosions in his mines in Kazakhstan caused by faulty gas detectors. In 2002 Plaid Cymru MP Adam Price obtained a letter written by Tony Blair to the Romanian Government in support of Mittal's LNM steel company, which was in the process of bidding to buy Romania's state-owned steel industry. This revelation caused controversy, because Mittal had given £125,000 to the British Labour Party the previous year.