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* In trenches four (4) feet deep or more , provide safe <br /> access within 25 feet of any work area. 1540(g) (2) <br /> * Install crossings with standard guard-rails and toeboards <br /> when the excavation is more than 7- 1 /2 feet deep . <br /> 1540(h) (2) <br /> * Do not excavate beneath the level of adjacent <br /> foundations , retaining walls , or other structures until a <br /> qualified person has determined that the work will not be <br /> hazardous . Support undermined sidewalks . 1540( j ) ( 1 ) , <br /> ( 2) <br /> * Shore, brace, or underpin structures when their stability <br /> is threatened . Inspect the structures daily . 1540( j ) ( 3) <br /> * Erect barriers around excavations in remote work <br /> locations . Cover all wells , pits , shafts , and cassions . <br /> Backfill temporary wells , pits , and shafts when work is <br /> completed . 1540(m) ( 1 ) (A) , (B) <br /> * Use additional bracing when vibration or external loads <br /> are a hazard . 1540(o) <br /> * Use standard shoring, sloping, and benching (See CSO 1541 <br /> and 1937 for specific requirements ) , or shore according <br /> to plans prepared by a civil engineer registered in <br /> California. 1541 <br /> Shafts : <br /> Retain all wells and shafts over five (5) feet deep which <br /> workers are required to enter with lagging , spilling , or <br /> casing. 1542(a) ( 1 ) <br /> Earthwork and excavating : <br /> Install a bench or other method of working if the height and <br /> condition of the face pose a hazard . 1544(a) <br /> Electrical - General Requirements : <br /> * Only qualified persons can work on electrical equipment <br /> 2320 . 1 <br /> * Electrical installations must be maintained in safe <br /> condition . 2340 . 1 <br /> * Electrical equipment and wiring must be protected from <br /> mechanical damage and environmental deterioration . <br /> 2340 . 26(a) , 2340 . 11 <br /> Page - 19 <br />