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GFCI's can be used successfully to reduce electrical hazards on <br /> construction sites. Tripping of GFCI ' s, interruption of current <br /> flow, is sometimes caused by wet connectors and tools. It is <br /> good practice to limit exposure of connectors and tools to <br /> excessive moisture by using watertight or sealable connectors. <br /> Providing more GFCI 's on shorter circuits can prevent tripping <br /> caused by--the cumulative leakage from several tools or by <br /> leakages from extremely long circuits. (Adapted from OSHA 3007 ; <br /> Ground-Fault Protection on Construction Sites-1987) . <br /> Fire Prevention <br /> During equipment operation, periodic vapor-concentration <br /> measurements should be taken with an explosimeter or <br /> combustimeter. If at any time the vapor concentrations exceed <br /> 20% of LEL, the Site Safety Officer, or designated field worker, <br /> should immediately shut down all operations. <br /> Only_, approved metal can will be used to transport and store <br /> flammable liquids. <br /> All gasoline and diesel-driven engines requiring refueling must <br /> be shut down and allowed to cool before filling. <br /> Smoking is not allowed during any operations within the work area <br /> is which petroleum products or solvents in free-floating, <br /> dissolved or vapor forms, or other flammable liquids may be <br /> present. <br /> No open flame or spark is allowed in any area containing <br /> petroleum products, or other flammable liquids. <br /> General Health <br /> Medicine and alcohol and increase the effects of exposure to <br /> toxic chemicals. Unless specifically approved by a qualified <br /> physician, prescription drugs should not be taken by personnel <br /> assigned or operations where the potential for absorption, <br /> inhalation, or ingestion or toxic substances exists. <br /> Drinking and riving is prohibited at any time. Driving at <br /> excessive speeds is always prohibited. <br /> Skin abrasions must be thoroughly protected to prevent chemicals <br /> from penetrating the abrasion. <br /> It is recommended that contact lenses not worn by persons working <br /> on the site. <br /> 26 <br />