SCOPE AND FIELD OF APPLICATION Application of the information contained herein should lead to improved safety practices. This information may also be used to evaluate existing installations and procedures and@ as necessary@ to improve their effectiveness. Furthermore@ when the narrow limits within understood fore investigators may be encouraged to search more diligently for the true ignition sources in instances where ignition by static electricity is unlikely or impossible. To prevent fires@ whatever their cause@ it is necessary to control one or more of the three elements are fuel (in vapor form or mist)@ air and a source of ignition. Significant sources of electrical ignition are sparks from static electricity@ lightning strokes@ sparks from induced charges which may accompany lightning and arcs caused by breading of circuits involving stray currents. Control procedures relate to the prevention of the arc or spark itself@ or to the prevention of a flammable vapor-air mixture where such discharges cannot be prevented.