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
Vertical damp proof barrier Vertical damp proof barrier The purpose of a Vertical Damp Proof Barrier is to prevent the ingress of damp and water into subterranean structures such as basements, cellars, tunnels and earth shielded buildings. (Also known as Earth sheltered buildings). Traditionally, this took the form of several coats of bitumous paint or tar. This, though cheap, has the disadvantage that any movement in the structure or joints is likely to rupture the paint so allowing water to enter. Modern solutions take the form of a plastic membrane, often pre-coated with adhesive and a "peel off" paper that is applied to the