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
Lighting in libraries were too unstable; open flamed lighting was just too risky because of the fire implications. Books could not be near open flames, since one accident could destroy the whole building, and its collection. There was gaslight technology available, though, before electricity came around. It created light in dark spaces, but it was not a stable source. The issue of carbon dioxide poisoning, since its light was fed by natural gas to keep it running, was a huge problem. The issue of intoxication by gas, and the instability of the gas (which could result in explosions), led to the popularization of