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
Gas gangrene as a degree of loud and distinctive crepitus caused by gas escaping the necrotic tissue. Gas gangrene is caused by exotoxin-producing "Clostridium" species (most often "C. perfringens", and "C. novyi", but less commonly "C. septicum" or "C. ramnosum"), which are mostly found in soil, but also found as normal gut flora, and other anaerobes (e.g., "Bacteroides" and anaerobic streptococci). The exotoxin is commonly found in "C. perfringens" type A strain and is known as alpha toxin. This alpha toxin is a lethal toxin and also known as phospholipase C (lecithinase). It increases vascular permeability and produces necrotizing activity. These environmental